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Anelastic and plastic relaxation in polycrystalline alumina and single-crystal sapphire

Published online by Cambridge University Press:  31 January 2011

Ken'ichi Ota  and
Giuseppe Pezzotti
Ken'ichi Ota
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Ibaraki-shi, Mihogaoka 8–1, Osaka 561, Japan
Giuseppe Pezzotti
Affiliation:
Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan
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Abstract

Internal friction and torsional creep behaviors of high-purity single-crystal sapphire and three polycrystalline aluminas with different grain sizes have been measured up to very high temperature. The hexagonal c -axis-oriented sapphire specimen was tested at frequencies of 10–13 Hz, up to melting point (i.e., ∼2323 K). No relaxation peak was found and the exponential background curve was discussed in analogy to that of the hexagonal single-crystal ice reported in previous literature. The internal friction curves of the polycrystalline specimens were constituted by the superposition of a background component, of plastic nature, and a broad anelastic grain-boundary peak. These curves were markedly shifted to lower temperatures as compared to that of sapphire: the higher the shift, the smaller the average grain size. Also, the intensity of the grain-boundary peak decreased with increase in grain size. In the polycrystalline specimens, both creep and internal-friction background data fit the same Arrhenius plot, the slope corresponding to an activation energy of 200 kJ/mol. These data provide evidence for the occurrence of anelastic relaxation at the grain boundary and for the plastic nature of the internal-friction background in Al2O3 ceramics.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 11 , November 1996 , pp. 2785 - 2789
Copyright
Copyright © Materials Research Society 1996

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