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Compression Creep Characteristics of 8-mol%-Yttria-Stabilized Cubic-Zirconia

Sudhir, B and Chokshi, Atul H (2001) Compression Creep Characteristics of 8-mol%-Yttria-Stabilized Cubic-Zirconia. In: Journal of the American Ceramic Society, 84 (11). pp. 2625-2632.

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Abstract

Constant stress compression creep tests were conducted on 8-mol%-yttria-stabilized cubic-zirconia (8YCZ) over stress (\sigma), temperature, and grain-size ranges from \sim 20 to 300 MPa,1673 to 1773 K, and 4 to 8 _m, respectively. Creep data were analyzed in terms of the relationship \dot{\epsilon}, x \sigma^n where \dot{\epsilon} is the strain rate and n the stress exponent. Although the experimental data yielded a stress exponent of n \approx2, analysis of the results with compensation of significant concurrent grain growth revealed that the true stress exponent was n \approx1. The results were consistent with deformation by the Coble creep mechanism. Experiments at stresses greater than \sim 100 Mpa revealed a transition from grain-size-dependent Coble diffusion creep to grain- ize-independent intragranular dislocation creep.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Ceramic Society
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Dec 2008 13:45
Last Modified: 19 Sep 2010 04:53
URI: http://eprints.iisc.ernet.in/id/eprint/16675

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