Progress of Cryogenic Deformation and Strengthening-Toughening Mechanisms of High-Entropy Alloys

doi:10.11900/0412.1961.2022.00598

Acta Metall Sin

2023, Vol. 59

Issue (6): 727-743 DOI: 10.11900/0412.1961.2022.00598

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Progress of Cryogenic Deformation and Strengthening-Toughening Mechanisms of High-Entropy Alloys

LIU Junpeng¹(

), CHEN Hao¹, ZHANG Chi¹, YANG Zhigang¹, ZHANG Yong²^,³, DAI Lanhong⁴

¹Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
²State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
³Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing 100083, China
⁴State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Cite this article:

LIU Junpeng, CHEN Hao, ZHANG Chi, YANG Zhigang, ZHANG Yong, DAI Lanhong. Progress of Cryogenic Deformation and Strengthening-Toughening Mechanisms of High-Entropy Alloys. Acta Metall Sin, 2023, 59(6): 727-743.

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Abstract

Owing to the multi-principal element and higher intrinsic configurational entropy, high-entropy alloys exhibit excellent mechanical and physicochemical performance, which has garnered extensive attention from researchers. By virtue of the excellent performances in terms of superior strength, ductility, toughness, impact resistance property, and adjustable phase stability, especially in cryogenic environments, high-entropy alloys have broad application prospects in fields such as deep-space exploration, low temperature superconducting, and the gas industry. In this paper, the deformation and strengthening-toughening mechanisms of high-entropy alloys are summarized by reviewing the cryogenic progress. Furthermore, the promising research directions of high-entropy alloys in cryogenic engineering application combined with the performance of traditional cryogenic materials are also presented.

Key words: high-entropy alloy cryogenic property deformation mechanism strengthening-toughening strategy

Received: 21 November 2022

ZTFLH:

TG139

Fund: National Key Research and Development Program of China(2022YFE0110800);National Key Research and Development Program of China(2021YFB3702300);National Natural Science Foundation of China(52101169);National Natural Science Foundation of China(52273280)

Corresponding Authors: LIU Junpeng, Tel:(010)62781646, E-mail: liujunpeng@mail.tsinghua.edu.cn

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	CHEN Hao
	ZHANG Chi
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	ZHANG Yong
	DAI Lanhong

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00598 OR https://www.ams.org.cn/EN/Y2023/V59/I6/727

Fig.1 Schematic of crystal structure in high-entropy alloy (HEA) with severe distortion^[3]

Fig.2 Tensile properties of CoCrFeNiMn HEA at room temperature and cryogenic condition after cryogenic rolling process^[9] (σ_b—ultimate tensile strength)

Fig.3 Dislocation configurations of Ni₃₀Co₃₀Fe₁₃Cr₁₅Al₆Ti₆ HEA after cryogenic deformation^[11]

Fig.4 Typical Lomer-Cottrell (L-C) lock in HEA during dislocation motion^[66]

Fig.5 Nano-twins in L1₂ precipitate in Al_3.6Co_27.3Cr_18.2Fe_18.2Ni_27.3Ti_5.4 HEA after deformation at 77 K^[68]

Fig.6 Structure of short-range-order (SRO) in B-doped Fe₄₀Mn₄₀Co₁₀Cr₁₀ HEA after cryogenic deformation^[93]

Fig.7 Feature of twins and phase transition in CoCrFeNi HEA after deformation at 4.2 K^[10]

Fig.8 Ashby map of tensile properties at 4.2 K among HEA with other cryogenic metallic materials^[10]

Fig.9 Schematic diagram of cryogenic work-hardening mechanisms in Fe-based medium-entropy alloy (GB—grain boundary, SB—shear band)^[95]

Fig.10 Morphology, mechanical properties, and microstructure evolutions of Fe₅₅Co_17.5Cr_12.5Ni₁₀Mo₃C₂ HEA^[91]

Fig.11 Eutectic structure of AlCoCrFeNi_2.1 HEA^[98]

Fig.12 Deformation feature of dual-phases in Al₁₉Co₂₀-Fe₂₀Ni₄₁ eutectic high-entropy alloy (EHEA) at cryogenic environment^[100]
(a, b) structure features of L1₂ and B2 phase after tensile test (strain ε ≈ 12%) at 77 K, which forest-dislocation hardening occurs in the L1₂ phase (c) structure feature of L1₂ and B2 phase after tensile test (ε ≈ 16%) at 293 K (Inset shows cooperative deformation of the adjacent B2 phase)

Fig.13 Tensile properties of hot-drawing CoCrNi wire at room and cryogenic temperatures^[49] (σ_y—yield strength, ε_u—uniform elongation, ε_f—fracture strain)

Fig.14 Microstructures of AlCoCrFeNi_2.1 EHEA wire during tensile test at 77 K^[102]

Fig.15 Ashby maps showing the yield strength (a) and ultimate tensile strength (b) vs elongation to failure for different HEAs at 77 K (CoCr-FeNiMn alloy^{[4,9,16,50,51,77,81,82]}; PS—precipitate-strengthening^{[11,48,67,68,80,91,97]}; TRIP—phase transformation induced plasticity^{[42,63,69,70,86,88-90,92-95]}; eutectic HEA^[99,100]; TiZrHfNbTa HEA^[41]; HEA-wire^[8,49,102]; CoCrNi medium-entropy alloy (MEA)^{[7,10,40,45,53,59]}; SP^{— single-phase^{[61,71,72,75,79]}; DP—dual-phase^[73,84,96])}

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