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Atomic-scale evidence of chemical short-range order in CrCoNi medium-entropy alloy

文献类型：期刊论文

作者Zhou, Lingling5,6; Wang, Qi4; Wang, Jing6; Chen, Xuefei5,6; Jiang, Ping6; Zhou, Hao3; Yuan, Fuping5,6; Wu, Xiaolei5,6; Cheng, Zhiying2; Ma, En1
刊名ACTA MATERIALIA
出版日期2022-02-01
卷号224页码:11
关键词Chemical short-range order High-entropy alloy Microstructure
ISSN号1359-6454
DOI10.1016/j.actamat.2021.117490
通讯作者Wu, Xiaolei(xlwu@imech.ac.cn) ; Cheng, Zhiying(czy@tsinghua.edu.cn) ; Ma, En(maen@xjtu.edu.cn)
英文摘要High (or medium)-entropy alloys (H/MEAs) are complex concentrated solid solutions that may develop chemical short-range order (CSRO). In this regard, CrCoNi, the prototypical face-centered-cubic MEA, has recently kindled a debate in the H/MEA community, as it is uncertain if CSRO can possibly form in such a multi-principal-element solution, where no equilibrium or metastable intermetallic compounds have ever been seen or predicted. To answer this challenging question, here we present firm experimental evidence for the CSRO from electron diffraction as well as atomic-resolution chemical mapping, under an appropri-ate zone axis. We also develop a methodology to reliably determine the locations of atomic columns from the line scan profiles in the chemical maps, as well as a quantitative covariance-based correlation analysis of the column chemical compositions to reveal the spatial correlations between various atomic pairs. The detailed chemical information affirms the tendency for like-pair avoidance and unlike-pair preference, specifies the preferred atomic packing and plane stacking by the three constituent species, and suggests a proposed atomic configuration that constitutes the CSRO motif. The fraction of CSRO regions is mod-erately lowered after either plastic deformation or high-temperature heating. A comparison is also made with previous attempts to identify CSROs in H/MEAs. (c) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )
WOS关键词ELECTRON
资助项目Ministry of Science and Technology of China[2019YFA0209900] ; NSFC[11972350] ; NSFC[11890680] ; NSFC[11988102] ; Chinese Academy of Sciences[XDB22040503]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000788848600007
资助机构Ministry of Science and Technology of China ; NSFC ; Chinese Academy of Sciences
源URL[http://dspace.imech.ac.cn/handle/311007/89075]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Wu, Xiaolei; Cheng, Zhiying; Ma, En
作者单位1.Xi An Jiao Tong Univ, Ctr Alloy Innovat & Design CAID, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
2.Tsinghua Univ, Natl Ctr Electron Microscopy Beijing, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
3.Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
4.Sci & Technol Surface Phys & Chem Lab, POB 9-35, Jiangyou 621908, Peoples R China
5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Zhou, Lingling,Wang, Qi,Wang, Jing,et al. Atomic-scale evidence of chemical short-range order in CrCoNi medium-entropy alloy[J]. ACTA MATERIALIA,2022,224:11.
APA Zhou, Lingling.,Wang, Qi.,Wang, Jing.,Chen, Xuefei.,Jiang, Ping.,...&袁福平.(2022).Atomic-scale evidence of chemical short-range order in CrCoNi medium-entropy alloy.ACTA MATERIALIA,224,11.
MLA Zhou, Lingling,et al."Atomic-scale evidence of chemical short-range order in CrCoNi medium-entropy alloy".ACTA MATERIALIA 224(2022):11.

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来源：力学研究所

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