Nanoindentation study of size effect and loading rate effect on mechanical properties of a thin film metallic glass Cu49.3Zr50.7

Jian Jun Pang, Ming Jen Tan, K. M. Liew, Christopher Shearwood

    Research output: Contribution to journalArticlepeer-review

    39 Citations (SciVal)

    Abstract

    A binary metallic glass (MG) Cu49.3Zr50.7 in the form of thin film was successfully grown on a Si (1 0 0) substrate by magnetron sputtering. The mechanical properties, specifically, hardness and modulus at various peak loads and loading rates were characterized through instrumented nanoindentation. Unlike other metallic glasses showing an indentation size effect (ISE), the composition of this study does not have an ISE, which is phenomenologically the result of the negligible length scale according to the strain gradient plasticity model. The proportional specimen resistance model is applicable to the loaddisplacement behaviors and suggests that the frictional effect is too small to contribute to the ISE. The occurrence of plasticity depends on loading rates and can be delayed so that the displacement during the load holding segment increases logarithmically. In addition, the hardness and modulus are both dependent on the loading rates as well, i.e., they increase as the loading rate increases up to 0.1 mN/s and then hold constant, which is independent of creep time (≤100 s). These loading-rate-dependent behaviors are interpreted as the result of viscoelastic effect rather than free volume kinetics.

    Original languageEnglish
    Pages (from-to)340-346
    Number of pages7
    JournalPhysica B: Condensed Matter
    Volume407
    Issue number3
    Early online date4 Nov 2011
    DOIs
    Publication statusPublished - 1 Feb 2012

    Keywords

    • CuZr
    • Indentation size effect
    • Loading rate
    • Mechanical property
    • Metallic glass
    • Nanoindentation

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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