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 16 PhD students and 67 MSc students, in addition to co-supervision of 8 PhD students. Holmestad has had several sabbaticals abroad - 6 months in 2005 and 2012, both at University of Illinois, Urbana-Champaign, IL, USA and 2 months at Monash University, Melbourne, Australia in 2019. Web of Science (April 2020): Cited documents = 220, Citations ~3300, h index = 30.
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.
This is a link to the Norwegian Research Councils project bank
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
2021
- (2021) Effect of pre-deformation on age-hardening behaviors in an Al-Mg-Cu alloy. Materials Science & Engineering: A. vol. 820.
- (2021) Precipitation processes and structural evolutions of various GPB zones and two types of S phases in a cold-rolled Al-Mg-Cu alloy. Materials & design. vol. 199:109425.
- (2021) Vacancy and solute co-segregated η1 interface in over-aged Al-Zn-Mg alloys. Acta Materialia.
- (2021) Interface Microstructure and Tensile Properties of a Third Generation Aluminium-Steel Butt Weld Produced Using the Hybrid Metal Extrusion & Bonding (HYB) Process. Materials Science & Engineering: A. vol. 809.
- (2021) Linking mechanical properties to precipitate microstructure in three Al-Mg-Si(-Cu) alloys. Materials Science & Engineering: A. vol. 807 (11).
- (2021) On the microstructural origins of improvements in conductivity by heavy deformation and ageing of Al-Mg-Si alloy 6101. Materials Characterization. vol. 176.
2020
- (2020) Microstructural and mechanical characterisation of a second generation hybrid metal extrusion & bonding aluminium-steel butt joint. Materials Characterization.
- (2020) Detailed investigation of the shearing mechanism of β" precipitates in Al-Mg-Si alloys. MATEC Web of Conferences. vol. 326.
- (2020) Multislice image simulations of sheared needle‐like precipitates in an Al‐Mg‐Si alloy. Journal of Microscopy. vol. 279 (3).
- (2020) Fully resolved strain field of the β’’ precipitate calculated by density functional theory. Computational Materials Science. vol. 187.
- (2020) First principle calculations of pressure dependent yielding in solute strengthened aluminium alloys. Computational Materials Science. vol. 184.
- (2020) The unique hybrid precipitate in a peak-aged Al-Cu-Mg-Ag alloy. Scripta Materialia. vol. 194.
- (2020) Unique hybrid precipitate structures forming in an Al–Cu–Mg–Si alloy. Journal of Alloys and Compounds. vol. 826.
- (2020) Comparing intergranular corrosion in Al‐Mg‐Si‐Cu alloys with and without α‐Al(Fe,Mn,Cu)Si particles. Materials and corrosion - Werkstoffe und Korrosion. vol. 72.
- (2020) Atomic structure of solute clusters in Al-Zn-Mg alloys. Acta Materialia. vol. 205.
- (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals. vol. 10 (9).
- (2020) Grain boundary structures and their correlation with intergranular corrosion in an extruded Al-Mg-Si-Cu alloy. Materials Characterization. vol. 170.
- (2020) The effect of low Cu additions on precipitate crystal structures in overaged Al-Mg-Si(-Cu) alloys. Materials Characterization. vol. 160.
- (2020) Copper enrichment on aluminium surfaces after electropolishing and its effect on electron imaging and diffraction. Materials Characterization. vol. 172.