Interaction of {112¯2} twin variants in hexagonal close-packed titanium |
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基金项目: | This work was financially supported by the National Natural Science Foundation of China;the Key Project of Beijing Natural Science Foundation;The authors gratefully acknowledge Prof.Xiaoxing Ke for her English proofreading |
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摘 要: |
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收稿时间: | 6 April 2018 |
Interaction of {11(2)2} twin variants in hexagonal close-packed titanium |
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Authors: | Xiaocui Li Jingwei Li Bo Zhou Mingchao Yu Manling Sui |
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Affiliation: | Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China |
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Abstract: | 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 {112} contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Formation of the {112} 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 {112} 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 {112} 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. |
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Keywords: | HCP titanium EBSD analysis TEM observation |
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