Grain size effects on dislocation and twinning mediated plasticity in magnesium

被引：145

作者：

Fan, Haidong ^{[1
,2
]}

Aubry, Sylvie ^{[3
]}

Arsenlis, Athanasios ^{[3
]}

El-Awady, Jaafar A. ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[2] Sichuan Univ, Dept Mech, Chengdu 610065, Sichuan, Peoples R China

[3] Lawrence Livermore Natl Lab, Div Mat Sci, Livermore, CA 94551 USA

来源：

SCRIPTA MATERIALIA | 2016年 / 112卷

基金：

中国国家自然科学基金;

关键词：

Discrete dislocation dynamics; Size effects; Dislocation-twin boundary interactions; Magnesium; Twinning plasticity; CLOSE-PACKED MAGNESIUM; POLYCRYSTALLINE MAGNESIUM; ROOM-TEMPERATURE; SINGLE-CRYSTALS; ALLOY AZ31B; HCP METALS; DEFORMATION; SLIP; BEHAVIOR; SIMULATIONS;

D O I：

10.1016/j.scriptamat.2015.09.008

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Grain size effects on the competition between dislocation slip and {10 (1) over bar2}-twinning in magnesium are investigated using discrete dislocation dynamics simulations. These simulations account for dislocation-twin boundary interactions and twin boundary migration through the glide of twinning dislocations. It is shown that twinning deformation exhibits a strong grain size effect; while dislocation mediated slip in untwinned polycrystals displays a weak one. This leads to a critical grain size at 2.7 mu m, above which twinning dominates, and below which dislocation slip dominates. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：50 / 53

页数：4

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