Partial dislocation configurations in a low-angle boundary in α-Al2O3

E. Tochigi, N. Shibata, A. Nakamura, T. Yamamoto, Y. Ikuhara

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    18 Citations (Scopus)

    Abstract

    The dislocation structures of a low-angle tilt grain boundary in alumina bicrystal were investigated by transmission electron microscopy. The grain boundary was found to consist of two regions: an area with pairs of partial dislocations and an area with groups of odd numbered partial dislocations (multiple-partial-structure). Eight kinds of multiple-partial-structures were found in the fabricated grain boundary. The Burgers vectors of each partial dislocation in the grain boundary can be distinguished by dark-field imaging, and thus the arrangement of partial dislocations in the multiple-partial-structures are determined. It is concluded that a slight twist component of the boundary is the origin of the characteristic multiple-partial-structures.

    Original languageEnglish
    Pages (from-to)2015-2021
    Number of pages7
    JournalActa Materialia
    Volume56
    Issue number9
    DOIs
    Publication statusPublished - 2008 May 1

    Keywords

    • Alumina (α-AlO)
    • Dark-field image
    • Dislocation
    • Grain boundary
    • 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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