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    Nanoindentation-induced elastic-plastic transition and size effect in a-Al2O3(0001)

    Access Status
    Fulltext not available
    Authors
    Lu, Chunsheng
    Mai, Y.
    Tam, P.
    Shen, Y.
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Lu, Chunsheng and Mai, Yiu-Wing and Tam, P. and Shen, Y. 2007. Nanoindentation-induced elastic-plastic transition and size effect in a-Al2o3(0001). Philosophical Magazine Letters. 87 (6): pp. 409-415.
    Source Title
    Philosophical Magazine Letters
    DOI
    10.1080/09500830701203156
    ISSN
    0950-0839
    Faculty
    Faculty of Science and Engineering
    Department of Mechanical Engineering
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/7628
    Collection
    • Curtin Research Publications
    Abstract

    The mechanical properties of a-Al2O3(0001) have been investigated by using the technique of nanoindentation with a Berkovich indenter. Coupled with the Hertzian contact theory, a theoretical shear strength of 28 +- 2 GPa was determined from the onset of pop-in events on load-displacement curves during loading, and the intrinsic hardness 30 +- 3 GPa was obtained by analysis of the so-called indentation size effect, based on the concept of geometrically necessary dislocations. The predicted values of the shear strength, hardness, and elastic modulus are in good agreement with available experimental data. The importance of experimentally calibrating the area function over the contact depth range prior to nanoindentation tests is emphasized.

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