Strengthening mechanisms and dislocation processes in < 111 > textured nanotwinned copper

被引:22
作者
Zhao, Xing [1 ,2 ]
Lu, Cheng [1 ]
Tieu, Anh Kiet [1 ]
Pei, Linqing [1 ]
Zhang, Liang [1 ]
Cheng, Kuiyu [1 ]
Huang, Minghui [2 ]
机构
[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
[2] Cent South Univ Technol, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 676卷
基金
中国国家自然科学基金;
关键词
Strengthening mechanism; Dislocation; Slip transmission; Nanotwinned Cu; Molecular dynamics; MOLECULAR-DYNAMICS SIMULATION; COHERENT TWIN BOUNDARIES; CENTERED-CUBIC METALS; COLUMNAR-GRAINED CU; DEFORMATION MECHANISMS; GROWTH TWINS; NANOCRYSTALLINE AL; ULTRAHIGH STRENGTH; NANOSCALE TWINS; BEHAVIOR;
D O I
10.1016/j.msea.2016.08.127
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We use molecular dynamics simulations to elucidate the deformation mechanisms of < 111 > textured nanotwinned materials under tensile loading parallel to the twin boundary (TB). Our simulations reveal that the tensile strength of nanotwinned Cu increases monotonically as the twin spacing decreases. The strengthening effect mainly results from TB restricting the transmission of dislocations across the TB. Throughout the simulations the transmissions of dislocations across the TBs dominate the plastic deformation. Both direct and indirect transmissions are identified at atomic level. Direct transmission involves either successive transmission of the leading and trailing partials as in the Fleischer cross-slip model or absorption and desorption of the extended dislocation as in the Friedel-Escaig cross-slip mechanism. In contrast, indirect transmission involves the formation of special superjogs. The persistent slip transfer leaves zigzag slip traces on the cross-sectional view and the inhomogeneous deformation leads to the formation of intersecting slip bands on the plane view. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:474 / 486
页数:13
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