Effect of Cr content on microstructure and properties of CrxMoNbTiZr high-entropy alloys

doi:10.13251/j.issn.0254-6051.2023.01.004

Abstract

Abstract: Cr_xMoNbTiZr high-entropy alloys (x=0, 0.5, 1, 1.5) were prepared by vacuum arc melting. X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), microhardness tester and electrochemical workstation were used to study the effect of Cr content on the crystallographic structure, microstructure, hardness and corrosion resistance of the high-entropy alloy. The results show that the addition of Cr makes the alloy change from a single-phase BCC structure to a dual-phase BCC structure of Zr-rich phase and Mo-Nb-rich phase. With the increase of Cr content, there is also a Cr-rich Laves phase precipitate in the Zr-rich phase. The Cr_1.5MoNbTiZr alloy has the highest hardness of 765.53 HV, which is due to the combined effect of the second phase precipitation strengthening, solution strengthening and high-entropy alloy lattice distortion. The addition of Cr increases the corrosion tendency of the Cr_xMoNbTiZr high entropy alloy in 3.5%NaCl solution (mass fraction), but reduces the corrosion rate of this high entropy alloy. Meanwhile, it is found that the addition of Cr has a critical value to ensure the pitting resistance of the alloy, beyond which the alloy is more prone to pitting.

Key words: high entropy alloy, vacuum arc melting, microstructure, corrosion resistance

CLC Number:

TG146

Guo Jingping, Xiao Yifeng, Wu Liang, Zhang Qiankun, Liu Ziyi, He Pengcong. Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys[J]. Heat Treatment of Metals, 2023, 48(1): 18-22.

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Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys

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