Strengthening-softening transition in yield strength of nanotwinned Cu

被引：29
|
作者：
Xiao, Jianwei [1 ]
Yang, Huizhen [1 ]
Liu, Hexiong [1 ]
Younus, Fatima [1 ]
Xu, Bo [1 ]
Zhang, Xiangyi [1 ]
Wang, Yanbin [2 ]
Wen, Bin [1 ]
机构：
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[2] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60439 USA
来源：
SCRIPTA MATERIALIA | 2019年 / 162卷
基金：
中国国家自然科学基金;
关键词：
Nanotwins; Dislocation; Yield strength; Molecular dynamics; COHERENT TWIN BOUNDARIES; STRAIN-RATE SENSITIVITY; COLUMNAR-GRAINED CU; DEFORMATION MECHANISMS; DISPLACEMENT FIELD; MAXIMUM STRENGTH; PEIERLS STRESS; FLOW-STRESS; DISLOCATIONS; DUCTILITY;
D O I：
10.1016/j.scriptamat.2018.11.049
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
It is known that the strength of nanotwinned copper increases with decreasing twin thickness, reaches a maximum at twin thickness of 15 nm, and then decreases with twin thickness down to 4 nm. To understand this behavior, critical resolved shear stresses of various slip modes in nanotwinned copper are investigated using molecular dynamics simulations. Based on the Sachs polycrystalline model, twin thickness dependent yield strengths are deduced that are in good agreement with experimental data. The strengthening-softening behavior is attributed to a transition from partial dislocations slipping in twin boundaries to detwinning induced by incoherent twin boundary migration. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：372 / 376
页数：5
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