Dynamic plasticity and failure of high-purity alumina under shock loading

M. W. Chen, J. W. McCauley, D. P. Dandekar, N. K. Bourne

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    113 Citations (Scopus)

    Abstract

    High-resolution electron microscopic study of high-purity AD995 alumina, softly recovered from conventional shock loading experiments, is discussed. The transition point from elastic to inelastic response prior to failure during shock loading, known as Hugoniot elastic limit (HEL), was used to estimate the important parameters in the characterization of dynamic mechanical properties of ceramics. The alumina samples were recovered intact, but it showed a visual evidence of extensive microscopic cracks. The deformation and failure mechanism operating in shock-loaded alumina were investigated using scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental observation of the deformation behavior from dislocation activity in the vicinity of grain boundaries to deformation twinning, provides an evidence of micromechanism responsible for shock-induced global plastic deformation in AD995 alumina.

    Original languageEnglish
    Pages (from-to)614-618
    Number of pages5
    JournalNature Materials
    Volume5
    Issue number8
    DOIs
    Publication statusPublished - 2006 Aug 21

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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  • Cite this

    Chen, M. W., McCauley, J. W., Dandekar, D. P., & Bourne, N. K. (2006). Dynamic plasticity and failure of high-purity alumina under shock loading. Nature Materials, 5(8), 614-618. https://doi.org/10.1038/nmat1689