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    Deformation-induced phase transformation in 4H-SiC nanopillars

    Access Status
    Fulltext not available
    Authors
    Chen, B.
    Wang, J.
    Zhu, Y.
    Liao, X.
    Lu, Chunsheng
    Mai, Y.
    Ringer, S.
    Ke, F.
    Shen, Y.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Chen, B. and Wang, J. and Zhu, Y. and Liao, X. and Lu, C. and Mai, Y. and Ringer, S. et al. 2014. Deformation-induced phase transformation in 4H-SiC nanopillars. Acta Materialia. 80: pp. 392-399.
    Source Title
    Acta Materialia
    DOI
    10.1016/j.actamat.2014.07.055
    ISSN
    1359-6454
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/47807
    Collection
    • Curtin Research Publications
    Abstract

    The deformation behaviour of single-crystal SiC nanopillars was studied by a combination of in situ deformation transmission electron microscopy and molecular dynamics simulations. An unexpected deformation-induced phase transformation from the 4H hexagonal structure to the 3C face-centred cubic structure was observed in these nanopillars at room temperature. Atomistic simulations revealed that the 4H to 3C phase transformation follows a stick–slip process with initiation and end stresses of 12.1–14.0 and 7.9–9.0 GPa, respectively. The experimentally measured stress of 9–10 GPa for the phase transformation falls within the range of these theoretical upper and lower stresses. The reasons for the phase transformation are discussed. The finding sheds light on the understanding of phase transformation in polytypic materials at low temperature.

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