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| Shear deformation determined by short-range configuration of atoms in topologically close-packed crystal | |
| Zhang, Yongchao; Du, Kui; Zhang, Wei; Du, Beining; Qi, Dongqing; Li, Wenqing; Song, Miao; Sheng, Liyuan; Ye, Hengqiang | |
| 2019-10-15 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 179Pages:396-405 |
| Abstract | 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. |
| Keyword | Laves phases HAADF STEM Dislocations Faults Short-range ordering |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000488417400035 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/80697 |
| Collection | 中国科学院金属研究所 |
| 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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