Pure-Shuffle Nucleation of Deformation Twins in Hexagonal-Close-Packed Metals

被引：193
作者：
Wang, J. [1 ]
Yadav, S. K. [1 ]
Hirth, J. P. [2 ]
Tome, C. N. [1 ]
Beyerlein, I. J. [3 ]
机构：
[1] Los Alamos Natl Lab, MST 8, Los Alamos, NM 87545 USA
[2] Los Alamos Natl Lab, MPA CINT, Los Alamos, NM 87545 USA
[3] Los Alamos Natl Lab, T-3, Los Alamos, NM 87545 USA
来源：
MATERIALS RESEARCH LETTERS | 2013年 / 1卷 / 03期
关键词：
Twin Nucleation; Pure-Shuffle; Grain Boundary; Magnesium; Atomistic Simulations;
D O I：
10.1080/21663831.2013.792019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The propagation of deformation twins in hexagonal-close-packed metals is commonly described by a conventional glide-shuffle mechanism. The widely accepted convention is that this process is also responsible for twin nucleation, but lacks direct confirmation. Using atomistic simulations, we identify an unconventional pure-shuffle mechanism for the nucleation of ((1) over tilde 012) twins, which then grow through the conventional glide-shuffle mechanism entailing the glide of twinning disconnections. The pure-shuffle nucleation of twins at grain boundaries can be ascribed to a high-stress concentration and pre-existing grain boundary dislocations.
引用
收藏
页码：126 / 132
页数：7
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