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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.45  No.7 (2004)  >  pp.2122-2127

MATERIALS TRANSACTIONS
<<Previous article Vol.45  No.7 (2004)   pp.2122 - 2127 Next article>>

High Temperature Deformation Behavior of [0001] Symmetrical Tilt Σ7 and Σ21 Grain Boundaries in Alumina Bicrystals

Satoru Hanyu1), Hitoshi Nishimura1), Katsuyuki Matsunaga2), Takahisa Yamamoto3), Yuichi Ikuhara2) and Taketo Sakuma3)
1) Department of Materials Science, School of Engineering, The University of Tokyo
2) Institute of Engineering Innovation, The University of Tokyo
3) Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo


High temperature deformation behavior of [0001] symmetrical tilt grain boundaries of Al2O3 was investigated by using bicrystals. Four kinds of the grain boundaries Σ7/{4510}, Σ21/{4510}, Σ7/{2310} and Σ21/{2310} were selected in the present study, and compressive mechanical tests were performed at 1450°C in air to investigate the sliding behavior of the respective boundaries. It was found that, stresses readily increased with increasing strains for all specimens during compression tests, but the bicrystals showed abrupt sliding along the grain boundary planes to fracture. Among the boundaries studied, Σ7/{4510} exhibited the highest resistance to the grain boundary sliding. The other boundaries showed similar sliding resistance, and yet the stress and strain values at their failure were much smaller than those of Σ7/{4510}. In order to understand the mechanism of the sliding behavior of the respective boundaries, the grain boundary core structures and their atomic densities were examined, based on the structure models obtained in our previous studies. It was found that Σ7/{4510} having the highest sliding resistance showed a larger atomic density at the core, as compared to the others. Therefore, the observed sliding resistance of the boundaries is closely related to the detailed atomic structures at the grain boundary cores.


Keyword:
alumina, bicrystal, transmission electron microscopy, grain boundary structure, grain boundary sliding

Received: January 30, 2004
Accepted: April 21, 2004 , Published online: June 24, 2005
Copyright (c) 2005 The Japan Institute of Metals

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