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Microstructure, Mechanical Properties, and High-Temperature Oxidation Behavior of Al0.3CoCrFeNiWx High Entropy Alloys

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Abstract

A series of Al0.3CoCrFeNiWx (x=0, 0.2, 0.3, and 0.5) high entropy alloys were designed. The effect of W addition on microstructure, mechanical behavior, and high-temperature oxidation was systematically investigated. It is indicated that the addition of W element promoted the structural transformation of as-cast Al0.3CoCrFeNiWx HEAs from single FCC to FCC + μ, and the volume fraction of μ phase increased as the W content increased. The yield strength of the alloys was enhanced with increasing W content, which could be attributed to solid solution and second phase strengthening. Oxidation studies were performed on the HEAs at 800 °C for 100 hours. Protective external Cr2O3 layer and internal Al2O3 formed in the investigated HEAs. With increasing W content, a higher mass gain was obtained. This could be explained by the relatively decreased Cr content in the as-cast alloy as well as the depletion of Cr element in the underlying alloy caused by μ phase. The results in our work could provide clues for the development of new HEAs.

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Acknowledgments

This work was financially supported by City University of Hong Kong Strategic Research Grants [Project Numbers: 7005081 and 7005238].

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Correspondence to Chan Hung Shek.

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Qin, X., Shek, C.H. Microstructure, Mechanical Properties, and High-Temperature Oxidation Behavior of Al0.3CoCrFeNiWx High Entropy Alloys. Metall Mater Trans A 53, 2768–2779 (2022). https://doi.org/10.1007/s11661-022-06706-1

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