In situ observation of crack propagation in magnesium oxide ceramics

K. Matsunaga, S. Ii, C. Iwamoto, T. Yamamoto, Yuichi Ikuhara

    研究成果: Article査読

    21 被引用数 (Scopus)

    抄録

    In situ TEM straining experiments were performed for MgO ceramics in order to investigate the crack propagation behaviour. Using a micro-indenter driven accurately by a piezo actuator, cracks were introduced into MgO single crystals and polycrystals. In MgO single crystals, cleavage fracture along the (010) plane occurred, and the atomic structure of the crack walls were found to contain a number of square-shaped atomic steps. In contrast, cracks in polycrystalline MgO propagated along the grain boundaries, and crack deflection was observed at the triple grain junctions. It was found that a number of dislocations were generated around the triple junctions where the crack was deflected. The above results indicate that dislocation nucleation and/or emission play an important role in the crack propagation processes, even in brittle MgO.

    本文言語English
    ジャーナルNanotechnology
    15
    6
    DOI
    出版ステータスPublished - 2004 6月 1

    ASJC Scopus subject areas

    • バイオエンジニアリング
    • 化学 (全般)
    • 材料科学(全般)
    • 材料力学
    • 機械工学
    • 電子工学および電気工学

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