Chemical short-range order in Fe50Mn30Co10Cr10 high-entropy alloy

被引:55
作者
Liu, D. [1 ,2 ]
Wang, Q. [3 ]
Wang, J. [1 ]
Chen, X. F. [1 ,2 ]
Jiang, P. [1 ]
Yuan, F. P. [1 ,2 ]
Cheng, Z. Y. [4 ]
Ma, E. [5 ]
Wu, X. L. [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
[3] Sci & Technol Surface Phys & Chem Lab, POB 9-35, Jiangyou 621908, Peoples R China
[4] Tsinghua Univ, Natl Ctr Electron Microscopy Beijing, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
[5] Xi An Jiao Tong Univ, Ctr Alloy Innovat & Design CAID, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源
MATERIALS TODAY NANO | 2021年 / 16卷
关键词
Chemical short-range order; High-entropy alloy; Spatially correlated distribution; Fe50Mn30Co10Cr10; ELECTRON-DIFFRACTION; TRANSFORMATION; DEFORMATION;
D O I
10.1016/j.mtnano.2021.100139
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Chemical short-range order (CSRO) is generally possible in concentrated solid solutions and currently of considerable interest for multi-principal element alloys. However, a convincing demonstration of CSRO has been challenging and achieved thus far only for ternary medium-entropy alloys such as VCoNi. Here, we report definitive proof of CSRO in a quaternary face-centered-cubic Fe50Mn30Co10Cr10 high-entropy alloy, acquired from systematic electron microscopy experiments. The evidence includes extra diffuse disks in nano-beam electron diffraction patterns, images in state-of-the-art aberration-corrected scanning transmission electron microscope, as well as compositional profiles across neighboring atomic planes/columns in atomic-resolution chemical maps. The CSRO regions are found to occupy an areal fraction of 20% and have dimensions on a sub-nanometer scale. This length scale, as well as the diffraction features of the CSRO, are different from those of intermetallic compound precipitates; as such, the CSRO is not a growing stage of a nucleated second phase, the precipitation of which has been dealt with previously in classical alloys. We further conducted a spatial correlation analysis of the concentrations in atomic columns in the chemical map, enabling us to uncover a general tendency toward nearest-neighbor chemical ordering, specifically, preference for unlike species (such as Fe-Mn) and avoidance for like-species (such as Fe-Fe). The persistence of this trend, the same as that found in VCoNi MEA, recently, is somewhat intriguing for a high-entropy alloy in which all the constituent elements are similar in atomic size and have rather a small enthalpy of mixing. (C) 2021 The Author(s). Published by Elsevier Ltd.
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页数:11
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