Cavity development during creep deformation in alumina with a bimodal grain size distribution

Chokshi, Atul H. ; Porter, John R. (1987) Cavity development during creep deformation in alumina with a bimodal grain size distribution Journal of the American Ceramic Society, 70 (3). pp. 197-202. ISSN 0002-7820

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1151-...

Related URL: http://dx.doi.org/10.1111/j.1151-2916.1987.tb04957.x

Abstract

An alumina sample, codoped with equimolar proportions of magnesia and zirconia, exhibited a bimodal grain size distribution after hot-pressing. Flexural creep experiments were performed on this material at temperatures of 1673 and 1773 K in air. Inspection of the deformed specimens revealed extensive creep cavitation, with cavities developing preferentially in the coarse-grained regions. The nucleation, growth, and interlinkage of the cavities led to the formation of cracks. Crack growth occurred in the coarse-grained regions by the linkage of cavities with the crack tip. However, several cracks were observed to terminate after extending up to a fine-grained region of a specimen. A model has been developed to rationalize the observation that preferential cavitation occurs in the coarse-grained regions of a specimen undergoing creep deformation.

Item Type:Article
Source:Copyright of this article belongs to American Ceramic Society.
ID Code:22432
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