Effect of sub-Tgannealing on the corrosion resistance of the Cu-Zr amorphous alloys

Sang Soo Shin, Hong Kyu Kim, Jae Chul Lee, Ik Min Park

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Despite the economy of material cost and excellent toughness of Cu-based amorphous alloys, especially Cu50Zr50, their poor corrosion resistance to a chloride medium limits their widespread applications. In this study, corrosion tests were performed on the Cu50Zr50amorphous alloy with different degrees of short-range order, which were prepared by annealing below the glass transition temperature (Tg). It was found that the corrosion resistance of amorphous alloys is improved to a significant level when the alloys were heated below Tg. Calorimetric studies showed that thermally activated relaxation process of created disorder, which occurs during sub-Tgannealing, is responsible for the improvement in the corrosion resistance. Molecular dynamics simulations performed on the Cu-Zr amorphous alloys demonstrated that the relaxation process of the alloys is associated with the formation of energetically stable icosahedra and icosahedron-like structures. Our study highlights the effects of sub-Tgannealing on the improvement in the corrosion resistance of the amorphous alloys from the viewpoint the relaxation process of the short-range orders.

    Original languageEnglish
    Pages (from-to)273-280
    Number of pages8
    JournalActa Metallurgica Sinica (English Letters)
    Volume31
    Issue number3
    DOIs
    Publication statusPublished - 2018 Mar

    Bibliographical note

    Publisher Copyright:
    © The Chinese Society for Metals and Springer-Verlag GmbH Germany 2017.

    Keywords

    • Amorphous alloys
    • Annealing
    • Corrosion
    • Electrochemical performance
    • Molecular dynamics

    ASJC Scopus subject areas

    • Metals and Alloys
    • Industrial and Manufacturing Engineering

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