HRTEM study on grain boundary atomic structures related to the sliding behavior in alumina bicrystals

K. Matsunaga, H. Nishimura, S. Hanyu, H. Muto, T. Yamamoto, Y. Ikuhara

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Al 2 O 3 bicrystals containing [0 0 0 1] symmetric tilt Σ7 grain boundaries with different grain boundary planes of {4 5̄ 1 0} and {2 3̄ 1 0} were fabricated by diffusion bonding, and the grain boundary structures were investigated by high-resolution transmission electron microscopy (HRTEM). From HRTEM observations combined with atomistic simulations, it was found that the grain boundaries exhibited characteristic atomic arrangements, and the Σ7/{2 3̄ 1 0} boundary contained large open spaces at its core. In compressive creep experiments for the bicrystals, these boundaries showed quite different creep behavior, although they have the same Σ value. The measured sliding rate of Σ7/{2 3̄ 1 0} was much larger than that of Σ7/{4 5̄ 1 0}, which may be due to the open core structure formed in Σ7/{2 3̄ 1 0}.

    Original languageEnglish
    Pages (from-to)75-79
    Number of pages5
    JournalApplied Surface Science
    Volume241
    Issue number1-2 SPEC. ISS.
    DOIs
    Publication statusPublished - 2005 Feb 28

    Keywords

    • Alumina
    • Creep
    • Grain boundary
    • HRTEM

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Physics and Astronomy(all)
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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