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    Nano-scale elastic-plastic properties and indentation-induced deformation of single crystal 4H-SiC

    Access Status
    Fulltext not available
    Authors
    Nawaz, A.
    Mao, W.
    Lu, Chunsheng
    Shen, Y.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Nawaz, A. and Mao, W. and Lu, C. and Shen, Y. 2017. Nano-scale elastic-plastic properties and indentation-induced deformation of single crystal 4H-SiC. Journal Of The Mechanical Behavior Of Biomedical Materials. 66: pp. 172-180.
    Source Title
    Journal Of The Mechanical Behavior Of Biomedical Materials
    DOI
    10.1016/j.jmbbm.2016.11.013
    ISSN
    1751-6161
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/23175
    Collection
    • Curtin Research Publications
    Abstract

    The nanoscale elastic-plastic response of single crystal 4H-SiC has been investigated by nanoindentationwith a Berkovich tip. The hardness (H) and elastic modulus (E) determined in the load-independent region were 36±2 GPa and 413±8 GPa, respectively. The indentation size effect (ISE) of hardness within an indentation depth of 60 nm was systematically analyzed by the Nix-Gao model. Pop-in events occurring at a depth of ~23 nm with indentation loads of 0.60-0.65 mN were confirmed to indicate the elastic-plastic transition of the crystal, on the basis of the Hertzian contact theory and Johnson's cavity model. Theoritically calculated maximum tensile strength (13.5 GPa) and cleavage strength (33 GPa) also affirms the deformation due to the first pop-in rather than tensile stresses. Further analyses of deformation behavior across the indent was done in 4H-SiC by a combined technique of focused ion beam and transmission electron microscope, revealing that slippage occurred in the (0001) plane after indentation.

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