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Corrosion of high entropy alloys

journal contribution
posted on 2023-08-29, 23:03 authored by Y Qiu, S Thomas, MA Gibson, HL Fraser, N Birbilis
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.

History

Journal

npj Materials Degradation

Volume

1

Article number

ARTN 15

Location

Berlin, Germany

ISSN

2397-2106

eISSN

2397-2106

Language

English

Issue

1

Publisher

NATURE PORTFOLIO