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Superplastic Deformation Mechanisms in a Fine-Grained, Yttria-stabilized Tetragonal Zirconia Polycrystal (Y-TZP)

Published online by Cambridge University Press:  16 February 2011

T. G. Nieh  and
J. Wadsworth
T. G. Nieh
Affiliation:
Lockheed Missiles and Space Company, Research and Development Division, O/9310, B/204, 3251 Hanover Street, Palo Alto, CA 94304
J. Wadsworth
Affiliation:
Lockheed Missiles and Space Company, Research and Development Division, O/9310, B/204, 3251 Hanover Street, Palo Alto, CA 94304
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Abstract

Concurrent grain growth, and in particular, dynamic grain growth, was observed to take place during superplastic deformation of Y-TZP. As a result of this concurrent grain growth, the measured strain rate sensitivity was found to be lower than that measured under constantstructure conditions. In the present paper, data obtained from the superplastic deformation of YTZP under constant-structure conditions are presented. It is demonstrated that the strain rate sensitivity values are generally higher than 0.5, when measured from the grain size-compensated data; this result suggests a grain boundary sliding mechanism. Microstructures from samples prior to and after superplastic deformation reveal grains which are essentially equiaxed; this observation is also consistent with a grain boundary sliding mechanism. Both high-resolution images of grain boundary triple points using transmission electron microscopy, and fracture surface studies using Auger electron spectroscopy and X-ray photoelectron spectroscopy indicate that there is no evidence for the presence of glassy phases at grain boundaries in Y-TZP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 331
Copyright
Copyright © Materials Research Society 1990

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References

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