Dislocation structures in a {1̄104}/〈112̄0〉 low-angle tilt grain boundary of alumina (α-Al2O3)

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

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    An alumina (α-Al2O3) bicrystal with a (1̄104)/[112̄0] 2o low-angle tilt grain boundary was fabricated by diffusion bonding at 1500 °C in air, and the grain boundary was observed by transmission electron microscopy (TEM). High-resolution TEM observations revealed that the grain boundary consists of at least two kinds of dislocations. One is a perfect dislocation which has a Burgers vector of 1/31̄21̄0. The other is dissociated into two partial dislocations with a stacking fault on the (0001) plane, and each partial dislocation has a 1/6[1̄101] edge component. It is suggested from structural considerations that the dissociated-dislocation pair originates from a b = 1/3[022̄1] perfect dislocation (i.e., 1/3[022̄1] → 1/6[022̄1] + 1/6[022̄1]). This dissociation produces a stacking fault in the anion sublattice. The stacking fault energy is estimated to be roughly 1.3 Jm -2 based on the elastic theory. The authors discuss the dislocation structures and the stacking fault formed on the (0001) plane in detail.

    Original languageEnglish
    Pages (from-to)4428-4433
    Number of pages6
    JournalJournal of Materials Science
    Volume46
    Issue number12
    DOIs
    Publication statusPublished - 2011 Jun 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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