Interaction of {11■2} twin variants in hexagonal close-packed titanium

作     者：Xiaocui Li Jingwei Li Bo Zhou Mingchao Yu Manling Sui 

作者机构：Institute of Microstructure and Property of Advanced MaterialsBeijing University of Technology 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术(英文版))

年 卷 期：2019年第35卷第4期

页      面：660-666页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Grants Nos.11374028 and U1330112) the Key Project of Beijing Natural Science Foundation(No.KZ201310005002) 

主　　题：HCP titanium {11■2} twin-twin interaction EBSD analysis TEM observation 

摘      要：As multiple{11■2}twin variants are often formed during deformation in hexagonal close-packed(hcp)titanium,the twin-twin interaction structure has a profound influence on mechanical *** this paper,the twin-twin interaction structures of the{11■2}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}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 *** the observed twin-twin pairs manifested a quilted-looking structure,which consists of the incoming twins being arrested by the obstacle ***,the quilted-looking{11■2}twin-twin boundary was revealed by TEM and high resolution TEM ***-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}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.