High temperature deformation behavior of [0001] symmetrical tilt Σ7 and Σ21 grain boundaries in alumina bicrystals

Satoru Hanyu, Hitoshi Nishimura, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    High temperature deformation behavior of [0001] symmetrical tilt grain boundaries of Al2O3 was investigated by using bicrystals. Four kinds of the grain boundaries Σ7/{45̄10}, Σ21/(45̄10}, Σ21/{23̄10} and Σ21/{23̄10} were selected in the present study, and compressive mechanical tests were performed at 1450°C in air to investigate the sliding behavior of the respective boundaries. It was found that, stresses readily increased with increasing strains for all specimens during compression tests, but the bicrystals showed abrupt sliding along the grain boundary planes to fracture. Among the boundaries studied, Σ7/{45̄10} exhibited the highest resistance to the grain boundary sliding. The other boundaries showed similar sliding resistance, and yet the stress and strain values at their failure were much smaller than those of Σ7/{45̄10}. In order to understand the mechanism of the sliding behavior of the respective boundaries, the grain boundary core structures and their atomic densities were examined, based on the structure models obtained in our previous studies. It was found that Σ7/{45̄10} having the highest sliding resistance showed a larger atomic density at the core, as compared to the others. Therefore, the observed sliding resistance of the boundaries is closely related to the detailed atomic structures at the grain boundary cores.

    Original languageEnglish
    Pages (from-to)2122-2127
    Number of pages6
    JournalMaterials Transactions
    Volume45
    Issue number7
    DOIs
    Publication statusPublished - 2004 Jul

    Keywords

    • Alumina
    • Bicrystal
    • Grain boundary sliding
    • Grain boundary structure
    • Transmission electron microscopy

    ASJC Scopus subject areas

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

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