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High temperature deformation and densification in alumina-yttria composites

Krishnamurthy, S and Chokshi, AH (1997) High temperature deformation and densification in alumina-yttria composites. In: 1997 International Conference on Superplasticity in Advanced Materials (ICSAM-97), JAN 29-31, 1997, Indian Institute of Science, Bangalore, India, pp. 369-374.

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Abstract

Pinning by second phase particles offers a potent means for limiting grain growth and enhancing superplasticity in alumina-based ceramics. In the present study, a colloidal technique was used to produce green bodies of alumina-yttria composites; at elevated temperatures, the yttria particles react with alumina to produce YAG particles. The densification and high temperature deformation characteristics of alumina-YAG composites were studied using conventional free sintering and sinter-forging, which involves the application of a compressive stress without any lateral constraints. It is shown that the YAG particles retard both densification and grain growth. The experiments indicate also that the presence of YAG particles does not significantly alter the stress exponent for creep deformation.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Superplasticity In Advanced Materials.
Keywords: Alumina;yttria;creep;sinter-forging;grain growth.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 12 Aug 2009 05:26
Last Modified: 12 Aug 2009 05:26
URI: http://eprints.iisc.ernet.in/id/eprint/19316

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