Randi Holmestad
Background and activities
Dr. Holmestad (born in 1967) is professor at Dept. of Physics NTNU (since 99). Degrees: Dr. ing. (PhD) in materials physics, NTH, 1994, Siv. ing (MSc) in technical physics, NTH, 1991. Holmestad's present research interests are focussed on materials physics; transmission electron diffraction and microscopy (TEM), materials microstructure and the relation to macroscopic properties. Ongoing projects are on aluminium alloys, solar cell materials, electron diffraction and new functional materials. She has educated 14 PhD students and 63 MSc students, in addition to co-supervision of 8 PhD students. Holmestad has had several sabbaticals abroad, latest 6 months in 2005 and 2012, both at University of Illinois, Urbana-Champaign, IL, USA. Web of Science (Jan 2019): Cited documents = 203, Citations ~2700, h index = 28.
She has initiated and been project leader for several externally funded projects over the past fifteen years, funded mainly by the Norwegian Research Council and Hydro Aluminium. The main research projects she have been involved in are Quantitative convergent beam electron diffraction (2000-03), the SUP Micro- and nanostructural materials development (2001-06), the NorLight project Heat treatment fundamentals (2001-07), the Industry initiated project Nucleation control for optimised properties (2007-12), the FRINAT project Fundamental investigations of clustering (2007-11), the Japanese-Norwegian Al-Mg-Si precipitation project (2009-14 and 2019-2022), the FRINATEK project Fundamental investigations of precipitation in the solid state with focus on Al-based alloys (2013-17), the KPN project Fundamentals of intergranualr corrosion -FICAL (2017-2021) and last the KPN project Solute cluster manipulation for optimized properties in Al-Mg-Si based Al alloys (SumAl)(2019-2024). In addition she has been leader of TEM Gemini Centre (SINTEF, NTNU) 2006, 2008-2013, and leader for a Nordic network within TEM in Nordforsk, NorTEMnet, 2010-2014. She was the project leader of NORTEM, Norwegian Centre of transmission electron microscopy, 2010-2013, 2017- >) a large scale infrastructure project in TEM, from SINTEF, UiO and NTNU (total project 115 MNOK, 2011-20). Since 2015 she is involved in the SFI project CASA, Centre of advanced structural analysis.
Research interests
- Electron microscopy and spectroscopy (TEM, HREM, EDS, EELS, STEM)
- Electron diffraction; Quantitative Convergent Beam electron Diffraction (CBED), Electron crystallography
- Microstructure characterization of inorganic materials, alloys and intermetallics, precipitation in aluminium alloys, functional oxides, solar cell materials, relationships between micro/nano-structure and properties of materials, bonding
- Modelling and simulations in materials physics; Solid state calculations
Links
Scientific, academic and artistic work
A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database
Journal publications
- (2020) The effect of low Cu additions on precipitate crystal structures in overaged Al-Mg-Si(-Cu) alloys. Materials Characterization. vol. 160.
- (2020) The effect of heavy deformation on the precipitation in an Al-1.3Cu-1.0Mg-0.4Si wt.% alloy. Materials & design. vol. 186.
- (2019) Characterisation of structural similarities of precipitates in Mg–Zn and Al–Zn–Mg alloys systems. Philosophical Magazine. vol. 99 (21).
- (2019) An unreported precipitate orientation relationship in Al-Zn-Mg based alloys. Materials Characterization. vol. 158.
- (2019) Nanocrystal segmentation in scanning precession electron diffraction data. Journal of Microscopy.
- (2019) Nano-scale characterisation of sheared β” precipitates in a deformed Al-Mg-Si alloy. Scientific Reports. vol. 9.
- (2019) Controlling Phase Purity and Texture of K0.5Na0.5NbO3 Thin Films by Aqueous Chemical Solution Deposition. Materials. vol. 12 (13).
- (2019) Precipitation behavior in an Al-Cu-Mg-Si alloy during ageing. Materials Science & Engineering: A. vol. 767.
- (2019) An analytical framework for modelling intermetallic compound (IMC) formation and optimising bond strength in aluminium‐steel welds. Material Design & Processing Communications. vol. 1 (3).
- (2019) Precipitation in an extruded AA7003 aluminium alloy: Observations of 6xxx-type hardening phases. Materials & design. vol. 186.
- (2019) Effect of copper addition on precipitation behavior near grain boundary in Al-Zn-Mg alloy. Materials transactions. vol. 60 (8).
- (2019) The Effect of Elastic Strain and Small Plastic Deformation on Tensile Strength of a Lean Al–Mg–Si Alloy. Metals. vol. 9 (12).
- (2019) Scanning Precession Electron Diffraction to aid Aluminum Alloy Development. Microscopy and Microanalysis. vol. 25.
- (2019) Crystallographic relationships of T-/S-phase aggregates in an Al–Cu–Mg–Ag alloy. Acta Materialia. vol. 166.
- (2019) In situ heating TEM observations of evolving nanoscale Al‐Mg‐Si‐Cu precipitates. Journal of Microscopy.
- (2019) Muon Spin Relaxation Study of Solute–Vacancy Interactions During Natural Aging of Al-Mg-Si-Cu Alloys. Metallurgical and Materials Transactions. A. vol. 50 (8).
- (2018) Precipitates in aluminium alloys. Advances in Physics: X. vol. 3 (1).
- (2018) Lattice rotations in precipitate free zones in an Al-Mg-Si alloy. Materials Characterization. vol. 144.
- (2018) Effect of copper addition on the cluster formation behavior of Al-Mg-Si, Al-Zn-Mg, and Al-Mg-Ge in the natural aging. Metallurgical and Materials Transactions. A. vol. 49 (11).
- (2018) In situ DSC investigation into the kinetics and microstructure of dispersoid formation in Al-Mn-Fe-Si(-Mg) alloys. Materials & design. vol. 146.