Relation between icosahedral short-range ordering and plastic deformation in Zr-Nb-Cu-Ni-Al bulk metallic glasses

Z. W. Zhu, L. Gu, G. Q. Xie, W. Zhang, A. Inoue, H. F. Zhang, Z. Q. Hu

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    42 Citations (Scopus)

    Abstract

    The relation between icosahedral short-range ordering (ISRO) and plastic deformation was investigated in Zr70-xNb xCu13.5Ni8.5Al8 (at.%, x = 0, 2, 4, 6, 7, 8, 10) bulk metallic glasses (BMG). The formation of icosahedral quasicrystal (I-phase) during the annealing process implies that ISRO widely exists in these materials. The degree of ISRO is thermodynamically evaluated to show that ISRO increases with increasing Nb content. Compression tests indicate that BMG with 0-7 at.% Nb possess similar unusual plastic deformability, which is attributed to ISRO-mediated local distribution of free volume (FV) and ISRO prompted deformation-induced crystallization. A proposed core-shell model coupled with transmission electron microscopy analysis demonstrates that the FV is distributed more heterogeneously with increasing ISRO, which is beneficial for multiplying the shear bands. Deformation-induced crystallization is facilitated, owing to the low interfacial energy of the nucleation and growth of the crystals attributed to ISRO in the amorphous matrix, which improves plasticity by consuming energy and the product altering the stress field in the amorphous matrix. Design of new ductile BMG is discussed in these strategies.

    Original languageEnglish
    Pages (from-to)2814-2822
    Number of pages9
    JournalActa Materialia
    Volume59
    Issue number7
    DOIs
    Publication statusPublished - 2011 Apr

    Keywords

    • Bulk metallic glasses
    • Crystallization
    • Free volume
    • Icosahedral short-range ordering
    • Plastic deformation

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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