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Structural Evolution and Mechanical and Magnetic Properties of Nonequiatomic CoFe2NiMn0.3Alx (0.25 ≤ x ≤ 1.00) High-Entropy Alloys

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Abstract

CoFe2NiMn0.3Alx (x = 0.25, 0.50, 0.75, 1.00) alloys were prepared using the arc melting method, and their crystal structure, microstructure, and mechanical properties were systematically studied. The results show that a greater Al content beneficially alters the crystal structure of the alloys from a single FCC phase to a mixture of FCC + BCC phases. With increasing Al content, the volume fraction of the BCC phase increases steadily, whereas the volume fraction of the FCC phase substantially decreases. With increasing Al content, the yield strength and hardness of the CoFe2NiMn0.3Alx alloys increases, whereas their ductility gradually decreases. Among the studied alloys, that with x = 0.75 exhibits both high strength and good ductility and its yield strength, fracture strength, and fracture strain are 1100 MPa, 2335 MPa, and 33.24%, respectively. Measurements of magnetic properties indicated that the saturation magnetization increases from 90 emu g−1 for the Al0.25 alloy to 148 emu g−1 for the Al1.00 alloy. The results show that the CoFe2NiMn0.3Alx high-entropy alloys are potential candidates to serve as magnetic materials in industrial applications.

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Acknowledgment

This research work was funded by the National Natural Science Foundation of China (Nos. 51301125, 51971166, 51904218), the Natural Science Basic Research Program of Shaanxi Province (No. 2020JM-557), and the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201811).

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  1. School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, Shaanxi, People’s Republic of China

    Mao Zhang, Lijuan Yao, Man Zhu, Yongqin Liu & Zengyun Jian

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  1. Mao Zhang
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Correspondence to Man Zhu.

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Zhang, M., Yao, L., Zhu, M. et al. Structural Evolution and Mechanical and Magnetic Properties of Nonequiatomic CoFe2NiMn0.3Alx (0.25 ≤ x ≤ 1.00) High-Entropy Alloys. J. of Materi Eng and Perform 30, 1472–1478 (2021). https://doi.org/10.1007/s11665-020-05411-7

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