六方密排晶体中的形变孪生机制。

Deformation twinning mechanism in hexagonal-close-packed crystals.

作者信息

Jiang Shan, Jiang Zhongtao, Chen Qiaowang

机构信息

Research Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing, 402160, P. R. China.

出版信息

Sci Rep. 2019 Jan 24;9(1):618. doi: 10.1038/s41598-018-37067-8.

DOI:10.1038/s41598-018-37067-8

PMID:30679673

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6345936/

Abstract

The atomic structure of {10 [Formula: see text] 2} twin boundary (TB) from a deformed Mg-3Al-1Zn (AZ31) magnesium alloy was examined by using high-resolution transmission electron microscopy (HRTEM). By comparing the lattice structure of TB with the previously established model, a kind of special atomic combinations, here named primitive cells (PCs), were discovered at the TB. The PCs reorientation induced mechanism of twinning in hexagonal-close-packed (HCP) crystals was hence verificated. Meanwhile, the relationship between the misorientation of adjacent layers of PCs and the width of TB was discussed. The verification of the mechanism clarifies the twinning mechanism in HCP crystals and opens up opportunities for further researches.

摘要

利用高分辨率透射电子显微镜（HRTEM）研究了变形Mg-3Al-1Zn（AZ31）镁合金中{10 [化学式：见原文] 2}孪晶界（TB）的原子结构。通过将TB的晶格结构与先前建立的模型进行比较，在TB处发现了一种特殊的原子组合，这里命名为原胞（PCs）。从而验证了六方密堆积（HCP）晶体中孪晶的原胞重取向诱导机制。同时，讨论了PCs相邻层的取向差与TB宽度之间的关系。该机制的验证阐明了HCP晶体中的孪晶机制，并为进一步研究开辟了机会。