Effect of B4C on microstructure and properties of high-entropy alloy

doi:10.13251/j.issn.0254-6051.2020.06.036

Abstract

Abstract: High entropy alloy matrix composites B₄C/FeCoNiCrAl and B₄C/FeCoNiCrCu were prepared by microwave sintering process. The effects of different contents of B₄C on the microstructure and properties of high-entropy alloy were investigated. The results show that the addition of B₄C increases the lattice distortion of matrix alloy to a certain extent. The microstructure of the alloy consists of a high-entropy alloy basement region, a boride region formed by decomposition of boron carbide, and a carbide region. The boride of the body-centered cubic FeCoNiCrAl high-entropy alloy is needle-like, and the high-entropy alloy boride structure of the face-centered cubic structure FeCoNiCrCu is block-shaped, which is related to the atomic size difference in the alloy system. B₄C can significantly improve the strength and hardness of the alloy, and the plasticity decreases slightly. The 4% B₄C/FeCoNiCrAl alloy composite presents the highest hardness and compressive strength values of 627.1 HV0.5 and 1836 MPa, respectively, but the plasticity is poor, and the compression ratio is only 11%. The hardness and strength of the 4% B₄C/FeCoNiCrCu alloy composite are only 249.3 HV0.5 and 1413 MPa, which are lower than that of 4% B₄C/FeCoNiCrAl alloy composite, but the plasticity is good and the compression ratio can reach 35%.

Key words: B₄C, high-entropy alloy, microwave sintering, microstructure, properties

CLC Number:

TG113
TG146

Zhang Jie, Cheng Xiaonong, Luo Rui, Liu Ming. Effect of B₄C on microstructure and properties of high-entropy alloy[J]. Heat Treatment of Metals, 2020, 45(6): 173-177.

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Effect of B₄C on microstructure and properties of high-entropy alloy

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