Microstructure and properties of WTaVNbMo refractory high-entropy alloy layer on W surface

doi:10.13251/j.issn.0254-6051.2023.05.002

Abstract

Abstract: WTaVNbMo refractory high-entropy alloy layers were prepared on the surface of pure tungsten by double-glow plasma surface metallurgy technology with powder metallurgy W₁₈Ta₁₈V₂₀Nb₁₈Mo₂₆ alloy as source target. The temperature of workpiece was 1200 ℃, and the voltage difference between the source and cathode was 300 V, 400 V and 500 V, respectively. The microstructure and phase composition of the alloy layers were examined by scanning electron microscope with attached energy dispersive spectrometer and X-ray diffractometer. The hardness and corrosion resistance of the alloy layers were tested by microhardness tester and electrochemical workstation. The irradiation resistance of the alloy layer was simulated by SRIM software. The results show that the WTaVNbMo high-entropy alloy layers with BCC structure are formed on the surface of pure tungsten under different voltage differences. When the voltage difference is 400 V, the thickness of alloy layer is more than 100 μm. The alloy layer prepared under voltage difference of 500 V has uniform surface, compact structure and the highest hardness, which can reach 1635 HV0.05. The corrosion resistance is good, and the self-corrosion current density decreases by nearly two orders of magnitude compared with that of the W substrate. The irradiation simulation results show that compared with pure tungsten, the damage range of the high-entropy alloy layer is more concentrated, the projected range is shorter, the electronic stopping power is greater, and the ionization loss rate is faster.

Key words: high-entropy alloy layer, double-glow plasma surface metallurgy technology, hardness, corrosion resistance, irradiation simulation

CLC Number:

TG146.4

Huang Tianyang, Zheng Jiasheng, Tian Linhai, Lin Naiming, Wang Zhenxia, Qin Lin, Wu Yucheng. Microstructure and properties of WTaVNbMo refractory high-entropy alloy layer on W surface[J]. Heat Treatment of Metals, 2023, 48(5): 6-11.

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