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

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英文篇名：Interaction of {11■2} twin variants in hexagonal close-packed titanium 作者：Xiaocui ; Li ; Jingwei ; Li ; Bo ; Zhou ; Mingchao ; Yu ; Manling ; Sui 英文作者：Xiaocui Li;Jingwei Li;Bo Zhou;Mingchao Yu;Manling Sui;Institute of Microstructure and Property of Advanced Materials,Beijing University of Technology; 英文关键词：HCP titanium;;{11■2} twin-twin interaction;;EBSD analysis;;TEM observation 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Institute of Microstructure and Property of Advanced Materials,Beijing University of Technology; 出版日期：2019-04-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 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) 语种：英文; 页：CLKJ201904026 页数：7 CN：04 ISSN：21-1315/TG 分类号：198-204

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 properties. In 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 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}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}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.
        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 properties. In 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 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} 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} 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.

引文

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