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Transient creep in fine-grained polycrystalline Al2O3 with Lu3+ ion segregation at the grain boundaries

Published online by Cambridge University Press:  26 November 2012

Hidehiro Yoshida ,
Yuichi Ikuhara  and
Taketo Sakuma
Hidehiro Yoshida*
Affiliation:
Graduate School of Frontier Sciences, Department of Advanced Materials Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Yuichi Ikuhara
Affiliation:
Engineering Research Institute, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Taketo Sakuma
Affiliation:
Graduate School of Frontier Sciences, Department of Advanced Materials Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The creep deformation in fine-grained polycrystalline Al2O3 is highly suppressed by the addition of 0.1 mol% LuO1.5. The transient creep behavior in Lu-doped Al2O3 was examined at the testing temperature of 1250–1350 °C, and the data were analyzed in terms of the effect of stress and temperature on the extent of transient time and strain. The experimental data on the transient creep in Lu-doped Al2O3 showed good agreement with the prediction from a time function of the transient and the steady-state creep associated with grain boundary sliding as well as an undoped one. The difference in the transient creep between Lu-doped and undoped Al2O3 can also be explained by the retardation of grain boundary diffusion due to the Lu3+ ions segregation in the grain boundaries.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 716 - 720
Copyright
Copyright © Materials Research Society 2001

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