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

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    283 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)212-215
    Number of pages4
    JournalScience
    Volume311
    Issue number5758
    DOIs
    Publication statusPublished - 2006 Jan 13

    ASJC Scopus subject areas

    • General

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  • Cite this

    Buban, J. P., Matsunaga, K., Chen, J., Shibata, N., Ching, W. Y., Yamamoto, T., & Ikuhara, Y. (2006). Grain boundary strengthening in alumina by rare earth impurities. Science, 311(5758), 212-215. https://doi.org/10.1126/science.1119839