Grain boundary characters and sliding of [0001] symmetric tilt boundaries in alumina

Katsuyuki Matsunaga, Hitoshi Nishimura, Hiroyuki Muto, Takahisa Yamamoto, Yuichi Ikuhara

    Research output: Contribution to journalConference articlepeer-review

    1 Citation (Scopus)

    Abstract

    Bicrystal experiments were performed to investigate atomic structures and high-temperature creep properties of [0001] symmetric tilt grain boundaries in Al2O3. Al2O3 bicrystals with Σ7, Σ31 and Σ39 boundaries were fabricated by a diffusion bonding technique, and their atomic arrangements at the grain boundary cores were analyzed by high-resolution transmission electron microscopy (HRTEM), in combination with static lattice calculations based on two-body ionic potentials. Compressive creep tests were also conducted to examine the behavior of grain boundary sliding for the above bicrystals. It was found that the behavior of grain boundary sliding depends on the grain boundary characters, whereas the trend of grain boundary sliding was not related to their Σ values. In contrast, HRTEM observations showed that the Σ31 boundary exhibiting the highest sliding rate has open spaces at the boundary core. Since grain boundary diffusion is expected to accommodate strains at grain boundary cores during sliding, it is likely that such open spaces give rise to high diffusivity at the grain boundary core, which results in the rapid grain boundary sliding of Σ31.

    Original languageEnglish
    Pages (from-to)85-90
    Number of pages6
    JournalMaterials Research Society Symposium - Proceedings
    Volume778
    Publication statusPublished - 2003 Dec 1
    EventMechanical Properties Derived from Nanostructuring Materials - San Francisco, CA, United States
    Duration: 2003 Apr 222003 Apr 25

    ASJC Scopus subject areas

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

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