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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)2768–2779
Journal / PublicationMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume53
Issue number7
Online published9 May 2022
Publication statusPublished - Jul 2022

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.

Citation Format(s)

Microstructure, Mechanical Properties, and High-Temperature Oxidation Behavior of Al0.3CoCrFeNiWx High Entropy Alloys. / Qin, Xiaomeng; Shek, Chan Hung.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 53, No. 7, 07.2022, p. 2768–2779.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review