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

页码：62 / 66

页数：5

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