2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Discrete Dislocation Dynamics Simulations of Twinning Plasticity in Magnesium
Jaafar El-Awady1; Haidong Fan1;1JOHNS HOPKINS UNIVERSITY, Baltimore, United States;
Type of Paper: Regular
Id Paper: 231
Topic: 1
Abstract:
The crystal structure of hexagonal close-packed (HCP) crystals dictates complex deformation mechanisms, including dislocation-slip and twinning. As a result, the mechanical behavior of HCP metals displays strong anisotropy and strong orientation dependence and identifying the fundamental aspects of plastic deformation in this class of metals is necessary to help improve their performance through alloying and microstructure design. In this talk, we present a new implementation of twin boundaries (TBs) into the framework of DDD to simulate the collective evolution of dislocation and their interactions with TBs in magnesium (Mg) crystals. We report on the effect of crystal size and orientation on the deformation of Mg microcrystals. In addition, the new model is also used to investigate the mechanisms by which TBs and their size influence the yielding stress and hardening behavior of Mg single crystals. Finally, we report on the influence of dislocation interactions with TB and the glide of TB dislocations on the evolution and propagation of TBs.