Grain boundary strengthening in alumina by rare earth impurities

J. P. Buban, K. Matsunaga, J. Chen, N. Shibata, W. Y. Ching, T. Yamamoto, Y. Ikuhara

    研究成果: Article査読

    309 被引用数 (Scopus)

    抄録

    Impurity doping often alters or improves the properties of materials. In alumina, grain boundaries play a key role in deformation mechanisms, particularly in the phenomenon of grain boundary sliding during creep at high temperatures. We elucidated the atomic-scale structure in alumina grain boundaries and its relationship to the suppression of creep upon doping with yttrium by using atomic resolution microscopy and high-precision calculations. We find that the yttrium segregates to very localized regions along the grain boundary and alters the local bonding environment, thereby strengthening the boundary against mechanical creep.

    本文言語English
    ページ(範囲)212-215
    ページ数4
    ジャーナルScience
    311
    5758
    DOI
    出版ステータスPublished - 2006 1 13

    ASJC Scopus subject areas

    • 一般

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