Publication 23-CNA-015

Modeling of experimentally observed topological defects inside bulk polycrystals

Siddharth Singh
Department of Civil and Environmental Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
ssingh3@andrew.cmu.edu

He Liu
Department of Physics
Carnegie Mellon University
Pittsburgh, PA 15213

Rajat Arora
Advanced Micro Devices, Inc. (AMD)
Austin, TX 78735

Robert Suter
Department of Physics
Carnegie Mellon University
Pittsburgh, PA 15213
suter@andrew.cmu.edu

Amit Acharya
Dept. of Civil & Environmental Engineering
Center for Nonlinear Analysis
Carnegie Mellon University
Pittsburgh, PA 15213
acharyaamit@cmu.edu

Abstract: A rigorous methodology is developed for computing elastic fields generated by experimentally observed defect structures within grains in a polycrystal that has undergone tensile extension. An example application is made using a near-field High Energy X-ray Diffraction Microscope measurement of a zirconium sample that underwent 13.6% tensile extension from an initially wellannealed state. (Sub)grain boundary features are identified with apparent disclination line defects in them. The elastic fields of these features identified from the experiment are calculated.

Get the paper in its entirety as  23-CNA-015.pdf

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