4.4 Article

twin nucleation at prismatic/basal boundary in hexagonal close-packed metals

期刊

PHILOSOPHICAL MAGAZINE
卷 99, 期 20, 页码 2584-2603

出版社

TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2019.1637031

关键词

Grain boundary; molecular dynamic simulations; deformation twinning; titanium; interfacial structures

资金

  1. National Natural Science Foundation of China (NSFC) [11872139]
  2. NSFC [51327805, 51421001]

向作者/读者索取更多资源

This paper examines {10} twin nucleation and growth under uniaxial tension at the prismatic/basal boundary through both molecular dynamics simulations and continuum mechanics modelling. Our results show that two disconnection dipoles exist on every intrinsic prismatic plane of the crystal which constructs the prismatic/basal boundary. Only one of the two disconnection dipoles is at the nucleus of {10} twins. The disconnection is activated and glides plane-by-plane along the direction throughout twin growth. The prismatic plane of the matrix is converted to the basal plane of the twin during the sliding of the disconnection. It is also predicted that a twin nucleates when the local gradient of elastic-energy or the average elastic-energy difference along the prismatic/basal boundary exhibit a sharp increase. Furthermore, the critical strain for twin nucleation can be obtained with the aid of local energy-based descriptors, when viewing twin nucleation as an instability phenomenon. Simulations suggest that both the local gradient and spatial average of elastic-energy difference are fundamental quantities behind the onset of twin nucleation at the prismatic/basal grain boundary in hexagonal close-packed metals under uniaxial loadings. Furthermore, results from our simulations and mechanics model, provide the position and the critical strain of the {10} twin nucleation at the prismatic/basal boundary.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据