Design for Thermal Stability of Nanocrystalline Alloys Based on High-Entropy Effects

doi:10.11900/0412.1961.2020.00494

Acta Metall Sin

2021, Vol. 57

Issue (4): 403-412 DOI: 10.11900/0412.1961.2020.00494

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Design for Thermal Stability of Nanocrystalline Alloys Based on High-Entropy Effects

WANG Yihan, YUAN Yuan, YU Jiabin, WU Honghui, WU Yuan(

), JIANG Suihe, LIU Xiongjun, WANG Hui(

), LU Zhaoping

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

WANG Yihan, YUAN Yuan, YU Jiabin, WU Honghui, WU Yuan, JIANG Suihe, LIU Xiongjun, WANG Hui, LU Zhaoping. Design for Thermal Stability of Nanocrystalline Alloys Based on High-Entropy Effects. Acta Metall Sin, 2021, 57(4): 403-412.

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Abstract

Nanocrystalline alloys (NAs) with nano-sized fine grains and high density of grain boundaries exhibit promising properties, such as high strength and hardness. However, industrial applications of NAs at high or even room temperature have been limited, owing to their thermal instability, which originates from the high proportion of grain boundaries in NAs. Recently, nanocrystalline high-entropy alloys (NC-HEAs) have emerged and have been rapidly developed, which are expected to alleviate thermal instability. In this study, design strategies for the thermal stability of NC-HEAs and related progress are investigated and summarized. In addition, the underlying mechanism for the high thermal stability of NC-HEAs is discussed by utilizing high-entropy effects, based on entropy engineering. These high-entropy design strategies may provide a new methodology for dramatically increasing the thermal stability of NAs.

Key words: high-entropy alloy nanocrystalline alloy thermal stability high-entropy effect

Received: 07 December 2020

ZTFLH:

TG430.40

Fund: National Natural Science Foundation of China(51921001);the Project of State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing(2019Z-01)

About author: WANG Hui, associate professor, Tel: (010)62332246, E-mail: wanghui@ustb.edu.cn
WU Yuan, professor, Tel: (010)62332246, E-mail: wuyuan@ustb.edu.cn

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	Articles by authors
	Yihan WANG
	Yuan YUAN
	Jiabin YU
	Honghui WU
	Yuan WU
	Suihe JIANG
	Xiongjun LIU
	Hui WANG
	Zhaoping LU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00494 OR https://www.ams.org.cn/EN/Y2021/V57/I4/403

Fig.1 Microstructural schematic of the progression from single crystal metal to nanocrystalline (NC) metal to NC-HEA (HEA—high-entropy alloy)^[19]

Fig.2 The designed nanostructured AlCoCuNi medium-entropy alloy (MEA) with stable dual phase by ultilizing entropy engineering (a-c)^[30]

Fig.3 The designed crystalline/amorphous dual-phase FeCoNiCrMn alloy with ultra-high hardness by ultilizing entropy engineering (d—grain size)^[31]

Fig.4 Room-temperature hardness, Young's modulus, and APT reconstructions of FeCoNiCrMn alloys with different grain sizes after isothermal heat treatments at 450^oC for various time^[61]

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