Experimental characterization of shear transformation zones for plastic flow of bulk metallic glasses

D. Pan, A. Inoue, T. Sakurai, M. W. Chen

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    372 Citations (Scopus)

    Abstract

    We report experimental characterization of shear transformation zones (STZs) for plastic flow of bulk metallic glasses (BMGs) based on a newly developed cooperative shearing model [Johnson WL, Samwer K (2005) A universal criterion for plastic yielding of metallic glasses with a (T/Tg) 2/3 temperature dependence. Phys Rev Lett 95: 195501]. The good agreement between experimental measurements and theoretical predictions in the STZ volumes provides compelling evidence that the plastic flow of metallic glasses occurs through cooperative shearing of unstable STZs activated by shear stresses. Moreover, the ductility of BMGs was found to intrinsically correlate with their STZ volumes. The experiments presented herein pave a way to gain a quantitative insight into the atomic-scale mechanisms of BMG mechanical behavior.

    Original languageEnglish
    Pages (from-to)14769-14772
    Number of pages4
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume105
    Issue number39
    DOIs
    Publication statusPublished - 2008 Sep 30

    Keywords

    • Cooperative shearing model
    • Mechanical property
    • Nanoindentation
    • Shear band
    • Strain rate sensitivity

    ASJC Scopus subject areas

    • General

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