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Discrete dislocation dynamics simulations of twin size-effects in magnesium

Published online by Cambridge University Press:  12 February 2015

Haidong Fan ,
Sylvie Aubry ,
A. Arsenlis  and
Jaafar A. El-Awady
Haidong Fan*
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA Department of Mechanics, Sichuan University, Chengdu, Sichuan 610065, P. R. China
Sylvie Aubry
Affiliation:
Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, CA 94551-0808, USA
A. Arsenlis
Affiliation:
Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, CA 94551-0808, USA
Jaafar A. El-Awady*
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
*
*E-mails: haidongfan8@foxmail.com (H. Fan), jelawady@jhu.edu (J. A. El-Awady)
*E-mails: haidongfan8@foxmail.com (H. Fan), jelawady@jhu.edu (J. A. El-Awady)
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Abstract

A dislocation-{101̅2} twin boundary (TB) interaction model was proposed and introduced into discrete dislocation dynamics simulations to study the mechanical behavior of micro-twinned Mg. Strong strain hardening was captured by current simulations, which is associated with the strong TB’s barrier effect. In addition, twin size effects with small TB spacing leading to a strong yield stress, were observed to be orientation dependent. Basal slip orientation produces a strong size effect, while prismatic slip does a weak one.

Keywords

dislocationsMgpolycrystal

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