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Grain Boundary Structure and Sliding of Alumina Bicrystals

Published online by Cambridge University Press:  10 February 2011

Y. Ikuhara ,
T. Watanabe ,
T. Yarnamoto ,
T. Saito ,
H. Yoshida  and
T. Sakuma
Y. Ikuhara
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, [email protected]
T. Watanabe
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, [email protected]
T. Yarnamoto
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, [email protected]
T. Saito
Affiliation:
Japan Fine Ceramics Center, 2-4-1, Mustuno, Atsuta-ku, Nagoya Sakyo-ku, Kyoto 606-01, Japan
H. Yoshida
Affiliation:
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
T. Sakuma
Affiliation:
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Abstract

Alumina bicrystals were fabricated by a hot joining technique at 1500°C in air to obtain ten kinds of [0001] symmetric tilt grain boundaries which included small angle, CSL and high angle grain boundaries. Their grain boundary structures were investigated by high-resolution electron microscopy (HREM), and the respective grain boundary energies were systematically measured by a thermal grooving technique. It was found that grain boundary energy strongly depended on the grain boundary characters, e.g., there were large energy cusps at low Σ CSL grain boundaries. But, main part of grain boundary energy is likely to be due to the strain energy around the grain boundary, and the contribution of atomic configuration is not so large. Small angle grain boundaries were consisted of an array of partial dislocation with Burgers vector of 1/3[1100] to form the stacking faults between the dislocations. The behavior of grain boundary sliding was also investigated for typical grain boundaries by high-temperature creep test at 1400°C. As the result, the occurrence of grain boundary sliding was found to depend on the grain boundary atomic structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 125
Copyright
Copyright © Materials Research Society 2000

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