Heterogeneity in Chemical Distribution and Its Impact in High-Entropy Alloys

doi:10.11900/0412.1961.2020.00433

Acta Metall Sin

2021, Vol. 57

Issue (4): 393-402 DOI: 10.11900/0412.1961.2020.00433

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Heterogeneity in Chemical Distribution and Its Impact in High-Entropy Alloys

YU Qian(

), CHEN Yujie, FANG Yan

Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

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YU Qian, CHEN Yujie, FANG Yan. Heterogeneity in Chemical Distribution and Its Impact in High-Entropy Alloys. Acta Metall Sin, 2021, 57(4): 393-402.

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Abstract

High-entropy alloys (HEAs) or multiprincipal-element alloys have exceptional properties those may be better than the properties of conventional alloys and exhibit different deformation mechanisms. However, some issues pertaining to what may make HEAs distinct from the conventional alloys remain to be resolved. Many studies have found that heterogeneity in chemical distribution due to unique atomic features may be common in HEAs. Therefore, the relationship between the structure and properties cannot be explained completely by the traditional solid solution strengthening mechanism. In this short review, classified by their crystal structures, such as face-centered-cubic, body-centered-cubic, and dual-phase, studies on element distribution in HEAs, including concentration wave and short-range order, are summarized. The influence of heterogeneity in chemical distribution on dislocation behaviors and mechanical properties is described. Further, a brief perspective of the research directions for element distribution is proposed.

Key words: high entropy alloy concentration fluctuation short-range order deformation mechanism and mechanical property

Received: 30 October 2020

ZTFLH:

TG131

Fund: National Natural Science Foundation of China(51671168、51871197)

About author: YU Qian, professor, Tel: (0571)87953852, E-mail: 0014030@zju.edu.cn

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00433 OR https://www.ams.org.cn/EN/Y2021/V57/I4/393

Fig. 1 The model of traditional solid solution and the inhomogeneity of element distribution in high-entropy alloys (HEAs)

Fig.2 Atomic scale element distribution taken from EDS in CrCoNi-3W (a) and Ni-3W (b) alloys

Fig.3 Dislocation morphologies in different alloys

Fig.4 Heterogeneity in chemical distribution and corresponding dislocation behaviors in bcc HEAs

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