Direct observation of chemical short-range order in a medium-entropy alloy
文献类型:期刊论文
作者 | Chen XF(陈雪飞)5,6; Wang Qi4; Cheng Zhiying3; Zhu ML(朱鸣柳)6; Zhou Hao2; Jiang P(姜萍)6; Zhou LL(周玲玲)5,6; Xue QQ(薛琪琦)5,6; Yuan FP(袁福平)5,6; Zhu Jing2,3 |
刊名 | Nature |
出版日期 | 2021-04-28 |
卷号 | 592页码:712-716 |
DOI | 10.1038/s41586-021-03428-z |
英文摘要 | Complex concentrated solutions of multiple principal elements are being widely investigated as high- or medium-entropy alloys (HEAs or MEAs)1,2,3,4,5,6,7,8,9,10,11, often assuming that these materials have the high configurational entropy of an ideal solution. However, enthalpic interactions among constituent elements are also expected at normal temperatures, resulting in various degrees of local chemical order12,13,14,15,16,17,18,19,20,21,22. Of the local chemical orders that can develop, chemical short-range order (CSRO) is arguably the most difficult to decipher and firm evidence of CSRO in these materials has been missing thus far16,22. Here we discover that, using an appropriate zone axis, micro/nanobeam diffraction, together with atomic-resolution imaging and chemical mapping via transmission electron microscopy, can explicitly reveal CSRO in a face-centred-cubic VCoNi concentrated solution. Our complementary suite of tools provides concrete information about the degree/extent of CSRO, atomic packing configuration and preferential occupancy of neighbouring lattice planes/sites by chemical species. Modelling of the CSRO order parameters and pair correlations over the nearest atomic shells indicates that the CSRO originates from the nearest-neighbour preference towards unlike (V−Co and V−Ni) pairs and avoidance of V−V pairs. Our findings offer a way of identifying CSRO in concentrated solution alloys. We also use atomic strain mapping to demonstrate the dislocation interactions enhanced by the CSROs, clarifying the effects of these CSROs on plasticity mechanisms and mechanical properties upon deformation. |
分类号 | 一类 |
语种 | 英语 |
WOS记录号 | WOS:000645368900011 |
其他责任者 | Zhu jing, Wu Xiaolei, Ma En |
源URL | [http://dspace.imech.ac.cn/handle/311007/86258] |
专题 | 力学研究所_非线性力学国家重点实验室 |
通讯作者 | Zhu Jing; Wu XL(武晓雷); Ma En |
作者单位 | 1.Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, China. 2.Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China. 3.National Center of Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing, China. 4.Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, China. 5.School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China. 6.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China. |
推荐引用方式 GB/T 7714 | Chen XF,Wang Qi,Cheng Zhiying,et al. Direct observation of chemical short-range order in a medium-entropy alloy[J]. Nature,2021,592:712-716. |
APA | Chen XF.,Wang Qi.,Cheng Zhiying.,Zhu ML.,Zhou Hao.,...&Ma En.(2021).Direct observation of chemical short-range order in a medium-entropy alloy.Nature,592,712-716. |
MLA | Chen XF,et al."Direct observation of chemical short-range order in a medium-entropy alloy".Nature 592(2021):712-716. |
入库方式: OAI收割
来源:力学研究所
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