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Grain Boundary Characters and Sliding of [0001] Symmetric Tilt Boundaries in Alumina

Published online by Cambridge University Press:  10 February 2011

Katsuyuki Matsunaga
Affiliation:
Institute of Engineering Innovation, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan.
Hitoshi Nishimura
Affiliation:
Department of Materials Science, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan.
Hiroyuki Muto
Affiliation:
Department of Materials Science, Faculty of Engineering, Toyohashi University of Technology, 1-1, Hibarigaoka, Tenpaku-cyo, Toyohashi, Aichi, 441-8580, Japan.
Takahisa Yamamoto
Affiliation:
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
Yuichi Ikuhara
Affiliation:
Institute of Engineering Innovation, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan.
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Abstract

Bicrystal experiments were performed to investigate atomic structures and high-temperature creep properties of [0001] symmetric tilt grain boundaries in Al2O3. Al2O3 bicrystals with Σ7, Σ31 and Σ39 boundaries were fabricated by a diffusion bonding technique, and their atomic arrangements at the grain boundary cores were analyzed by high-resolution transmission electron microscopy (HRTEM), in combination with static lattice calculations based on two-body ionic potentials. Compressive creep tests were also conducted to examine the behavior of grain boundary sliding for the above bicrystals. It was found that the behavior of grain boundary sliding depends on the grain boundary characters, whereas the trend of grain boundary sliding was not related to their Σ values. In contrast, HRTEM observations showed that the Σ31 boundary exhibiting the highest sliding rate has open spaces at the boundary core. Since grain boundary diffusion is expected to accommodate strains at grain boundary cores during sliding, it is likely that such open spaces give rise to high diffusivity at the grain boundary core, which results in the rapid grain boundary sliding of Σ31.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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