Highlight Seminar

TYC Seminar: Allotropy in Ultra High Strength Materials - David Joseph Srolovitz

City University of Hong Kong

View the recording here

Thursday 3 June 2021
Time: 3pm
Venue: Zoom
Contact: Devis Di Tommaso / Karen Stoneham

Abstract: Allotropic phase transformations may be driven by the application of stress - this is especially well-known for pressure driven transformations.  Recent advances in strengthening materials allow for the application of very large shear stresses as well - opening up vast new regions of stress space.  The presence of shear implies that phase transformations depend upon the full stress tensor and crystal/grain orientation.  We propose a crystal thermodynamics framework for describing phase transormations in polycrystalline solids and apply it through non-linear elasticity and density functional theory calculations.  In particular, we consider bcchcp transformations in iron, fcchcp transformations in nickel, and hcpfcc transformations in titanium. The results are quantitatively consistent with a range of experimental observations in these disparate systems.

Bio: David J. Srolovitz is a Chair Professor in Materials Science and Engineering and a Senior Fellow of the Insitute of Advanced Study. Previously, Srolovitz was a Chair of Mechanical & Aerospace Engineering and Professor of Applied & Computational Mathematics at Princeton University, Professor of Materials Science & Engineering and Applied Physics at the University of Michigan, and both Dean and Professor of Physics at Yeshiva University.  He also served as the Executive Director of the Institute of High Performance Computing, A*STAR in Singapore and was on the staffs of Los Alamos National Laboratory (Theoretical Division) and Exxon Corporate Research (Metallurgy).  He is the author of ~500 papers on topics in materials theory and simulation ranging from crystal defects, microstructure evolution, deformation, and growth processes.  He is a member of the US National Academy of Engineering and Fellow of the Materials Research Society, TMS, ASM International, and the Institute of Physics (UK). He is the winner of the 2013 Materials Research Society’s Materials Theory Award. He is one of the world’s most highly cited researchers in materials theory and simulation.

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