Corrosion of high entropy alloys

Yao Qiu, Sebastian Thomas, Mark A. Gibson, Hamish L. Fraser, Nick Birbilis*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

383 Citations (Scopus)

Abstract

High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

Original languageEnglish
Article number15
Journalnpj Materials Degradation
Volume1
Issue number1
DOIs
Publication statusPublished - Dec 2017
Externally publishedYes

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