Origin of profuse {11(2)over-bar1} deformation twins in Mg-Gd alloys

被引：28
作者：
He, Cong [1 ]
Li, Zhigiao [1 ]
Kong, Dehao [1 ]
Zhao, Xiaojun [1 ]
Chen, Houwen [1 ,2 ,3 ]
Nie, Jian-Feng [4 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys, Minist Educ, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Shenyang Natl Lab Mat Sci, Chongqing 400044, Peoples R China
[3] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China
[4] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
来源：
SCRIPTA MATERIALIA | 2021年 / 191卷
基金：
中国国家自然科学基金;
关键词：
Deformation twins; Mg alloys; Twin boundary; First-principles calculations; HCP METALS; SEGREGATION; NUCLEATION; EVOLUTION;
D O I：
10.1016/j.scriptamat.2020.08.041
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Deformation twins in Mg-Gd alloys are investigated. It is found that the dominant twinning mode switches from {10 (1) over bar2} twinning to {11 (2) over bar1} twinning, with an increase in the Gd concentration in Mg. Our first-principles calculations suggest that the formation of the {11 (2) over bar1} twin in the Gd-rich alloy is triggered by the reduced {11 (2) over bar1} twin boundary energy, which results from strain relaxation along the twin boundary. Furthermore, this twinning mode is suggestive to be activated in other Mg alloys with a high concentration of solute atoms having larger size than Mg. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：62 / 66
页数：5
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