R
Randi Holmestad
Researcher at Norwegian University of Science and Technology
Publications - 293
Citations - 5911
Randi Holmestad is an academic researcher from Norwegian University of Science and Technology. The author has contributed to research in topics: Alloy & Scanning transmission electron microscopy. The author has an hindex of 37, co-authored 272 publications receiving 4667 citations. Previous affiliations of Randi Holmestad include Arizona State University & SINTEF.
Papers
More filters
Journal ArticleDOI
The influence of alloy composition on precipitates of the Al−Mg−Si system
TL;DR: In this article, six Al−Mg−Si alloys aged at 175 °C were investigated by transmission electron microscopy (TEM) to study how changes in solute elements affect precipitation.
Journal ArticleDOI
Atomap: a new software tool for the automated analysis of atomic resolution images using two-dimensional Gaussian fitting.
TL;DR: This work presents a free and open source software tool for analysing both the position and shapes of atomic columns in STEM-images, using 2-D elliptical Gaussian distributions, and can extract changes in the lattice parameters and shape of A-cation columns from annular dark field images of perovskite oxide heterostructures.
Journal ArticleDOI
Composition of β″ precipitates in Al–Mg–Si alloys by atom probe tomography and first principles calculations
Håkon S. Hasting,A.G. Frøseth,S. J. Andersen,Rene Vissers,John C. Walmsley,Calin Daniel Marioara,Frédéric Danoix,Williams Lefebvre,Randi Holmestad +8 more
TL;DR: The composition of β″ precipitates in an Al-Mg-Si alloy has been investigated by atom probe tomography, ab initio density functional calculations, and quantitative electron diffraction.
Journal ArticleDOI
Post-β″ phases and their influence on microstructure and hardness in 6xxx Al-Mg-Si alloys
TL;DR: In this paper, three Al-Mg-Si alloys with similar total solute content (1.3 ) were heat-treated at 250 or 260°C and investigated by transmission electron microscopy.
Journal ArticleDOI
Detailed atomistic insight into the β″ phase in Al–Mg–Si alloys
Per Harald Ninive,Are Strandlie,Sverre Gulbrandsen-Dahl,Williams Lefebvre,Calin Daniel Marioara,S. J. Andersen,Jesper Friis,Randi Holmestad,Ole Martin Løvvik,Ole Martin Løvvik +9 more
TL;DR: In this article, the authors used advanced microscopy, ab initio atomistic calculations and strength measurements of Al-Mg-Si alloys containing β-phase precipitates to improve understanding of the industrially important hardening process.