Microstructure and properties of WTaTiVCr high-entropy alloy layer on tungsten surface

doi:10.13251/j.issn.0254-6051.2022.01.031

Abstract

Abstract: WTaTiVCr high-entropy alloy composite metalized layer on the surface of tungsten was prepared by using double-glow plasma metalizing technology and adjusting the metalizing temperature, then the microstructure composition, mechanical properties, wear resistance and corrosion resistance of the metalized layer were analyzed by means of SEM, EDS, XRD, microhardness tester, reciprocating friction test and electrochemical corrosion test. The results show that when the metalizing temperature is 1150 ℃ and the voltage difference between the source and the cathode is 400 V, a composite metalized layer containing a diffusion layer and a deposition layer can be obtained, and the atomic fraction of each element in the diffusion layer area is W_0.38Ta_0.14Ti_0.2V_0.2Cr_0.08, where the phase structure is a single-phase BCC structure, that meets the requirements of high-entropy alloys. At the same time, the surface hardness of the metalized layer reaches about 1400 HV0.2, which is greatly improved compared to pure tungsten due to the strengthening mechanisms of solid solution strengthening and lattice distortion. In addition, the average friction coefficient of the metalized layer is 0.447, the wear rate is 3.43×10^-8 mm³/(N·mm), and the corrosion rate is 3.87 mg/(m²·h), which possesses a certain degree of wear resistance and corrosion resistance. In summary, the WTaTiVCr high-entropy alloy layer prepared by double-glow technology on the surface of tungsten can effectively improve the mechanical properties and corrosion resistance of the W substrate.

Key words: first wall material, WTaTiVCr high-entropy alloy, double-glow technology, wear resistance, corrosion resistance

CLC Number:

TGl46.4

Han Xiaohu, Tian Linhai, Wang Zhenxia, Huang Tianyang, Zheng Jiasheng, Wang Juzhuang, Tang Bing, Wu Yucheng. Microstructure and properties of WTaTiVCr high-entropy alloy layer on tungsten surface[J]. Heat Treatment of Metals, 2022, 47(1): 185-191.

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