Surface segregation in Cr-Mn-Fe-Co-Ni high entropy alloys

Alberto Ferrari*, Fritz Körmann

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    36 Citations (Scopus)
    53 Downloads (Pure)

    Abstract

    The reactivity of the surface of multicomponent metals such as High Entropy Alloys (HEAs) is rapidly gaining importance for corrosion and catalytic applications, but the mechanisms of surface segregation in these complex materials are poorly understood. Here we investigate with ab initio calculations the segregation thermodynamics in the magnetic Cr-Mn-Fe-Co-Ni HEA in vacuum, in the presence of O at the surface, and in the oxide phase. We predict a weak segregation of Ni for Cr-, Mn-, and Fe-rich alloys in vacuum and a very strong segregation of Cr and Mn upon exposure to O.

    Original languageEnglish
    Article number147471
    Number of pages7
    JournalApplied Surface Science
    Volume533
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Cantor alloy
    • CrMnFeCoNi
    • High entropy alloys
    • Surface segregation

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