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A Comparative Study of Superplastic Deformation and Cavitation Failure in a Yttria Stabilized Zirconia and a Zirconia Alumina Composite

Published online by Cambridge University Press:  16 February 2011

A. H. Chokshi ,
D. J. Schissler ,
T.-G. Nieh  and
J. Wadsworth
A. H. Chokshi
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of alifornia, San Diego, La Jolla, CA 92093
D. J. Schissler
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of alifornia, San Diego, La Jolla, CA 92093
T.-G. Nieh
Affiliation:
Research and Development Division, Lockheed Missiles and Space Company, Palo Alto, CA 94304
J. Wadsworth
Affiliation:
Research and Development Division, Lockheed Missiles and Space Company, Palo Alto, CA 94304
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Abstract

A fine grained yttria stabilized zirconia and a zirconia composite containing 20% alumina exhibit superplastic characteristics, with optimum elongations to failure of ≥500%. There is microstructural evidence for deformation enhanced grain growth and concurrent cavitation in both of these superplastic ceramics. Grain sizes after superplastic deformation may be several times larger than the initial grain size, and the level of cavitation can attain values as high as ≥30% under some experimental conditions. This report presents in a comparative format some recent experimental results on the microstructural aspects of superplastic deformation and concurrent cavitation in these superplastic ceramics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 379
Copyright
Copyright © Materials Research Society 1990

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References

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