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Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal
Zhang, Yongchao1,2; Du, Kui1; Zhang, Wei3; Du, Beining4; Qi, Dongqing1; Li, Wenqing1,2; Song, Miao5; Sheng, Liyuan4; Ye, Hengqiang1
Corresponding AuthorDu, Kui(kuidu@imr.ac.cn)
2019-10-15
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume179Pages:396-405
AbstractDislocation 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.
KeywordLaves phases HAADF STEM Dislocations Faults Short-range ordering
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences
DOI10.1016/j.actamat.2019.08.056
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000488417400035
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/135683
Collection中国科学院金属研究所
Corresponding AuthorDu, Kui
Affiliation1.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
Recommended Citation
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.
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