Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal

doi:10.1016/j.actamat.2019.08.056

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	Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal
	Zhang, Yongchao 1,2; Du, Kui 1; Zhang, Wei 3; Du, Beining 4; Qi, Dongqing 1; Li, Wenqing 1,2; Song, Miao 5; Sheng, Liyuan 4; Ye, Hengqiang 1
刊名	ACTA MATERIALIA
	2019-10-15
卷号	179 页码:396-405
关键词	Laves phases HAADF STEM Dislocations Faults Short-range ordering
ISSN号	1359-6454
DOI	10.1016/j.actamat.2019.08.056
通讯作者	Du, Kui(kuidu@imr.ac.cn)
英文摘要	Dislocation behaviors, which determine mechanical properties of materials, are generally believed to be controlled by long-range lattice translational order. For intermetallic compounds, however, their structures are often closely related to atomic environments, with the short-range configurations possibly deviating from the long-range translational order. Thus, how dislocations move in these crystals is obscure. Here, we resolve the shear deformation, dominated by atomic-environment polyhedra, in a representative topologically close-packed phase with (Cr,Ni,Al)(2)Nb stoichiometry, using aberration corrected scanning transmission electron microscopy combining with atomic-resolution energy dispersive X-ray spectroscopy. Dislocations there have Burgers vectors deviating from slip planes and surprisingly move by switching between two different slip planes. Long-range diffusion and local composition variation assist the dislocation motion, as demonstrated by high temperature quasi-static and room temperature impact deformations. These discoveries demonstrate the defining role of shortrange configuration in the deformation of complex structured intermetallics and shed light on the novel behavior of dislocations. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51771203] ; National Natural Science Foundation of China[51521091] ; National Key Research and Development Program of China[2017YFA0700701] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[QYZDJ-SSW-JSC024]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000488417400035
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/135682]
专题	金属研究所_中国科学院金属研究所
通讯作者	Du, Kui
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 3.Univ Tokyo, Sch Engn, Dept Mat Engn, Tokyo, Japan 4.Peking Univ, Shenzhen Inst, Shenzhen 518055, Peoples R China 5.Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99352 USA
推荐引用方式 GB/T 7714	Zhang, Yongchao,Du, Kui,Zhang, Wei,et al. Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal[J]. ACTA MATERIALIA,2019,179:396-405.
APA	Zhang, Yongchao.,Du, Kui.,Zhang, Wei.,Du, Beining.,Qi, Dongqing.,...&Ye, Hengqiang.(2019).Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal.ACTA MATERIALIA,179,396-405.
MLA	Zhang, Yongchao,et al."Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal".ACTA MATERIALIA 179(2019):396-405.