Dislocation impediment by the grain boundaries in polycrystals

2020/08/20 by Yinguang Piao, Piao, Yinguang, Khanh Chau Le +1
Engineering · Materials Science · Physics and Astronomy · #High-Velocity Impact and Material Behavior #Microstructure and Mechanical Properties of Steels #Microstructure and mechanical properties #cond-mat.mtrl-sci

paper · pdf · doi:10.48550/arxiv.2008.09056

29 pages, 15 figures

arxiv created 2021/04/12 · arxiv updated 2021/04/13

Abstract

Thermodynamic dislocation theory incorporating dislocation impediment by the grain boundaries is developed to analyze the shear test of polycrystals. With a small set of physics based material parameters, we are able to simulate the stress-strain curves for the load and its reversal, which are consistent with the experimental curves of Thuillier and Manach [2009]. Representative distributions of plastic slip under load and its reversal are presented, and their evolution explains the extended length of the transition stage during load reversal.

Citations

• Some geometrical relations in dislocated crystals

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