Atomic-scale mechanism of rhombohedral twinning in sapphire

被引：0

作者：

Tochigi, Eita ^{[1
,2
]}

Miao, Bin ^{[1
]}

Nakamura, Atsutomo ^{[2
,3
]}

Shibata, Naoya ^{[1
,4
]}

Ikuhara, Yuichi ^{[1
,4
,5
]}

机构：

[1] Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku,Tokyo,113-8656, Japan

[2] PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi,Saitama,332-0012, Japan

[3] Department of Mechanical Science and Bioengineering, Osaka University, 1-3 Machikaneyama-chou, Toyonaka,Osaka,560-8531, Japan

[4] Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya,Aichi,456-8587, Japan

[5] Center for Elements Strategy Initiative for Structure Materials, Kyoto University, Yoshidahonmachi, Sakyo-ku,Kyoto,606-8501, Japan

来源：

Acta Materialia | 2021年 / 216卷

基金：

日本学术振兴会;

关键词：

Atomic motion - Atomic-scale mechanisms - Collective properties - Cooperative motion - Deformation twinning - Ionic compounds - Rhombohedral twinning - Step structure;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Deformation twinning is a fundamental plastic deformation mode in crystals. Upon twinning, individual atoms must move in different directions to satisfy the twin symmetry, which is called atomic shuffling. However, actual atomic motions during shuffling are still unknown, especially for ionic compounds. Here, we report the dynamic twinning behavior dominated by the atomic shuffling in sapphire (α-Al2O3). The propagation and annihilation of twins are revealed to be mediated by migration of step structures on the matrix/twin interfaces. The step migration is driven by cooperative motions of a group of five atoms with relatively few recombination of Al–O bonds. Our findings imply that the atomic shuffling associated with twinning is determined by a collective property of a group of several atoms. © 2021

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