High temperature deformation and densification in alumina-yttria composites

Krishnamurthy, S. ; Chokshi, Atul H. (1996) High temperature deformation and densification in alumina-yttria composites Materials Science Forum, 243-245 . pp. 369-374. ISSN 0255-5476

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Official URL: http://www.scientific.net/MSF.243-245.369

Related URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.243-245.369

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 streβ exponent for creep deformation.

Item Type:Article
Source:Copyright of this article belongs to Trans Tech Publications Inc.
Keywords:Aluminium; Creep; Grain Growth; Sinter Forging; Yttria
ID Code:84161
Deposited On:24 Feb 2012 11:13
Last Modified:24 Feb 2012 11:13

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