Grain size effects on dislocation and twinning mediated plasticity in magnesium

被引：151
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
收藏
页码：50 / 53
页数：4
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