Atomic scale structural characterization of {10(1)over-bar2} twin boundaries in zinc

被引：5
|
作者：
Wu, Hai-chen [1 ]
Yu, You-xing [1 ]
Bi, Xiao-fang [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 08期
关键词：
zinc; twin boundaries; basal/prismatic BP/PB serrations; migration mechanism; high-resolution transmission electron microscopy (HRTEM); CLOSE-PACKED METALS; DEFORMATION TWINS; MAGNESIUM; SHEAR;
D O I：
10.1016/S1003-6326(18)64749-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The structure and the migration mechanisms of {10 (1) over bar2} twin boundaries (TBs) of pure zinc deformed by rolling were studied using high-resolution transmission electron microscopy (HRTEM) at atomic scale. We found the presence of basal/prismatic (BP/PB) planes serrations on {10 (1) over bar2} TBs and the coexistence of two kinds of TBs with different structures in the same {10 (1) over bar2} twin: TBs composed of {10 (1) over bar2} coherent twin boundaries (CTBs) plus short BP/PB serrations, and TBs composed of successive BP/PB segments without {10 (1) over bar2} CTBs. The formation of BP/PB serrations has no relation to the cla ratio of hexagonal-close-packed (HCP) metals because the BP/PB serrations are energetically preferred and geometrically favored. Based on dislocation theory, we proposed the migration mechanisms of the TBs to be the glide of twinning dislocations (TDs) on the CTBs and the climb of interface dislocations (IDs) on the BP/PB segments.
引用
收藏
页码：1538 / 1542
页数：5
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