Effect of Si on microstructure and high temperature oxidation resistance of high-entropy alloy coatings

doi:10.13251/j.issn.0254-6051.2021.08.009

Abstract

Abstract: Effect of Si content on microstructure, phase structure and high temperature oxidation resistance of the narrowband/broadband laser clad NiCoFeCrSi_xAlCuTiMoB_0.4 (x=1.0, 0.5) high-entropy alloy coatings was studied. The results show that the narrowband clad coating is mainly composed of simple BCC solid solution with dendritic microstructure. In the broadband coating, the phases transform to BCC solid solution with a small amount of B(Fe,Si)₃ and Cr₂B precipitates which are between dendrites, and the content of B(Fe,Si)₃ reduces with the decrease of Si content. After oxidizing at 800 ℃ for 50 h, the oxidation scale of the broadband clad coating is mainly composed of Cr-rich outer oxide layer and Al-rich inner oxide layer, and the increase of Si content improves the high temperature oxidation resistance of the coating, especially significantly reduces the thickness of internal oxide layer.

Key words: laser cladding, high-entropy alloy, microstructure, oxide layer

CLC Number:

TG174

Ma Zhizhen, Zhu Jiahao, Zhang Hui. Effect of Si on microstructure and high temperature oxidation resistance of high-entropy alloy coatings[J]. Heat Treatment of Metals, 2021, 46(8): 46-50.

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