BO Le; GAO Xiaoyu; NING Zhiliang; WANG Li; SUN Jianfei; ZHANG Zhenjiang; HUANG Yongjiang

doi:10.7498/aps.74.20250518

Abstract

High-entropy alloy (HEA) microfibers exhibit promising prospects in microscale high-tech applications due to their exceptional mechanical properties and stability. However, the strength-plasticity tradeoff largely hinders their further industrial applications. Heat treatment can optimize the mechanical properties of HEA microfibers. However, the traditional heat treatment (CHT) faces challenges in accurately adjusting the microstructures in a short period of time, while also being prone to grain coarsening, which can affect performance. In this study, an electric current treatment (ECT) technique is used to finely modulate the properties of cold-drawn CoCrFeNi high-entropy alloy microfibers on a microscale (~70 μm in diameter), the effects of thermal and athermal effects during ECT on microstructure and mechanical properties are systematically investigated through electron back scatter diffraction, transmission electron microscopy, and synchrotron radiation. A model of recrystallization, nucleation and growth of HEA microfibers is established. Compared with CHT, the synergistic effects of electron wind force and Joule heating during ECT significantly accelerate recrystallization kinetics, yielding finer and more homogeneous grains with a great decrease in dislocation density, and finally lead to better mechanical properties. The ECT-processed HEA microfibers achieve a yield strength in a range from 400 to 2033 MPa and a tensile elongation reaching 53%, which are much higher than those of CHT samples. These results demonstrate that the ECT is effective for optimizing the microstructure and properties of HEA microfibers, and can also provide both a theoretical foundation and technical guidance for fabricating high-performance metallic microfibers.

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Corresponding author: ZHANG Zhenjiang, river18202@163.com ; HUANG Yongjiang, yjhuang@hit.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 52371106).

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电流密度 /(A·mm^–2)	标记	稳定温度/K	传统热处理温度/K	标记
100	ECT100	623	623	CHT623
120	ECT120	747	747	CHT747
140	ECT140	850	850	CHT850
160	ECT160	943	943	CHT943
180	ECT180	1013	1013	CHT1013
200	ECT200	1075	1075	CHT1075

DownLoad: CSV

样品	晶粒尺寸/μm	样品	晶粒尺寸/μm
ECT100	—	CHT623	—
ECT120	1.5±0.2	CHT747	1.3±0.1
ECT140	1.9±0.2	CHT850	1.7±0.2
ECT160	2.5±0.7	CHT943	3.1±0.6
ECT180	4.6±1.1	CHT1013	5.8±1.3
ECT200	15.0±3.1	CHT1075	16.8±4.0

DownLoad: CSV

样品	屈服强度/ MPa	均匀延伸率/ %	样品	屈服强度/ MPa	均匀延伸率/ %
As drawn	1930	0	—	—	—
ECT100	2033	0	CHT623	1680	0
ECT120	1480	7	CHT747	1490	0
ECT140	1130	43	CHT850	1050	3
ECT160	800	52	CHT943	715	13.5
ECT180	550	39	CHT1013	500	41
ECT200	400	19	CHT1075	360	28

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Vol. 74, Issue 13 - 2025-07-05

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