Ragnvald Mathiesen

Publications

2021

Wang, Yeqing; Gao, Jianrong; Chao, Paul; Muyanja, Nancy S.; Mathiesen, Ragnvald; Shahani, Ashwin J.. (2021) In-situ evidence for impurity-induced formation of eutectic colonies in an interdendritic liquid. Materials Letters. volum 292.
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Liu, Xiangfa; Li, Yanjun. (2021) Growth kinetics of primary Si particles in hypereutectic Al-Si alloys under the influence of P inoculation: Experiments and modelling. Journal of Alloys and Compounds. volum 854.
Academic article
Zha, Min; Zhang, Hongmin; Jia, Hailong; Gao, Yipeng; Jin, Shenbao; Sha, Gang; Bjørge, Ruben; Mathiesen, Ragnvald; Roven, Hans Jørgen; Wang, Hui-Yuan; Li, Yanjun. (2021) Prominent role of multi-scale microstructural heterogeneities on superplastic deformation of a high solid solution Al–7Mg alloy. International journal of plasticity. volum 146.
Academic article

2020

Feng, Shikang; Liotti, Enzo; Lui, Andrew; Wilson, Matthew D.; Connolley, Thomas; Mathiesen, Ragnvald; Grant, P. S.. (2020) In-situ X-ray radiography of primary Fe-rich intermetallic compound formation. Acta Materialia. volum 196.
Academic article
Ormstrup, Jeppe; Østergaard, Emil V.; Detlefs, Carsten; Mathiesen, Ragnvald; Yildirim, Can; Kutsal, Mustafacan; Cook, Philip K.; Watier, Yves; Cosculluela, Carlos; Simons, Hugh. (2020) Imaging microstructural dynamics and strain fields in electro-active materials in situ with dark field x-ray microscopy. Review of Scientific Instruments. volum 91 (6).
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2020) In-situ X-radiographic study of nucleation and growth behaviour of primary silicon particles during solidification of a hypereutectic Al-Si alloy. Journal of Alloys and Compounds. volum 832.
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Liu, Xiangfa; Li, Yanjun. (2020) Revealing the nucleation kinetics of primary Si particles in hypereutectic Al-Si alloys under the influence of P inoculation. Journal of Materials Science. volum 55 (32).
Academic article

2019

Falch, Ken Vidar; Detlefs, Carsten; Christensen, Magnus Sebastian; Paganin, David; Mathiesen, Ragnvald. (2019) Experimental investigation of Gaussian random phase screen model for x-ray diffusers. Optics Express. volum 27 (15).
Academic article
Mirihanage, Wajira; Falch, Ken Vidar; Casari, Daniele; McFadden, Shaun; Browne, David J.; Snigireva, I.; Snigirev, Anatoly; Li, Yanjun; Mathiesen, Ragnvald. (2019) Non-steady 3D dendrite tip growth under diffusive and weakly convective conditions. Materialia. volum 5.
Academic article
Olofsson, Jakob; Salomonsson, Kent; Dahle, Arne K.; Mathiesen, Ragnvald. (2019) Three-dimensional study of nodule clustering and heterogeneous strain localization for tailored material properties in ductile iron. IOP Conference Series: Materials Science and Engineering. volum 529 (1).
Academic article
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2019) Revealing the Heterogeneous Nucleation and Growth Behaviour of Grains in Inoculated Aluminium Alloys During Solidification. The Minerals, Metals & Materials Series.
Academic article
Zhang, Qiuyuan; Polikarpov, Maxim; Nataliya, Klimova; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly. (2019) Investigation of glitches induced by single-crystal diamond compound refractive lenses based on crystal orientation. AIP Conference Proceedings. volum 2054 (1).
Academic article

2018

Aucott, Lee; Dong, Hongbiao; Mirihanage, Wajira; Atwood, Robert; Kidess, Anton; Gao, Shian; Wen, Shuwen; Marsden, John; Feng, Shuo; Tong, Mingming; Connolley, Thomas; Drakopoulos, Michael; Kleijn, Chris R.; Richardson, Ian M.; Browne, David J.; Mathiesen, Ragnvald; Atkinson, Helen V.. (2018) Revealing internal flow behaviour in arc welding and additive manufacturing of metals. Nature Communications. volum 9.
Academic article
Falch, Ken Vidar; Detlefs, Carsten; Snigirev, Anatoly; Mathiesen, Ragnvald. (2018) Analytical transmission cross-coefficients for pink beam X-ray microscopy based on compound refractive lenses. Ultramicroscopy. volum 184 (B).
Academic article
Falch, Ken Vidar; Lyubormiskiy, Mikhail; Casari, Daniele; Snigirev, Anatoly; Snigireva, Irina; Detlefs, Carsten; Di Michiel, Marco; Lyatun, Ivan; Mathiesen, Ragnvald. (2018) Zernike phase contrast in high-energy x-ray transmission microscopy based on refractive optics. Ultramicroscopy. volum 184 (A).
Academic article
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2018) Revealing the heterogeneous nucleation behavior of equiaxed grains of inoculated Al alloys during directional solidification. Acta Materialia. volum 149.
Academic article
Zha, Min; Yu, Zhi-Yuan; Qian, Feng; Wang, Huiyuan; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen. (2018) Achieving dispersed fine soft Bi particles and grain refinement in a hypermonotectic Al–Bi alloy by severe plastic deformation and annealing. Scripta Materialia. volum 155.
Academic article
Zhang, Qiuyuan; Polikarpov, Maxim; Klimova, Nataliya; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly. (2018) Investigation of `glitches' in the energy spectrum induced by single-crystal diamond compound X-ray refractive lenses. Journal of Synchrotron Radiation. volum 26.
Academic article

2017

Bjurenstedt, Anton; Casari, Daniele; Seifeddine, Salem; Mathiesen, Ragnvald; Dahle, Arne Kristian. (2017) In-situ study of morphology and growth of primary alpha-Al(FeMnCr)Si intermetallics in an Al-Si alloy. Acta Materialia. volum 130.
Academic article
Browne, David J.; García-Moreno, Francisco; Nguyen-Thi, Henri; Zimmermann, Gerhard; Kargl, Florian; Mathiesen, Ragnvald; Griesche, Axel; Minster, Olivier. (2017) Overview of in situ X-Ray studies of light alloy solidification in microgravity. The Minerals, Metals & Materials Series. volum Part XII.
Academic article
Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Sillekens, Wim H.; Mathiesen, Ragnvald. (2017) Morphological transition of α-Mg dendrites during near-isothermal solidification of a Mg-Nd-Gd-Zn-Zr casting alloy. The Minerals, Metals & Materials Series. volum Part F8.
Academic article
Falch, Ken Vidar; Casari, Daniele; Di Michiel, Marco; Detlefs, Carsten; Snigirev, Anatoly; Snigireva, Irina; Honkimäki, Veijo; Mathiesen, Ragnvald. (2017) In situ hard X-ray transmission microscopy for material science. Journal of Materials Science. volum 52 (6).
Academic article
Jia, Hailong; Bjørge, Ruben; Marthinsen, Knut; Mathiesen, Ragnvald; Li, Yanjun. (2017) Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP. Materials Science & Engineering: A. volum 703.
Academic article
Xu, Yijiang; Casari, Daniele; Du, Qiang; Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun. (2017) Heterogeneous nucleation and grain growth of inoculated aluminium alloys: An integrated study by in-situ X-radiography and numerical modelling. Acta Materialia. volum 140.
Academic article

2016

Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Sillekens, Wim H.; Mathiesen, Ragnvald. (2016) α-Mg primary phase formation and dendritic morphology transition in solidification of a Mg-Nd-Gd-Zn-Zr casting alloy. Acta Materialia. volum 116.
Academic article
Falch, Ken Vidar; Detlefs, Carsten; Di Michiel, Marco; Snigireva, Irina; Snigirev, Anatoly; Mathiesen, Ragnvald. (2016) Correcting lateral chromatic aberrations in non-monochromatic X-ray microscopy. Applied Physics Letters. volum 109 (5).
Academic article
Mathiesen, Ragnvald. (2016) Det europeiske superrøntgenanlegget ESRF under oppgradering. Fra Fysikkens Verden. volum 78.
Popular scientific article
Murphy, A.G.; Browne, DJ; Houltz, Y; Mathiesen, Ragnvald. (2016) In situ X-ray observations of gas porosity interactions with dendritic microstructures during solidification of Al-based alloys. IOP Conference Series: Materials Science and Engineering. volum 117 (1).
Academic article
Murphy, Andrew G.; Mathiesen, Ragnvald; Houltz, Ylva; Li, J.; Lockowandt, C; Henriksson, K; Melville, N; Browne, David J.. (2016) Direct observation of spatially isothermal equiaxed solidification of an Al–Cu alloy in microgravity onboard the MASER13 sounding rocket. Journal of Crystal Growth. volum 454.
Academic article
Murphy, Andrew G; Mathiesen, Ragnvald; Houltz, Ylva; Li, J; Lockowandt, C; Henriksson, K.J.; Zimmermann, Gerhard; Browne, David J.; Melville, N. (2016) XRMON-SOL: Isothermal equiaxed solidification of a grain refined Al-20 wt%Cu alloy. Journal of Crystal Growth. volum 440.
Academic article
Sillekens, W.H.; Casari, Daniele; Mirihanage, Wajira U.; Terzi, S; Mathiesen, Ragnvald; Salvo, L; Daudin, R; LHUISSIER, P; Guo, E; Lee, P. D.. (2016) The Use of In Situ X-ray Imaging Methods in the Research and Development of Magnesium-Based Grain-Refined and Nanocomposite Materials. JOM. volum 68 (12).
Academic article

2015

Li, Yanjun; Xu, Yijiang; Du, Qiang; Arnberg, Lars; Mathiesen, Ragnvald. (2015) Numerical modelling and in-situ radiographic study of the grain nucleation and growth of inoculated aluminum alloys. IOP Conference Series: Materials Science and Engineering. volum 84 (1).
Academic article
Mirihanage, Wajira; Di Michiel, Marco; Mathiesen, Ragnvald. (2015) Ultra-fast in-situ X-ray studies of evolving columnar dendrites in solidifying steel weld pools. IOP Conference Series: Materials Science and Engineering. volum 84 (1).
Academic article
Mo, Frode; Mathiesen, Ragnvald; Beukes, Jon Are; Vu, Khanh Minh. (2015) Rochelle salt - A structural reinvestigation with improved tools. I. the high-temperature paraelectric phase at 308 - K. IUCrJ. volum 2 (1).
Academic article
Murphy, A. G.; Mirihanage, Wajira; Browne, DJ; Mathiesen, Ragnvald. (2015) Equiaxed dendritic solidification and grain refiner potency characterised through in situ X-radiography. Acta Materialia. volum 95.
Academic article
Reiten, Andreas; Chernyshov, Dmitry; Mathiesen, Ragnvald. (2015) Nebula: Reconstruction and visualization of scattering data in reciprocal space. Journal of Applied Crystallography. volum 48.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2015) High ductility bulk nanostructured Al-Mg binary alloy processed by equal channel angular pressing and inter-pass annealing. Scripta Materialia. volum 105.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2015) Microstructure evolution and mechanical behavior of a binary Al-7Mg alloy processed by equal-channel angular pressing. Acta Materialia. volum 84.
Academic article

2014

Høydalsvik, Kristin; Fløystad, Jostein Bø; Zhao, Tiejun; Esmaeili, Morteza; Diaz, Ana; Andreasen, Jens Wenzel; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2014) In situ X-ray ptychography imaging of high-temperature CO2 acceptor particle agglomerates. Applied Physics Letters. volum 104 (24).
Academic article
Liotti, E; Lui, A; Vincent, R.; Kumar, S; Guo, Z; Connolley, T; Dolbnya, I.P.; Hart, M; Arnberg, Lars; Mathiesen, Ragnvald; Grant, P. S.. (2014) A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al-15Cu alloy. Acta Materialia. volum 70.
Academic article
Mirihanage, Wajira; Di Michel, Marco; Reiten, Andreas; Arnberg, Lars; Dong, Hongbiao; Mathiesen, Ragnvald. (2014) Time-resolved X-ray diffraction studies of solidification microstructure evolution in welding. Acta Materialia. volum 68.
Academic article
Mirihanage, Wajira; Falch, Ken Vidar; Snigireva, Irina; Snigirev, A; Li, Yanjun; Arnberg, Lars; Mathiesen, Ragnvald. (2014) Retrieval of three-dimensional spatial information from fast in situ two-dimensional synchrotron radiography of solidification microstructure evolution. Acta Materialia. volum 81.
Academic article
Nguyen-Thi, Henri; Reinhart, Guillaume; Salloum-Abou-Jaoudé, Georges; Browne, David; Murphy, Anthony G.; Houltz, Ylva; Li, J.; Voss, Daniela H.; Verga, Antonio; Mathiesen, Ragnvald; Zimmermann, Gerhard. (2014) XRMON-GF experiments devoted to the in situ X-ray radiographic observation of growth process in microgravity conditions. Microgravity, science and technology. volum 26 (1).
Academic article
Salloum-Abou-Jaoude, G; Nguyen-Thi, H; Reinhart, G; Mathiesen, Ragnvald; Zimmermann, G; Voss, D. (2014) A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al–15Cu alloy. Materials Science Forum. volum 790-791.
Academic article
Salloum-Abou-Jaoudé, Georges; Nguyen-Thi, Henri; Reinhart, Guillaume; Mathiesen, Ragnvald; Zimmermann, Gerhard; Voss, Daniela H.. (2014) Characterization of Motion of Dendrite Fragment by X-Ray Radiography on Earth and under Microgravity Environment. Materials Science Forum. volum 790-791.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Baumgart, Christine; Roven, Hans Jørgen. (2014) Influence on Mg content, grain size and strain rate on mechanical properties and DSA behaviour of Al-Mg alloys processed by ECAP and annealing. Materials Science Forum. volum 794-796.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Achieve high ductility and strength in an Al-Mg alloy by severe plastic deformation combined with inter-pass annealing. Materials Science & Engineering: A. volum 598.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Microstructure, hardness evolution and thermal stability of binary Al-7Mg alloy processed by ECAP with intermediate annealing. Transactions of Nonferrous Metals Society of China. volum 24 (7).
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans. (2014) Dispersion of soft Bi particles and grain refinement of matrix in an Al-Bi alloy by equal channel angular pressing. Journal of Alloys and Compounds. volum 605.
Letter to the editor

2013

Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas; Johnsen, Roy; Krøkje, Åse. (2013) Enabling technologies at NTNU; materials science and engineering. 2013.
Report
Liotti, E; Lui, A; Vincent, R.; Kumar, S.; Guo, Z; Connolley, T; Hart, M; Arnberg, Lars; Mathiesen, Ragnvald; Grant, P.S.. (2013) A Synchrotron X-ray Radiography Investigation of Induced Dendrite Fragmentation in Al-15wt%Cu. Materials Science Forum. volum 765.
Academic article
Murphy, A. G.; Browne, DJ; Mirihanage, Wajira; Mathiesen, Ragnvald. (2013) Combined in situ X-ray radiographic observations and post-solidification metallographic characterisation of eutectic transformations in Al-Cu alloy systems. Acta Materialia. volum 61 (12).
Academic article
Nguyen-Thi, H; Reinhart, G; Abou Jaoude, G.S.; Mathiesen, Ragnvald; Zimmermann, Gerhard; Houltz, Y; Voss, D; Verga, A; Browne, DJ; Murphy, A. G.. (2013) XRMON-GF: A novel facility for solidification of metallic alloys with in situ and time-resolved X-ray radiographic characterization in microgravity conditions. Journal of Crystal Growth. volum 374.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2013) Annealing response of binary Al-7Mg alloy deformed by equal channel angular pressing. Materials Science & Engineering: A. volum 586.
Academic article

2012

Mathiesen, Ragnvald; Arnberg, Lars; Nguyen-Thi, H; Billia, B. (2012) In situ X-ray video microscopy as a tool in solidification science. JOM. volum 64 (1).
Academic article
Mirihanage, Wajira; Arnberg, Lars; Mathiesen, Ragnvald. (2012) In-situ observation of transient columnar dendrite growth in the presence of thermo-solutal convection. IOP Conference Series: Materials Science and Engineering. volum 33.
Academic article
Nguyen-Thi, H; Salvo, L; Mathiesen, Ragnvald; Arnberg, Lars; Billia, B; Suery, M; Reinhart, G. (2012) On the interest of synchrotron X-ray imaging for the study of solidification in metallic alloys. Comptes rendus. Physique. volum 13 (3).
Academic article

2011

Anawati, Ms; Diplas, Spyridon; Holme, Børge; Solberg, Jan Ketil; Mathiesen, Ragnvald; Walmsley, John; Nisancioglu, Kemal. (2011) Surface Characterization of Heat Treated AlPbCu Model Alloys. Journal of the Electrochemical Society. volum 158 (6).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Meier, Vivienne; Schaffer, Paul; Snigireva, Irina; Snigirev, Anatoly; Dahle, Arne Kristian. (2011) X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu. Metallurgical and Materials Transactions A. volum 42A (1).
Academic article
Nguyen-Thi, H; Bogno, A; Reinhart, G; Billia, B; Mathiesen, Ragnvald; Zimmermann, Gerhard; Houltz, Y; Loth, K; Voss, D; Verga, A; de Pascale, F. (2011) Investigation of gravity effects on solidification of binary alloys with in situ X-ray radiography on earth and in microgravity environment. Journal of Physics: Conference Series (JPCS). volum 327 (012012).
Academic article
Rakete, Christoph; Baumbach, C; Goldschmidt, A; Samberg, D; Schroer, C.G.; Breede, F; Stenzel, C; Zimmermann, Gerhard; Pickmann, C; Houltz, Y; Lockowandt, C; Svenonius, O; Wiklund, P; Mathiesen, Ragnvald. (2011) Compact x-ray microradiograph for in situ imaging of solidification processes: Bringing in situ x-ray micro-imaging from the synchrotron to the laboratory. Review of Scientific Instruments. volum 82 (10).
Academic article

2010

Delaleau, Pierre Patrick; Beckermann, Christoph; Mathiesen, Ragnvald; Arnberg, Lars. (2010) Mesoscopic Simulation of Dendritic Growth Observed in X-ray Video Microscopy During Directional Solidification of Al-Cu Alloys. ISIJ International. volum 50 (12).
Academic article
Li, Yanjun; Chen, Yongjun; Walmsley, John; Dumoulin, Stephane; Mathiesen, Ragnvald; Roven, Hans Jørgen. (2010) Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing. Scripta Materialia. volum 62 (7).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Snigirev, Anatoly; Snigireva, Irina; Dahle, Arne Kristian. (2010) X-Ray Video Microscopy Studies of Irregular Eutectic Solidification Microstructures in Al-Si-Cu Alloys. ISIJ International. volum 50 (12).
Academic article
McFadden, Shaun; Schaffer, Paul; Mathiesen, Ragnvald; Browne, David. (2010) Analysis of an Equiaxed Dendrite Growth Model with Comparisons to In-Situ Results of Equiaxed Dendritic Growth in an Al-Ge Alloy. Materials Science Forum. volum 654-656.
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2010) In situ investigations of liquid-liquid phase separation in hypermonotectic alloys. Materials Science Forum. volum 649.
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2010) In-situ Investigation of Liquid-Liquid Phase Separation in Hypermonotectic Alloys. Materials Science Forum. volum 649.
Academic article
Walmsley, John; Albertsen, Jorun Zahl; Friis, Jesper; Mathiesen, Ragnvald. (2010) The evolution and oxidation of carbides in an Alloy 601 exposed to long term high temperature corrosion conditions. Corrosion Science. volum 52 (12).
Academic article
Zimmermann, Gerhard; Hecht, Ulrike; Mathes, Michael; Mathiesen, Ragnvald. (2010) Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al-Cu-Ag alloys. International Journal of Materials Research - Zeitschrift für Metallkunde. volum 101 (12).
Academic article

2009

Delaleau, Pierre; Mathiesen, Ragnvald; Schaffer, Paul; Arnberg, Lars. (2009) Impact of buoyancy on the growth of equiaxed grains in Al-Cu. International Journal of Cast Metals Research. volum 22 (1-4).
Academic article
Ruvalcaba, Demian; Eskin, Dmitry; Mathiesen, Ragnvald; Arnberg, Lars; Katgerman, Laurens. (2009) Influence of dendrite arrangement on coarsening during solidification of high-solute Al alloys. International Journal of Cast Metals Research. volum 22 (1-4).
Academic article
Ruvalcaba, Demian; Mathiesen, Ragnvald; Eskin, Dmitry; Arnberg, Lars; Katgerman, Laurens. (2009) In-situ analysis of coarsening during directional solidification experiments in high-solute aluminium alloys. Metallurgical and Materials Transactions B. volum 40 (3).
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2009) L2 droplet interaction with alpha-Al during solidification of hypermonotectic Al–8 wt.% Bi alloys. Acta Materialia. volum 57 (10).
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2009) Liquid decomposition, droplet coagulation and droplet-interface interactions in hypermonotectic Al-Bi alloys. Transactions of the Indian Institute of Metals. volum 62 (4-5).
Academic article
Tucho, Wakshum Mekonnen; Venvik, Hilde Johnsen; Walmsley, John C; Stange, M; Ramachandran, Amutha; Mathiesen, Ragnvald; Borg, Anne; Bredesen, R; Holmestad, Randi. (2009) Microstructural studies of self-supported (1.5-10 mu m) Pd/23 wt% Ag hydrogen separation membranes subjected to different heat treatments. Journal of Materials Science. volum 44 (16).
Academic article

2008

Albertsen, Jorun Zahl; Grong, Øystein; Walmsley, John C; Mathiesen, Ragnvald; Beek, W.J.. (2008) A Model for High-Temperature Pitting Corrosion in Nickel-Based Alloys Involving Internal Precipitation of Carbides, Oxides and Graphite. Metallurgical and Materials Transactions A. volum 39.
Academic article
Forbord, Børge; Mathiesen, Ragnvald; Mårdalen, Jostein; Furu, Trond; Lange, Hans Iver. (2008) Elastic strain and texture evolution during tensile testing of peak-hardened Al-Mg-Si-profiles. Materials Science & Engineering: A. volum 479 (1-2).
Academic article
Larsen, Magnus Hurlen; Walmsley, John C; Lunder, Otto; Mathiesen, Ragnvald; Nisancioglu, Kemal. (2008) Intergranular corrosion of copper-containing AA6xxx AlMgSi aluminum alloys. Journal of the Electrochemical Society. volum 155 (11).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars. (2008) X-Ray Imaging of Solidification Processes and Microstructure Evolution. ASM Handbook, volume 15, Casting.
Academic chapter/article/Conference paper
Ratke, Lorenz; Gandin, Charles Andre; Mathiesen, Ragnvald; Rappaz, Michel; Rex, Stephan. (2008) Materials Solidification Physics in Space. EurophysicsNews. volum 39 (5).
Article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars; Di Sabatino, Marisa; Snigirev, Anatoly. (2008) In situ investigation of spinodal decomposition in hypermonotectic Al–Bi and Al–Bi–Zn alloys. New Journal of Physics. volum 10.
Academic article

2007

Walmsley, John C; Sævik, Øystein; Graver, Brit Kathrine F; Mathiesen, Ragnvald; Yu, Yingda; Nisancioglu, Kemal. (2007) Nature of Segregated Lead on Electrochemically Active AlPb Alloy. Journal of the Electrochemical Society. volum 154 (1).
Academic article

2005

Mathiesen, Ragnvald; Arnberg, Lars. (2005) Stray crystal formation in Al-20wt.% Cu studied by synchrotron X-ray video microscopy. Materials Science & Engineering: A. volum 413-414.
Academic article
Thorkildsen, Gunnar; Weckert, Edgar; Mo, Frode; Larsen, Helge Bøvik; Mathiesen, Ragnvald. (2005) Three-beam resonant X-ray diffraction in germanium - Laue transmission cases. Acta Crystallographica Section A: Foundations of Crystallography. volum 61.
Academic article

2004

Birkedal, H; Madsen, Dennis; Mathiesen, Ragnvald; Knudsen, K; Weber, HP; Pattison, P; Schwarzenbach, D; Mathiesen, r*. (2004) The charge density of urea from synchrotron diffraction data. Acta Crystallographica Section A: Foundations of Crystallography. volum 60.
Academic article

1998

Mathiesen, Ragnvald; Mo, Frode; Eikenes, Anders; Nyborg, Tanja; Larsen, Helge B.; Authier, Andre. (1998) Existence of Two Crystal Structures of the Complex alpha-D-Glucose NaCl H_2O (2:1:1) Verified by Three-Beam Diffraction Experiments. ?. volum A54.
Academic article

Journal publications

Wang, Yeqing; Gao, Jianrong; Chao, Paul; Muyanja, Nancy S.; Mathiesen, Ragnvald; Shahani, Ashwin J.. (2021) In-situ evidence for impurity-induced formation of eutectic colonies in an interdendritic liquid. Materials Letters. volum 292.
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Liu, Xiangfa; Li, Yanjun. (2021) Growth kinetics of primary Si particles in hypereutectic Al-Si alloys under the influence of P inoculation: Experiments and modelling. Journal of Alloys and Compounds. volum 854.
Academic article
Zha, Min; Zhang, Hongmin; Jia, Hailong; Gao, Yipeng; Jin, Shenbao; Sha, Gang; Bjørge, Ruben; Mathiesen, Ragnvald; Roven, Hans Jørgen; Wang, Hui-Yuan; Li, Yanjun. (2021) Prominent role of multi-scale microstructural heterogeneities on superplastic deformation of a high solid solution Al–7Mg alloy. International journal of plasticity. volum 146.
Academic article
Feng, Shikang; Liotti, Enzo; Lui, Andrew; Wilson, Matthew D.; Connolley, Thomas; Mathiesen, Ragnvald; Grant, P. S.. (2020) In-situ X-ray radiography of primary Fe-rich intermetallic compound formation. Acta Materialia. volum 196.
Academic article
Ormstrup, Jeppe; Østergaard, Emil V.; Detlefs, Carsten; Mathiesen, Ragnvald; Yildirim, Can; Kutsal, Mustafacan; Cook, Philip K.; Watier, Yves; Cosculluela, Carlos; Simons, Hugh. (2020) Imaging microstructural dynamics and strain fields in electro-active materials in situ with dark field x-ray microscopy. Review of Scientific Instruments. volum 91 (6).
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2020) In-situ X-radiographic study of nucleation and growth behaviour of primary silicon particles during solidification of a hypereutectic Al-Si alloy. Journal of Alloys and Compounds. volum 832.
Academic article
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Liu, Xiangfa; Li, Yanjun. (2020) Revealing the nucleation kinetics of primary Si particles in hypereutectic Al-Si alloys under the influence of P inoculation. Journal of Materials Science. volum 55 (32).
Academic article
Falch, Ken Vidar; Detlefs, Carsten; Christensen, Magnus Sebastian; Paganin, David; Mathiesen, Ragnvald. (2019) Experimental investigation of Gaussian random phase screen model for x-ray diffusers. Optics Express. volum 27 (15).
Academic article
Mirihanage, Wajira; Falch, Ken Vidar; Casari, Daniele; McFadden, Shaun; Browne, David J.; Snigireva, I.; Snigirev, Anatoly; Li, Yanjun; Mathiesen, Ragnvald. (2019) Non-steady 3D dendrite tip growth under diffusive and weakly convective conditions. Materialia. volum 5.
Academic article
Olofsson, Jakob; Salomonsson, Kent; Dahle, Arne K.; Mathiesen, Ragnvald. (2019) Three-dimensional study of nodule clustering and heterogeneous strain localization for tailored material properties in ductile iron. IOP Conference Series: Materials Science and Engineering. volum 529 (1).
Academic article
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2019) Revealing the Heterogeneous Nucleation and Growth Behaviour of Grains in Inoculated Aluminium Alloys During Solidification. The Minerals, Metals & Materials Series.
Academic article
Zhang, Qiuyuan; Polikarpov, Maxim; Nataliya, Klimova; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly. (2019) Investigation of glitches induced by single-crystal diamond compound refractive lenses based on crystal orientation. AIP Conference Proceedings. volum 2054 (1).
Academic article
Aucott, Lee; Dong, Hongbiao; Mirihanage, Wajira; Atwood, Robert; Kidess, Anton; Gao, Shian; Wen, Shuwen; Marsden, John; Feng, Shuo; Tong, Mingming; Connolley, Thomas; Drakopoulos, Michael; Kleijn, Chris R.; Richardson, Ian M.; Browne, David J.; Mathiesen, Ragnvald; Atkinson, Helen V.. (2018) Revealing internal flow behaviour in arc welding and additive manufacturing of metals. Nature Communications. volum 9.
Academic article
Falch, Ken Vidar; Detlefs, Carsten; Snigirev, Anatoly; Mathiesen, Ragnvald. (2018) Analytical transmission cross-coefficients for pink beam X-ray microscopy based on compound refractive lenses. Ultramicroscopy. volum 184 (B).
Academic article
Falch, Ken Vidar; Lyubormiskiy, Mikhail; Casari, Daniele; Snigirev, Anatoly; Snigireva, Irina; Detlefs, Carsten; Di Michiel, Marco; Lyatun, Ivan; Mathiesen, Ragnvald. (2018) Zernike phase contrast in high-energy x-ray transmission microscopy based on refractive optics. Ultramicroscopy. volum 184 (A).
Academic article
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun. (2018) Revealing the heterogeneous nucleation behavior of equiaxed grains of inoculated Al alloys during directional solidification. Acta Materialia. volum 149.
Academic article
Zha, Min; Yu, Zhi-Yuan; Qian, Feng; Wang, Huiyuan; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen. (2018) Achieving dispersed fine soft Bi particles and grain refinement in a hypermonotectic Al–Bi alloy by severe plastic deformation and annealing. Scripta Materialia. volum 155.
Academic article
Zhang, Qiuyuan; Polikarpov, Maxim; Klimova, Nataliya; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Thorkildsen, Gunnar; Snigireva, Irina; Snigirev, Anatoly. (2018) Investigation of `glitches' in the energy spectrum induced by single-crystal diamond compound X-ray refractive lenses. Journal of Synchrotron Radiation. volum 26.
Academic article
Bjurenstedt, Anton; Casari, Daniele; Seifeddine, Salem; Mathiesen, Ragnvald; Dahle, Arne Kristian. (2017) In-situ study of morphology and growth of primary alpha-Al(FeMnCr)Si intermetallics in an Al-Si alloy. Acta Materialia. volum 130.
Academic article
Browne, David J.; García-Moreno, Francisco; Nguyen-Thi, Henri; Zimmermann, Gerhard; Kargl, Florian; Mathiesen, Ragnvald; Griesche, Axel; Minster, Olivier. (2017) Overview of in situ X-Ray studies of light alloy solidification in microgravity. The Minerals, Metals & Materials Series. volum Part XII.
Academic article
Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Sillekens, Wim H.; Mathiesen, Ragnvald. (2017) Morphological transition of α-Mg dendrites during near-isothermal solidification of a Mg-Nd-Gd-Zn-Zr casting alloy. The Minerals, Metals & Materials Series. volum Part F8.
Academic article
Falch, Ken Vidar; Casari, Daniele; Di Michiel, Marco; Detlefs, Carsten; Snigirev, Anatoly; Snigireva, Irina; Honkimäki, Veijo; Mathiesen, Ragnvald. (2017) In situ hard X-ray transmission microscopy for material science. Journal of Materials Science. volum 52 (6).
Academic article
Jia, Hailong; Bjørge, Ruben; Marthinsen, Knut; Mathiesen, Ragnvald; Li, Yanjun. (2017) Soft particles assisted grain refinement and strengthening of an Al-Bi-Zn alloy subjected to ECAP. Materials Science & Engineering: A. volum 703.
Academic article
Xu, Yijiang; Casari, Daniele; Du, Qiang; Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun. (2017) Heterogeneous nucleation and grain growth of inoculated aluminium alloys: An integrated study by in-situ X-radiography and numerical modelling. Acta Materialia. volum 140.
Academic article
Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Sillekens, Wim H.; Mathiesen, Ragnvald. (2016) α-Mg primary phase formation and dendritic morphology transition in solidification of a Mg-Nd-Gd-Zn-Zr casting alloy. Acta Materialia. volum 116.
Academic article
Falch, Ken Vidar; Detlefs, Carsten; Di Michiel, Marco; Snigireva, Irina; Snigirev, Anatoly; Mathiesen, Ragnvald. (2016) Correcting lateral chromatic aberrations in non-monochromatic X-ray microscopy. Applied Physics Letters. volum 109 (5).
Academic article
Mathiesen, Ragnvald. (2016) Det europeiske superrøntgenanlegget ESRF under oppgradering. Fra Fysikkens Verden. volum 78.
Popular scientific article
Murphy, A.G.; Browne, DJ; Houltz, Y; Mathiesen, Ragnvald. (2016) In situ X-ray observations of gas porosity interactions with dendritic microstructures during solidification of Al-based alloys. IOP Conference Series: Materials Science and Engineering. volum 117 (1).
Academic article
Murphy, Andrew G.; Mathiesen, Ragnvald; Houltz, Ylva; Li, J.; Lockowandt, C; Henriksson, K; Melville, N; Browne, David J.. (2016) Direct observation of spatially isothermal equiaxed solidification of an Al–Cu alloy in microgravity onboard the MASER13 sounding rocket. Journal of Crystal Growth. volum 454.
Academic article
Murphy, Andrew G; Mathiesen, Ragnvald; Houltz, Ylva; Li, J; Lockowandt, C; Henriksson, K.J.; Zimmermann, Gerhard; Browne, David J.; Melville, N. (2016) XRMON-SOL: Isothermal equiaxed solidification of a grain refined Al-20 wt%Cu alloy. Journal of Crystal Growth. volum 440.
Academic article
Sillekens, W.H.; Casari, Daniele; Mirihanage, Wajira U.; Terzi, S; Mathiesen, Ragnvald; Salvo, L; Daudin, R; LHUISSIER, P; Guo, E; Lee, P. D.. (2016) The Use of In Situ X-ray Imaging Methods in the Research and Development of Magnesium-Based Grain-Refined and Nanocomposite Materials. JOM. volum 68 (12).
Academic article
Li, Yanjun; Xu, Yijiang; Du, Qiang; Arnberg, Lars; Mathiesen, Ragnvald. (2015) Numerical modelling and in-situ radiographic study of the grain nucleation and growth of inoculated aluminum alloys. IOP Conference Series: Materials Science and Engineering. volum 84 (1).
Academic article
Mirihanage, Wajira; Di Michiel, Marco; Mathiesen, Ragnvald. (2015) Ultra-fast in-situ X-ray studies of evolving columnar dendrites in solidifying steel weld pools. IOP Conference Series: Materials Science and Engineering. volum 84 (1).
Academic article
Mo, Frode; Mathiesen, Ragnvald; Beukes, Jon Are; Vu, Khanh Minh. (2015) Rochelle salt - A structural reinvestigation with improved tools. I. the high-temperature paraelectric phase at 308 - K. IUCrJ. volum 2 (1).
Academic article
Murphy, A. G.; Mirihanage, Wajira; Browne, DJ; Mathiesen, Ragnvald. (2015) Equiaxed dendritic solidification and grain refiner potency characterised through in situ X-radiography. Acta Materialia. volum 95.
Academic article
Reiten, Andreas; Chernyshov, Dmitry; Mathiesen, Ragnvald. (2015) Nebula: Reconstruction and visualization of scattering data in reciprocal space. Journal of Applied Crystallography. volum 48.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2015) High ductility bulk nanostructured Al-Mg binary alloy processed by equal channel angular pressing and inter-pass annealing. Scripta Materialia. volum 105.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2015) Microstructure evolution and mechanical behavior of a binary Al-7Mg alloy processed by equal-channel angular pressing. Acta Materialia. volum 84.
Academic article
Høydalsvik, Kristin; Fløystad, Jostein Bø; Zhao, Tiejun; Esmaeili, Morteza; Diaz, Ana; Andreasen, Jens Wenzel; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2014) In situ X-ray ptychography imaging of high-temperature CO2 acceptor particle agglomerates. Applied Physics Letters. volum 104 (24).
Academic article
Liotti, E; Lui, A; Vincent, R.; Kumar, S; Guo, Z; Connolley, T; Dolbnya, I.P.; Hart, M; Arnberg, Lars; Mathiesen, Ragnvald; Grant, P. S.. (2014) A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al-15Cu alloy. Acta Materialia. volum 70.
Academic article
Mirihanage, Wajira; Di Michel, Marco; Reiten, Andreas; Arnberg, Lars; Dong, Hongbiao; Mathiesen, Ragnvald. (2014) Time-resolved X-ray diffraction studies of solidification microstructure evolution in welding. Acta Materialia. volum 68.
Academic article
Mirihanage, Wajira; Falch, Ken Vidar; Snigireva, Irina; Snigirev, A; Li, Yanjun; Arnberg, Lars; Mathiesen, Ragnvald. (2014) Retrieval of three-dimensional spatial information from fast in situ two-dimensional synchrotron radiography of solidification microstructure evolution. Acta Materialia. volum 81.
Academic article
Nguyen-Thi, Henri; Reinhart, Guillaume; Salloum-Abou-Jaoudé, Georges; Browne, David; Murphy, Anthony G.; Houltz, Ylva; Li, J.; Voss, Daniela H.; Verga, Antonio; Mathiesen, Ragnvald; Zimmermann, Gerhard. (2014) XRMON-GF experiments devoted to the in situ X-ray radiographic observation of growth process in microgravity conditions. Microgravity, science and technology. volum 26 (1).
Academic article
Salloum-Abou-Jaoude, G; Nguyen-Thi, H; Reinhart, G; Mathiesen, Ragnvald; Zimmermann, G; Voss, D. (2014) A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al–15Cu alloy. Materials Science Forum. volum 790-791.
Academic article
Salloum-Abou-Jaoudé, Georges; Nguyen-Thi, Henri; Reinhart, Guillaume; Mathiesen, Ragnvald; Zimmermann, Gerhard; Voss, Daniela H.. (2014) Characterization of Motion of Dendrite Fragment by X-Ray Radiography on Earth and under Microgravity Environment. Materials Science Forum. volum 790-791.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Baumgart, Christine; Roven, Hans Jørgen. (2014) Influence on Mg content, grain size and strain rate on mechanical properties and DSA behaviour of Al-Mg alloys processed by ECAP and annealing. Materials Science Forum. volum 794-796.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Achieve high ductility and strength in an Al-Mg alloy by severe plastic deformation combined with inter-pass annealing. Materials Science & Engineering: A. volum 598.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Microstructure, hardness evolution and thermal stability of binary Al-7Mg alloy processed by ECAP with intermediate annealing. Transactions of Nonferrous Metals Society of China. volum 24 (7).
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans. (2014) Dispersion of soft Bi particles and grain refinement of matrix in an Al-Bi alloy by equal channel angular pressing. Journal of Alloys and Compounds. volum 605.
Letter to the editor
Liotti, E; Lui, A; Vincent, R.; Kumar, S.; Guo, Z; Connolley, T; Hart, M; Arnberg, Lars; Mathiesen, Ragnvald; Grant, P.S.. (2013) A Synchrotron X-ray Radiography Investigation of Induced Dendrite Fragmentation in Al-15wt%Cu. Materials Science Forum. volum 765.
Academic article
Murphy, A. G.; Browne, DJ; Mirihanage, Wajira; Mathiesen, Ragnvald. (2013) Combined in situ X-ray radiographic observations and post-solidification metallographic characterisation of eutectic transformations in Al-Cu alloy systems. Acta Materialia. volum 61 (12).
Academic article
Nguyen-Thi, H; Reinhart, G; Abou Jaoude, G.S.; Mathiesen, Ragnvald; Zimmermann, Gerhard; Houltz, Y; Voss, D; Verga, A; Browne, DJ; Murphy, A. G.. (2013) XRMON-GF: A novel facility for solidification of metallic alloys with in situ and time-resolved X-ray radiographic characterization in microgravity conditions. Journal of Crystal Growth. volum 374.
Academic article
Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2013) Annealing response of binary Al-7Mg alloy deformed by equal channel angular pressing. Materials Science & Engineering: A. volum 586.
Academic article
Mathiesen, Ragnvald; Arnberg, Lars; Nguyen-Thi, H; Billia, B. (2012) In situ X-ray video microscopy as a tool in solidification science. JOM. volum 64 (1).
Academic article
Mirihanage, Wajira; Arnberg, Lars; Mathiesen, Ragnvald. (2012) In-situ observation of transient columnar dendrite growth in the presence of thermo-solutal convection. IOP Conference Series: Materials Science and Engineering. volum 33.
Academic article
Nguyen-Thi, H; Salvo, L; Mathiesen, Ragnvald; Arnberg, Lars; Billia, B; Suery, M; Reinhart, G. (2012) On the interest of synchrotron X-ray imaging for the study of solidification in metallic alloys. Comptes rendus. Physique. volum 13 (3).
Academic article
Anawati, Ms; Diplas, Spyridon; Holme, Børge; Solberg, Jan Ketil; Mathiesen, Ragnvald; Walmsley, John; Nisancioglu, Kemal. (2011) Surface Characterization of Heat Treated AlPbCu Model Alloys. Journal of the Electrochemical Society. volum 158 (6).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Meier, Vivienne; Schaffer, Paul; Snigireva, Irina; Snigirev, Anatoly; Dahle, Arne Kristian. (2011) X-Ray Videomicroscopy Studies of Eutectic Al-Si Solidification in Al-Si-Cu. Metallurgical and Materials Transactions A. volum 42A (1).
Academic article
Nguyen-Thi, H; Bogno, A; Reinhart, G; Billia, B; Mathiesen, Ragnvald; Zimmermann, Gerhard; Houltz, Y; Loth, K; Voss, D; Verga, A; de Pascale, F. (2011) Investigation of gravity effects on solidification of binary alloys with in situ X-ray radiography on earth and in microgravity environment. Journal of Physics: Conference Series (JPCS). volum 327 (012012).
Academic article
Rakete, Christoph; Baumbach, C; Goldschmidt, A; Samberg, D; Schroer, C.G.; Breede, F; Stenzel, C; Zimmermann, Gerhard; Pickmann, C; Houltz, Y; Lockowandt, C; Svenonius, O; Wiklund, P; Mathiesen, Ragnvald. (2011) Compact x-ray microradiograph for in situ imaging of solidification processes: Bringing in situ x-ray micro-imaging from the synchrotron to the laboratory. Review of Scientific Instruments. volum 82 (10).
Academic article
Delaleau, Pierre Patrick; Beckermann, Christoph; Mathiesen, Ragnvald; Arnberg, Lars. (2010) Mesoscopic Simulation of Dendritic Growth Observed in X-ray Video Microscopy During Directional Solidification of Al-Cu Alloys. ISIJ International. volum 50 (12).
Academic article
Li, Yanjun; Chen, Yongjun; Walmsley, John; Dumoulin, Stephane; Mathiesen, Ragnvald; Roven, Hans Jørgen. (2010) Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing. Scripta Materialia. volum 62 (7).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Snigirev, Anatoly; Snigireva, Irina; Dahle, Arne Kristian. (2010) X-Ray Video Microscopy Studies of Irregular Eutectic Solidification Microstructures in Al-Si-Cu Alloys. ISIJ International. volum 50 (12).
Academic article
McFadden, Shaun; Schaffer, Paul; Mathiesen, Ragnvald; Browne, David. (2010) Analysis of an Equiaxed Dendrite Growth Model with Comparisons to In-Situ Results of Equiaxed Dendritic Growth in an Al-Ge Alloy. Materials Science Forum. volum 654-656.
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2010) In situ investigations of liquid-liquid phase separation in hypermonotectic alloys. Materials Science Forum. volum 649.
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2010) In-situ Investigation of Liquid-Liquid Phase Separation in Hypermonotectic Alloys. Materials Science Forum. volum 649.
Academic article
Walmsley, John; Albertsen, Jorun Zahl; Friis, Jesper; Mathiesen, Ragnvald. (2010) The evolution and oxidation of carbides in an Alloy 601 exposed to long term high temperature corrosion conditions. Corrosion Science. volum 52 (12).
Academic article
Zimmermann, Gerhard; Hecht, Ulrike; Mathes, Michael; Mathiesen, Ragnvald. (2010) Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al-Cu-Ag alloys. International Journal of Materials Research - Zeitschrift für Metallkunde. volum 101 (12).
Academic article
Delaleau, Pierre; Mathiesen, Ragnvald; Schaffer, Paul; Arnberg, Lars. (2009) Impact of buoyancy on the growth of equiaxed grains in Al-Cu. International Journal of Cast Metals Research. volum 22 (1-4).
Academic article
Ruvalcaba, Demian; Eskin, Dmitry; Mathiesen, Ragnvald; Arnberg, Lars; Katgerman, Laurens. (2009) Influence of dendrite arrangement on coarsening during solidification of high-solute Al alloys. International Journal of Cast Metals Research. volum 22 (1-4).
Academic article
Ruvalcaba, Demian; Mathiesen, Ragnvald; Eskin, Dmitry; Arnberg, Lars; Katgerman, Laurens. (2009) In-situ analysis of coarsening during directional solidification experiments in high-solute aluminium alloys. Metallurgical and Materials Transactions B. volum 40 (3).
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2009) L2 droplet interaction with alpha-Al during solidification of hypermonotectic Al–8 wt.% Bi alloys. Acta Materialia. volum 57 (10).
Academic article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars. (2009) Liquid decomposition, droplet coagulation and droplet-interface interactions in hypermonotectic Al-Bi alloys. Transactions of the Indian Institute of Metals. volum 62 (4-5).
Academic article
Tucho, Wakshum Mekonnen; Venvik, Hilde Johnsen; Walmsley, John C; Stange, M; Ramachandran, Amutha; Mathiesen, Ragnvald; Borg, Anne; Bredesen, R; Holmestad, Randi. (2009) Microstructural studies of self-supported (1.5-10 mu m) Pd/23 wt% Ag hydrogen separation membranes subjected to different heat treatments. Journal of Materials Science. volum 44 (16).
Academic article
Albertsen, Jorun Zahl; Grong, Øystein; Walmsley, John C; Mathiesen, Ragnvald; Beek, W.J.. (2008) A Model for High-Temperature Pitting Corrosion in Nickel-Based Alloys Involving Internal Precipitation of Carbides, Oxides and Graphite. Metallurgical and Materials Transactions A. volum 39.
Academic article
Forbord, Børge; Mathiesen, Ragnvald; Mårdalen, Jostein; Furu, Trond; Lange, Hans Iver. (2008) Elastic strain and texture evolution during tensile testing of peak-hardened Al-Mg-Si-profiles. Materials Science & Engineering: A. volum 479 (1-2).
Academic article
Larsen, Magnus Hurlen; Walmsley, John C; Lunder, Otto; Mathiesen, Ragnvald; Nisancioglu, Kemal. (2008) Intergranular corrosion of copper-containing AA6xxx AlMgSi aluminum alloys. Journal of the Electrochemical Society. volum 155 (11).
Academic article
Ratke, Lorenz; Gandin, Charles Andre; Mathiesen, Ragnvald; Rappaz, Michel; Rex, Stephan. (2008) Materials Solidification Physics in Space. EurophysicsNews. volum 39 (5).
Article
Schaffer, Paul; Mathiesen, Ragnvald; Arnberg, Lars; Di Sabatino, Marisa; Snigirev, Anatoly. (2008) In situ investigation of spinodal decomposition in hypermonotectic Al–Bi and Al–Bi–Zn alloys. New Journal of Physics. volum 10.
Academic article
Walmsley, John C; Sævik, Øystein; Graver, Brit Kathrine F; Mathiesen, Ragnvald; Yu, Yingda; Nisancioglu, Kemal. (2007) Nature of Segregated Lead on Electrochemically Active AlPb Alloy. Journal of the Electrochemical Society. volum 154 (1).
Academic article
Mathiesen, Ragnvald; Arnberg, Lars. (2005) Stray crystal formation in Al-20wt.% Cu studied by synchrotron X-ray video microscopy. Materials Science & Engineering: A. volum 413-414.
Academic article
Thorkildsen, Gunnar; Weckert, Edgar; Mo, Frode; Larsen, Helge Bøvik; Mathiesen, Ragnvald. (2005) Three-beam resonant X-ray diffraction in germanium - Laue transmission cases. Acta Crystallographica Section A: Foundations of Crystallography. volum 61.
Academic article
Birkedal, H; Madsen, Dennis; Mathiesen, Ragnvald; Knudsen, K; Weber, HP; Pattison, P; Schwarzenbach, D; Mathiesen, r*. (2004) The charge density of urea from synchrotron diffraction data. Acta Crystallographica Section A: Foundations of Crystallography. volum 60.
Academic article
Mathiesen, Ragnvald; Mo, Frode; Eikenes, Anders; Nyborg, Tanja; Larsen, Helge B.; Authier, Andre. (1998) Existence of Two Crystal Structures of the Complex alpha-D-Glucose NaCl H_2O (2:1:1) Verified by Three-Beam Diffraction Experiments. ?. volum A54.
Academic article

Part of book/report

Mathiesen, Ragnvald; Arnberg, Lars. (2008) X-Ray Imaging of Solidification Processes and Microstructure Evolution. ASM Handbook, volume 15, Casting.
Academic chapter/article/Conference paper

Report

Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas; Johnsen, Roy; Krøkje, Åse. (2013) Enabling technologies at NTNU; materials science and engineering. 2013.
Report

Teaching

Courses

Media

2022

Academic lecture

Li, Yanjun; Wang, Shubo; Mathiesen, Ragnvald. (2022) Electric current flash heating (ECFH) induced abnormal nucleation and grain growth behavior during recrystallization of deformed aluminium alloys. The 8th International Conference on Solid -Solid Phase Transformations in Inorganic Materials ; Xi'an. 2022-06-27 - 2022-07-01.
Academic lecture

Mirzaei, Fazel; Tekseth, Kim Robert Bjørk; Scheidl, Katharina; Kaestner, Anders; Mathiesen, Ragnvald; Breiby, Dag Werner. (2022) Time-resolved 3D imaging of frost heave using neutron and X-ray computed tomography. Nordic perspectives on advanced neutron imaging ; 2022-11-23 - 2022-11-25.
Poster

Mirzaei, Fazel; Tekseth, Kim Robert Bjørk; Younas, Daniyal; Jaiswal, Mukul; Scheidl, Katharina; Kaestner, Anders; Chattopadhyay, Basab; Mathiesen, Ragnvald; Breiby, Dag Werner. (2022) Towards a quantitative microscale understanding of freezing soil using neutron and X-ray tomography. Research School for Training the Next Generation of Micro- and Nanotechnology Researchers in Norway (TNNN) ; 2022-11-30 - 2022-12-02.

2019

Academic lecture

Mathiesen, Ragnvald. (2019) On the usage and tuning of beam coherence in ultra-fast high-energy X-ray transmission microscopy. International Baltic School 2019: 4th generation X-ray sources: Coherent optics and Techniques . Immanuel Kant Baltic Federal University; Kaliningrad. 2019-08-26 - 2019-08-29.
Academic lecture

Mathiesen, Ragnvald. (2019) Real-time studies of dendritic growth in binary alloys by in-situ synchrotron X-ray imaging. Chineese Materials Conference CMC 2019 ; Chengdu. 2019-07-10 - 2019-07-14.
Academic lecture

Mathiesen, Ragnvald. (2019) Recent advances in 3-4D in situ X-ray imaging of solidification dynamics and microstructure formation. MRS Fall meeting . Materials Res. Soc.; Boston, MA. 2019-12-01 - 2019-12-06.
Academic lecture

Mathiesen, Ragnvald. (2019) X-ray imaging - towards studies of condensed matter at the mesoscale. Invitert foredrag . Inst. for matematikk og fysikk, UiS; Stavanger. 2019-02-15 - 2019-02-15.
Academic lecture

Mürer, Fredrik Kristoffer; Chattopadhyay, Basab; Madathiparambil, Aldritt Scaria; Tekseth, Kim Robert Bjørk; Di Michiel, Marco; Mathiesen, Ragnvald; Olstad, Kristin; Lilledahl, Magnus Borstad; Breiby, Dag Werner. (2019) 3D imaging of bone and cartilage by X-ray phase-contrast and diffraction computed tomography. NanoNetwork, 10th annual workshop ; Tromsø. 2019-06-17 - 2019-06-19.
Poster

Mürer, Fredrik Kristoffer; Chattopadhyay, Basab; Madathiparambil, Aldritt Scaria; Tekseth, Kim Robert Bjørk; Di Michiel, Marco; Mathiesen, Ragnvald; Olstad, Kristin; Lilledahl, Magnus Borstad; Breiby, Dag Werner. (2019) 3D imaging of bone and cartilage by X-ray phase-contrast and orientational diffraction tomography. ESRF User Meeting . ESRF; Grenoble. 2019-02-04 - 2019-02-06.
Poster

Mürer, Fredrik Kristoffer; Chattopadhyay, Basab; Madathiparambil, Aldritt Scaria; Tekseth, Kim Robert Bjørk; Di Michiel, Marco; Mathiesen, Ragnvald; Olstad, Kristin; Lilledahl, Magnus Borstad; Breiby, Dag Werner. (2019) Orientational imaging of bone and cartilage using small- and wide-angle X-ray scattering. Nordic Workshop on Scattering from Soft Matter (NSSM 2019) . iNano, University of Aarhus; Århus. 2019-01-08 - 2019-02-09.

2018

Academic lecture

Mathiesen, Ragnvald. (2018) In-situ X-ray imaging of evolving solidification microstructures. Invitert foredrag . Changchun University of Science and Technology; Changchun. 2018-07-17 - 2018-07-17.
Academic lecture

Mathiesen, Ragnvald. (2018) In-situ X-ray imaging of evolving solidification microstructures. Invitert foredrag . Dalian University of Technology; Dalian. 2018-07-16.
Academic lecture

Mathiesen, Ragnvald. (2018) In-situ X-ray studies of evolving solidification microstructures. Invitert foredrag . Institute for Metals Research - Chineese Academy of Siences; Shenyang. 2018-07-13 - 2018-07-13.
Academic lecture

Mathiesen, Ragnvald. (2018) On the application of in-situ X-ray imaging techniques in solidification science. Invitert foredrag . Shenyang University; Shenyang. 2018-07-06 - 2018-07-06.
Interview

Sund, Steinar; Breiby, Dag Werner; Mathiesen, Ragnvald. (2018) Store ambisjoner for røntgenlaser. Aftenposten Vitenskap [Tidsskrift]. 2018-01-20.
Poster

Zhang, Qiuyuan; Larsen, Helge Bøvik; Mathiesen, Ragnvald. (2018) Investigation of glitches induced by single-crystal diamond compound refractive lenses. Synchrotron Radiation Instrumentation (SRI 2018) ; 2018-06-10 - 2018-06-15.
Poster

Zhang, Qiuyuan; Polikarpov, Maxim; Klimova, Nataliya; Larsen, Helge Bøvik; Mathiesen, Ragnvald; Emerich, Hermann; Snigireva, Irina; Snigirev, Anatoly. (2018) Glitch spectroscopy of X-ray compound refractive lenses. Poster . ESRF; 2018-02-05 - 2018-02-07.

2017

Academic lecture

Browne, D. J.; Garcia-Moreno, F; Nguyen-Thi, H.; Zimmermann, G.; Kargl, F.; Mathiesen, Ragnvald; Griesche, A.; Minster, O.. (2017) Overview of In Situ X-Ray Studies of Light Alloy Solidification in Microgravity. TMS 2017 . TMS; San Diego. 2017-02-26 - 2017-03-02.
Academic lecture

Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Silikens, Wim H; Mathiesen, Ragnvald. (2017) Morphological Transition of a-Mg Dendrites During Near-Isothermal Solidification of a Mg–Nd–Gd–Zn–Zr Casting Alloy. TMS 2017 . TMS; San Diego. 2017-02-26 - 2017-03-02.
Academic lecture

Casari, Daniele; Mirihanage, Wajira; Falch, Ken Vidar; Ringdalen, Inga Gudem; Friis, Jesper; Schmid-Fetzer, Rainer; Zhao, Dongdong; Li, Yanjun; Silikens, Wim H; Mathiesen, Ragnvald. (2017) Morphological Transition of alpha-Mg Dendrites during Near-Isothermal Solidification of an Mg-Nd-Gd-Zn-Zr Casting Alloy. Solidification Processing 2017 (SP17) . BCAST, Brunel Univ. London, UK; Beaumont Estate, Old Windsor, UK. 2017-07-25 - 2017-07-29.
Academic lecture

Falch, Ken Vidar; Mathiesen, Ragnvald. (2017) Zernike Phase Contrast for Hard X-ray Transmission Microscopy. TMS2017 ; San Diego Convention Center. 2017-02-26 - 2017-03-02.
Academic lecture

Mathiesen, Ragnvald. (2017) Hard X-ray Transmission Microscopy. Swiss-Norwegian Workshop on Synchrotron and FEL-based Research . SNX, SNBL, PSI; Gradermoen. 2017-06-06 - 2017-06-07.
Academic lecture

Mathiesen, Ragnvald. (2017) Hard X-ray Transmission Microscopy (HXTM). SINTEF MC group seminar, Material physics . SINTEF MC; Trondheim. 2017-10-19 - 2017-10-19.
Interview

Mathiesen, Ragnvald; Idsø, Øyvind. (2017) Denne drypper nesten aldri. Hver gang den gjør det, jubler forskerne. Dagbladet [Avis]. 2017-05-17.
Academic lecture

Mirihanage, Wajira; Casari, Daniele; Falch, Ken Vidar; Mathiesen, Ragnvald. (2017) Examining Columnar Dendritic Growth under Dynamic Solute Concentration Level Variations. Solidification Processing 2017 (SP17) . BCAST, Brunel Univ. London, UK; Beaumont Estate, Old Windsor, UK. 2017-07-25 - 2017-07-29.
Academic lecture

Nguyen-Thi, Henri; Browne, David J.; Zimmermann, Gerhard; Reinhart, Guillaume; Murphy, Andrew G; Salloum-Abou-Jaoudé, Georges; Abou-Khalil, L; Mathiesen, Ragnvald; Silikens, Wim H. (2017) Overivew of In Situ X-ray Studies of Metal Alloy Solidification in Microgravity Conditions - The XRMON Project. Solidification Processing 2017 (SP17) . BCAST, Brunel Univ. London, UK; Beaumont Estate, Old Windsor, UK. 2017-07-25 - 2017-07-29.
Academic lecture

Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Liu, X.F.; Li, Yanjun. (2017) Nucleation and Growth of Primary Si during Solidification of Hypereutectic Al-Si Alloys: A Combined in situ X-radiography and ex situ TP-1 Type Test. Solidification Processing 2017 (SP17) . BCAST, Brunel Univ. London, UK; Beaumont Estate, Old Windsor, UK. 2017-07-25 - 2017-07-28.

2016

Poster

Falch, Ken Vidar; Mathiesen, Ragnvald. (2016) Polychromatic synchrotron radiation x-ray microscopy. SCANDEM . NTNU; Trondheim. 2016-06-07 - 2016-06-10.
Academic lecture

Mathiesen, Ragnvald; Falch, Ken Vidar. (2016) Hard X-ray Transmission Microscopy. CINEMA Midterm Workshop . DTU Fysikk; København. 2016-09-15 - 2016-09-16.

2015

Lecture

Mathiesen, Ragnvald. (2015) ESRF Phase II Source Upgrade. Norwegian Synchrotron and Neutron User Meeting ; Sola. 2015-01-19 - 2015-01-20.
Academic lecture

Mathiesen, Ragnvald. (2015) Solidification microstructure evolution in simulated spot welding by ultra-fast time-resolved X-ray diffraction. ICSSP6 ; Hyderabad. 2015-11-24 - 2015-11-27.
Academic lecture

Mirihanage, Wajira; Di Michiel, Marco; Mathiesen, Ragnvald. (2015) Ultra-fast in-situ X-ray studies of evolving columnar dendrites in solidifying steel weld pools. MCWASP XIV: INTERNATIONAL CONFERENCE ON MODELLING OF CASTING, WELDING AND ADVANCED SOLIDIFICATION PROCESSES ; 2015-06-21 - 2015-06-26.
Poster

Reiten, Andreas; Mathiesen, Ragnvald; Chernyshov, Dimitry. (2015) Strain-induced relaxor to anti-ferroelectric transition in PMN-PT thin films. Norwegian Synchrotron and Neutron User Meeting ; Sola. 2015-01-19 - 2015-01-20.

2014

Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) A bimodal microstructure and improved mechanical properties of an Al-Mg alloy processed by ECAP combined with inter-pass annealing. NanoSPD6 ; 2014-06-29 - 2014-07-04.
Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Development of high strength and high ductility Al-Mg alloys by ECAP and inter-pass annealing. NMS SOMMERMØTE 2014 ; 2014-06-04 - 2014-06-05.
Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2014) Influence of Mg content, grain size and strain rate on mechanical properties and deformation behaviors in Al-Mg alloys processed by ECAP and annealing. ICAA 2014 . NTNU; 2014-06-15 - 2014-06-19.

2013

Academic lecture

Høydalsvik, Kristin; Fløystad, Jostein Bø; Zhao, Tiejun; Esmaeili, Morteza; Diaz, Ana; Andreasen, Jens Wenzel; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2013) In situ coherent X-ray diffractive imaging of CO2-storing nanoparticles. Norwegian PhD Network on Nanotechnology for Microsystems; 4th annual workshop ; Bergen. 2013-06-17 - 2013-06-19.
Academic lecture

Høydalsvik, Kristin; Fløystad, Jostein Bø; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2013) Using X-rays for investigating nanoscale particles and structures. Invited guest lecture at ESRF, Grenoble. ; ESRF, Grenoble. 2013-10-09.
Academic lecture

Mathiesen, Ragnvald. (2013) New opportunities in material science - Fast kinetics and mesoscale structure dynamics seen with a new source. ESRF User Meeting - Work Shop Material Science and Chemistry . European Synchrotron Radiation Facility; Grenoble. 2013-02-04 - 2013-02-06.
Academic lecture

Mathiesen, Ragnvald. (2013) Synchrotron X-ray imaging for the study of solidification in metallic alloys. The II International Baltic School on Methods and Instruments of the X-ray investigation . The Immanuel Kant Baltic Federal University; Kaliningrad. 2013-10-03 - 2013-10-07.
Academic lecture

Mathiesen, Ragnvald. (2013) Time-resolved X-ray diffraction and imaging studies of liquid->solid phase transformation. Instituttseminar . Institutt for fysikk, DTU; København/Lyngby. 2013-11-14 - 2013-11-14.
Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2013) Development of an Al-7Mg alloy with a high strength and good ductility by ECAP. 5th International Conference on Recrystallization & Grain Growth 2013 ; 2013-05-05 - 2013-05-10.

2012

Academic lecture

Fløystad, Jostein Bø; Esmaeili, Morteza; Böttiger, Arvid P.L.; Høydalsvik, Kristin; Diaz, Ana; Mathiesen, Ragnvald; Rønning, Magnus; Andreasen, Jens Wenzel; Breiby, Dag Werner. (2012) Lensless X-Ray Imaging in Non-Ambient Conditions for Materials Science. Norwegian Synchrotron and Neutron User Meeting 2012 ; Sola, Rogaland. 2012-01-30 - 2012-01-31.
Academic lecture

Fløystad, Jostein Bø; Esmaeili, Morteza; Høydalsvik, Kristin; Diaz, Ana; Mathiesen, Ragnvald; Rønning, Magnus; Andreasen, Jens Wenzel; Breiby, Dag Werner. (2012) In Situ Lensless X-ray Microscopy in Material Science. "SCANDEM", Annual Meeting of the Nordic Microscopy Society ; Bergen. 2012-06-13.
Academic lecture

Fløystad, Jostein Bø; Esmaeili, Morteza; Høydalsvik, Kristin; Diaz, Ana; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2012) In Situ X-ray Coherent Diffractive Imaging. 7th International Conference on the Physical Properties and Application of Advanced Materials ; Trondheim. 2012-06-18.
Academic lecture

Fløystad, Jostein Bø; Esmaeili, Morteza; Høydalsvik, Kristin; Mathiesen, Ragnvald; Andreasen, Jens Wenzel; Rønning, Magnus; Breiby, Dag Werner. (2012) Towards 3D imaging of working catalyst nanoparticles. HYBRIS: HYbrid Beamline for In Situ 3D Resonant Imaging and Spectroscopy . Øresund Materials Innovation Community; Technical University of Denmark (DTU). 2012-12-12 - 2012-12-12.
Academic lecture

Darlapudi, A; Felberbaum, M; Mathiesen, Ragnvald; Dahle, Arne Kristian. (2012) The Influence of Cu on Eutectic Nucleation and Morphology in Hypoeutectic Al-Si Alloys. ICAA13: 13th International Conference on Aluminum Alloys ; 2012-07-03 - 2012-07-07.
Academic lecture

Mathiesen, Ragnvald. (2012) Solidification microstructure formation and evolution in eutecetics studied by time-resolved X-ray imaging. Hero-M 2012 . KTH, Stockholm; Skepparholmen. 2012-05-23 - 2012-05-24.
Academic lecture

Mathiesen, Ragnvald. (2012) Synchrotron radiation as a tool in material science and engineering. Leading Edges in Welding - Summer School in Modelling of Welding . TWI Ltd; Granta Park, Cambridge. 2012-07-30 - 2012-08-02.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2012) X-radiographic video microscopy studies of alloy solidification processes. Norwegian Synchrotron and Neutron User Meeting . Norsk Forskningsråd - SYNKNØYT-PROG; 2012-01-30 - 2012-01-31.
Academic lecture

Mirihanage, Wajira; Arnberg, Lars; Mathiesen, Ragnvald. (2012) In-situ observation of transient columnar dendrite growth in the presence of thermo-solutal convection. MCWASP XIII . Univ. Loeben; Schladming. 2012-06-17 - 2012-06-22.
Academic lecture

Murphy, Andrew G; Browne, David; Mirihanage, Wajira; Mathiesen, Ragnvald. (2012) Real time in-situ observations of equiaxed dendrite coherency in al-cu alloys using high brilliance 3rd generation synchrotron sources. TMS Annual Meeting . TMS; Orlando. 2012-03-11 - 2012-03-15.
Academic lecture

Reinhart, G; Nguyen-Thi, H; Bogno, A; Billia, B; Houltz, Y; Loth, K; Voss, D; Verga, A; de Pascale, F; Mathiesen, Ragnvald; Zimmermann, Gerhard. (2012) X-RAY RADIOGRAPHIC OBSERVATION OF DIRECTIONAL SOLIDIFICATION UNDER MICROGRAVITY: XRMON-GF EXPERIMENTS ON MASER12 SOUNDING ROCKET MISSION. TMS Annual Meeting . TMS; San Antonio, Texas. 2012-03-11 - 2012-03-15.
Poster

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen; Bjørge, Ruben. (2012) Annealing response and strengthening mechanisms of an Al-7,5Mg alloy processed by ECAP. TMS Annual Meeting 2012 . TMS; Orlando, Florida. 2012-03-11 - 2012-03-15.
Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen; Bjørge, Ruben. (2012) Annealing response and strengthening mechanisms of an Al-7Mg alloy processed by ECAP. Nasjonal Konferanse for Materialteknologi, Sommermøte 2012 . Norsk Metallurgisk Selskap; Trondheim. 2012-05-09 - 2012-05-10.

2011

Poster

Høydalsvik, Kristin; Esmaeili, Morteza; Fløystad, Jostein Bø; Granlund, Håvard; Buset, Ole Tore; Mathiesen, Ragnvald; Breiby, Dag Werner. (2011) GAXS – a multipurpose instrument for X-ray scattering experiments. GISAXS 2011 . HASYLAB / DESY; HASYLAB. 2011-10-10 - 2011-10-12.
Poster

Fløystad, Jostein Bø; Høydalsvik, Kristin; Mathiesen, Ragnvald; Rønning, Magnus; Breiby, Dag Werner. (2011) In situ X-ray imaging of catalyst nanoparticles. HERCULES 2011 ; 2011-03-18 - 2011-03-18.
Poster

Høydalsvik, Kristin; Buset, Ole Tore; Mathiesen, Ragnvald; Breiby, Dag Werner. (2011) General Angle X-ray Scattering (“GAXS”) – a multipurpose instrument for X-ray scattering experiments. 6th Annual NTNU NanoLab Meeting . NTNU NanoLab; 2011-11-16 - 2011-11-16.
Academic lecture

Mathiesen, Ragnvald. (2011) Studies of solidification microstructure evolution in metals by synchrotron experiments. Metallurgmøtet, Stockholm 2011 . Jernverkskontoret; KTH Stockholm. 2011-01-19 - 2011-01-20.
Academic lecture

Mathiesen, Ragnvald. (2011) X-radiographic video microscopy studies of alloy solidification processes. Instituttseminar, Dept. Mat. Eng. and Mat. Sci., Univ. Queensland . Dept. Mat. Eng. and Mat. Sci., Univ. Queensland; Brisbane. 2011-05-31 - 2011-05-31.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Dahle, Arne Kristian. (2011) Al-Si eutectic microstructure formation in directional solidification of Al-Si-Cu alloys. The fourth Chineese-Norwegian symposium on light metals & new energy . NTNU; Trondheim. 2011-08-24 - 2011-08-26.
Academic lecture

Nguyen-Thi, H; Bogno, A; Reinhart, G; Billia, B; Mathiesen, Ragnvald; Zimmermann, Gerhard; Houltz, Y; Loth, K; Voss, D; Verga, A; de Pascale, F. (2011) XRMON-GF experimental set-up devoted to x-ray radiographic observation of directional solidification under microgravity on maser12 sounding rocket mission. 20th ESA Symposium on European Rocket & Balloon Programmes and related research ; Hyeres. 2011-05-22 - 2011-05-26.
Academic lecture

Zha, Min; Li, Yanjun; Mathiesen, Ragnvald; Bjørge, Ruben; Roven, Hans Jørgen. (2011) Microstructure evolution in an UFG Al-7Mg alloy processed by ECAP during subsequent annealing. The 4th Chinese–Norwegian Symposium on Light Metals ; 2011-08-24 - 2011-08-28.

2010

Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun; Dahle, Arne Kristian. (2010) In-situ X-ray video microscopy studies of Al-Si eutectic solidification. ICAA12 . Intl. Aluminium Assoc.; Yokohama. 2010-09-06 - 2010-09-09.
Academic lecture

Delaleau, Pierre; Beckermann, Christoph; Mathiesen, Ragnvald; Arnberg, Lars. (2010) Mesoscopic Simulation of Directional Solidification of Al-Cu Alloys with Convection. The 2nd International Symposium on Cutting Edge of Computer Simulation of Solidification and Casting (CSSC2010) . The Iron and Steel Institute of Japan (ISIJ); Sapporo. 2010-02-03 - 2010-02-05.
Poster

Fløystad, Jostein Bø; Grepstad, Sigrid; Mo, Frode; Mathiesen, Ragnvald; Tybell, Thomas; Breiby, Dag Werner. (2010) Domain size distributions in ferroelectric PbTiO3 thin films. 1st annual workshop in the Norwegian PhD Network on Nanotechnology for Microsystems ; 2010-05-29 - 2010-06-02.
Academic lecture

Mathiesen, Ragnvald. (2010) Synchrotron radiation - opportunities in material science. Hero-m Summer School . Hero-m CoE/KTH; Tallberg. 2010-06-28 - 2010-07-01.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2010) X-radiographic video microscopy studies of alloy solidification processes. Deutsche Physikalische Gesellschaft Spring Meeting . Deutsche Physikalische Gesellschaft; Regensburg. 2010-03-22 - 2010-03-26.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2010) X-radiographic video microscopy studies of solidification processes. Work Shop - Spring-8 synchrotron, Japan . Spring-8 og Univ. Osaka; Spring-8. 2010-02-08 - 2010-02-08.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2010) X-radiographic video microscopy studies of solidification processes - eutectic solidification. The 2nd International Symposium on Cutting Edge of Computer Simulation of Solidification and Casting (CSSC2010) . Iron and Steel Institute of Japan (ISIJ); Sapporo. 2010-02-03 - 2010-02-05.

2009

Academic lecture

Delaleau, Pierre; Mathiesen, Ragnvald; Schaffer, Paul; Arnberg, Lars; Beckermann, Christoph. (2009) Modeling and in-situ X-ray video microscopy of confined equiaxed grain growth and buoyant motion in Al-Cu. Modelling of Casting, Welding and Advanced Solidification Processes, MCWASP XII ; Vancouver. 2009-06-07 - 2009-06-14.
Academic lecture

Delaleau, Pierre; Mathiesen, Ragnvald; Schaffer, Paul; Bellmann, Martin; Arnberg, Lars. (2009) Impact of confinement on the growth of equiaxed grains in Al-Cu during X-ray radiography. TMS2009 . The Minerals, Metals & Materials Society (TMS); San Francisco. 2009-02-15 - 2009-02-19.
Academic lecture

Mathiesen, Ragnvald. (2009) In situ X-ray videomicroscopy on evolving alloy solidification microstructures. Instituttseminar . Computational Material Science, EPFL; Lausanne. 2009-07-01.
Academic lecture

Mathiesen, Ragnvald. (2009) Microstructure evolution and fundamental characteristics in solidification of metals and alloys - a comparison of modelling and experiments. TMS2009 . The Mineral, Metals & Materials Society (TMS); San Francisco. 2009-02-15 - 2009-02-19.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2009) In situ X-ray videomicroscopy on evolving solidification microstructures in eutectic alloys. Insitituttseminar . Risø DTU Dept. of Materials Research; Risø DTU. 2009-12-15 - 2009-12-15.
Academic lecture

Mathiesen, Ragnvald; Arnberg, Lars. (2009) Real-time X-ray imaging of diffusive and convective mass transport in alloy solidification processing. MaxLab User Meeting . Max Lab; Lund. 2009-11-02 - 2009-11-04.

2007

Academic lecture

Mathiesen, Ragnvald. (2007) Solidification Processing of Metals studied by in-situ X-ray video microscopy. Instituttseminar . Inst. National Polytech. Grenoble; Grenoble. 2007-11-05 - 2007-11-05.
Academic lecture

Mathiesen, Ragnvald. (2007) Solidification Processing of Metals studied by in-situ X-ray video microscopy. MaxLab User Meeting and MaxLabIV Work shop . MaxLab; Lund. 2007-10-29 - 2007-10-31.
Academic lecture

Mathiesen, Ragnvald. (2007) Solidification Processing of Metals studied by in-situ X-ray video microscopy. Instituttseminar . Dept. of Material Science, Univ. Queensland; Brisbane. 2007-10-18 - 2007-10-18.

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Ragnvald Mathiesen

Ragnvald Mathiesen

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