Sink property of metallic glass free surfaces

Lin Shao, Engang Fu, Lloyd Price, Di Chen, Tianyi Chen, Yongqiang Wang, Guoqiang Xie, Don A. Lucca

    研究成果: Article査読

    17 被引用数 (Scopus)

    抄録

    When heated to a temperature close to glass transition temperature, metallic glasses (MGs) begin to crystallize. Under deformation or particle irradiation, crystallization occurs at even lower temperatures. Hence, phase instability represents an application limit for MGs. Here, we report that MG membranes of a few nanometers thickness exhibit properties different from their bulk MG counterparts. The study uses in situ transmission electron microscopy with concurrent heavy ion irradiation and annealing to observe crystallization behaviors of MGs. For relatively thick membranes, ion irradiations introduce excessive free volumes and thus induce nanocrystal formation at a temperature linearly decreasing with increasing ion fluences. For ultra-thin membranes, however, the critical temperature to initiate crystallization is about 100 K higher than the bulk glass transition temperature. Molecular dynamics simulations indicate that this effect is due to the sink property of the surfaces which can effectively remove excessive free volumes. These findings suggest that nanostructured MGs having a higher surface to volume ratio are expected to have higher crystallization resistance, which could pave new paths for materials applications in harsh environments requiring higher stabilities.

    本文言語English
    論文番号8877
    ジャーナルScientific reports
    5
    DOI
    出版ステータスPublished - 2015 3月 16

    ASJC Scopus subject areas

    • 一般

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