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)


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
Issue number9
Publication statusPublished - 2008 May
Externally publishedYes


  • 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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