Sink property of metallic glass free surfaces

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

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number8877
    JournalScientific reports
    Volume5
    DOIs
    Publication statusPublished - 2015 Mar 16

    ASJC Scopus subject areas

    • General

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