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    Determining the fracture strength and toughness of polarized GaN ceramics through the mean size of aggregates

    Access Status
    Fulltext not available
    Authors
    Qin, G.S.
    Guo, C.K.
    Zhao, M.H.
    Hu, X.
    Lu, Chunsheng
    Date
    2022
    Type
    Journal Article
    
    Metadata
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    Citation
    Qin, G.S. and Guo, C.K. and Zhao, M.H. and Hu, X. and Lu, C. 2022. Determining the fracture strength and toughness of polarized GaN ceramics through the mean size of aggregates. Materials Today Communications. 32: 104149.
    Source Title
    Materials Today Communications
    DOI
    10.1016/j.mtcomm.2022.104149
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/89345
    Collection
    • Curtin Research Publications
    Abstract

    The fracture strength and service life of ceramic components are closely related to their microstructures and intrinsic defects. In this paper, instead of pure data or curve fitting, the tensile strength and fracture toughness of GaN piezoelectric semi-conductive ceramics (PSCs) have been investigated based on the boundary effect model for describing the size effect of quasi-brittle materials. It is shown that the fracture toughness of polarized or depolarized GaN PSCs can be fully determined by the tensile strength and the mean size of their aggregates which follow a normal distribution. The fracture strength of polarized GaN PSCs is higher than that of depolarized ones due to the refining of aggregates. It implies that polarization can be well applied to improve the fracture resistance and durability of GaN and other PSCs.

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