Interaction of {11(2)over-bar2} twin variants in hexagonal close-packed titanium

被引:24
作者
Li, Xiaocui [1 ]
Li, Jingwei [1 ]
Zhou, Bo [1 ]
Yu, Mingchao [1 ]
Sui, Manling [1 ]
机构
[1] Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100124, Peoples R China
基金
中国国家自然科学基金; 北京市自然科学基金;
关键词
HCP titanium; {11(2)over-bar2} twin-twin interaction; EBSD analysis; TEM observation; PLASTIC-DEFORMATION; HCP METALS; GROWTH; DISLOCATIONS; NUCLEATION; BOUNDARY;
D O I
10.1016/j.jmst.2018.09.049
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
As multiple {11 (2) over bar2} twin variants are often formed during deformation in hexagonal close-packed (hcp) titanium, the twin-twin interaction structure has a profound influence on mechanical properties. In this paper, the twin-twin interaction structures of the {11 (2) over bar2} contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Formation of the {11 (2) over bar2} twin variants was found to deviate the rank of Schmid factor, and the non-Schmid behavior was explained by the high-angle grain boundary nucleation mechanism. All the observed twin-twin pairs manifested a quilted-looking structure, which consists of the incoming twins being arrested by the obstacle twins. Furthermore, the quilted-looking {11 (2) over bar2} twin-twin boundary was revealed by TEM and high resolution TEM observations. De-twinning, lattice rotation and curved twin boundary were observed in the obstacle twin due to the twin-twin reaction with the impinging twin. A twin-twin interaction mechanism for the {11 (2) over bar2} twin variants was proposed in terms of the dislocation dissociation, which will enrich the understanding for the propagation of twins and twinning-induced hardening in hcp metals and alloys. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:660 / 666
页数:7
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