Structures of dissociated 〈1over(1, ̄) 0 0〉 dislocations and {1over(1, ̄) 0 0} stacking faults of alumina (α-Al2O3)

E. Tochigi, N. Shibata, A. Nakamura, T. Mizoguchi, T. Yamamoto, Yuichi Ikuhara

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    22 Citations (Scopus)

    Abstract

    An alumina (α-Al2O3) bicrystal with a {1over(1, ̄) 0 0}/〈1 1over(2, ̄) 0〉 2° low-angle grain boundary was fabricated by diffusion bonding, and the grain boundary was observed by high-resolution transmission electron microscopy (HRTEM). It was found that 1/3〈1over(1, ̄) 0 0〉 partial-dislocation triplets were periodically arrayed along the boundary. The atomic structure within the {1over(1, ̄) 0 0} stacking faults in between the partial-dislocation triplets was determined by HRTEM combined with first-principles calculations. We discuss the stacking fault structures and their excess energies in detail.

    Original languageEnglish
    Pages (from-to)208-215
    Number of pages8
    JournalActa Materialia
    Volume58
    Issue number1
    DOIs
    Publication statusPublished - 2010 Jan 1

    Keywords

    • Alumina (α-AlO)
    • Dislocation
    • Grain boundary
    • Stacking fault
    • Transmission electron microscopy (TEM)

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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