Local Chemical Order in High-Entropy Alloys

doi:10.11900/0412.1961.2020.00513

Acta Metall Sin

2021, Vol. 57

Issue (4): 413-424 DOI: 10.11900/0412.1961.2020.00513

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Local Chemical Order in High-Entropy Alloys

DING Jun(

), WANG Zhangjie(

)

State Key Laboratory of Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Cite this article:

DING Jun, WANG Zhangjie. Local Chemical Order in High-Entropy Alloys. Acta Metall Sin, 2021, 57(4): 413-424.

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Abstract

High-entropy alloys are designed based on the concept of multi-principle elements and high-configuration entropy. They exhibit excellent mechanical, high-temperature, and irradiation-tolerant properties, indicating their great potential for high-performance structural materials in the recent decade. Since the discovery of high-entropy alloys, most of the related research work was based on the classical assumption of ideal solid solution. However, recent investigation have showed the local chemical order in high-entropy alloys and how such atomic-level structure tunes the deformation mechanism, which has attracted significant attention. This study reviewed the recent progress in the theoretical description and experimental characterization of the local chemical order as well as its impact on the mechanical properties of high-entropy alloys. Besides, a brief perspective on the research of understanding and optimizing high-entropy alloys from the local chemical order is proposed.

Key words: high-entropy alloy local chemical order mechanical property

Received: 21 December 2020

ZTFLH:

TG139

Fund: National Natural Science Foundation of China(51971167);National Youth Talents Program

About author: WANG Zhangjie, associate professor, Tel: (029)82664764, E-mail: zhangjiewang@xjtu.edu.cn
DING Jun, professor, Tel: (029)82664764, E-mail: dingsn@xjtu.edu.cn

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00513 OR https://www.ams.org.cn/EN/Y2021/V57/I4/413

Fig.1 Schematics of local structural feature in high-entropy alloys (HEAs), metallic glasses, and conventional alloys^[43]

Fig.2 Schematic of typical atomic-level structure in HEAs

Fig.3 Characterizations of local chemical order in HEAs

Fig.4 Effect of local chemical order on the stacking fault energies in CrCoNi alloys

Fig.5 Planar dislocations slip influenced by local chemical order in CrCoNi alloys^[48]

Fig.6 Tensile test of polycrystalline CoCrFeMnNi high-entropy alloy^[77]

Fig.7 Strengthening induced by local chemical order^[44]

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