期刊
MATERIALS RESEARCH LETTERS
卷 1, 期 3, 页码 126-132出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2013.792019
关键词
Twin Nucleation; Pure-Shuffle; Grain Boundary; Magnesium; Atomistic Simulations
资金
- Office of Basic Energy Sciences, under U.S. DOE [FWP 06SCPE401, W-7405-ENG-36]
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.
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