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Creep deformation in a 3mol% Y2O3-Stabilized Tetragonal Zirconia

Published online by Cambridge University Press:  10 February 2011

K. Morita ,
K. Hiraga  and
Y. Sakka
K. Morita
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, lbaraki 305-0047, Japan
K. Hiraga
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, lbaraki 305-0047, Japan
Y. Sakka
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-shi, lbaraki 305-0047, Japan
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Abstract

The high temperature deformation behavior of a 3mol% yttria-stabilized tetragonal zirconia (3Y-TZP) is examined. The analysis of creep strain rate, which was monitored directly with an optical extensometer and corrected for the current grain size, reveals a sigmoidal feature in the true stress-creep rate relationship. At lower stresses, a stress exponent n of ∼1.6 incorporated with a grain size exponent of 2.0 suggests the intervention of a lattice diffusion creep mechanism. For higher stresses where n ∼2.7, evidence of intragranular dislocation activities suggests that dislocations may play an important role in the accommodation process for grain boundary sliding in 3Y-TZP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 93
Copyright
Copyright © Materials Research Society 2000

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