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An investigation of the sinter-forging characteristics of alumina-magnesia composites: Implications for superplasticity

Shah, SR and Chokshi, AH (1997) An investigation of the sinter-forging characteristics of alumina-magnesia composites: Implications for superplasticity. In: Materials Science Forum, Superplasticity in Advanced Materials - ICSAM-97 (243). pp. 381-385.

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Official URL: http://www.scientific.net/MSF.243-245.381

Abstract

It is well known that the addition of a small quantity of magnesia to alumina prevents abnormal grain growth, and the conventional method of producing fully dense alumina with an equiaxed microstructure is to introduce <0.1 wt% magnesia to alumina. In addition to solute drag, grain growth can be limited also by second phase particles. Superplasticity in alumina-based ceramics can be enhanced by limiting grain growth. Furthermore, the introduction of low energy interfaces in a two phase microstructure can also retard early fracture. In the present study on an alumina-10 wt% magnesia composite, the magnesia reacts with alumina to form a spinel phase. The experimental results indicate that the addition of magnesia retards grain growth and also leads to the formation of low energy interfaces, both of which are likely to promote superplasticity in the composite.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Transtec Publications Ltd.
Keywords: Alumina;magnesia;creep;grain growth;interface energy.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 27 Aug 2009 04:03
Last Modified: 27 Aug 2009 04:03
URI: http://eprints.iisc.ernet.in/id/eprint/18337

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