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Compression Creep Characteristics of 8‐mol%‐Yttria‐Stabilized Cubic‐Zirconia
Author(s) -
Sudhir B.,
Chokshi Atul H.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01063.x
Subject(s) - creep , materials science , diffusion creep , grain size , cubic zirconia , stress (linguistics) , dislocation creep , dislocation , composite material , strain rate , yttria stabilized zirconia , compression (physics) , stress relaxation , metallurgy , grain boundary , microstructure , ceramic , linguistics , philosophy
Constant stress compression creep tests were conducted on 8‐mol%‐yttria‐stabilized cubic‐zirconia (8YCZ) over stress (ς), temperature, and grain‐size ranges from ∼20 to 300 MPa, 1673 to 1773 K, and 4 to 8 μm, respectively. Creep data were analyzed in terms of the relationship [epsivdot] ∝ς n , where [epsivdot] is the strain rate and n the stress exponent. Although the experimental data yielded a stress exponent of n & 2, analysis of the results with compensation of significant concurrent grain growth revealed that the true stress exponent was n ∼ 1. The results were consistent with deformation by the Coble creep mechanism. Experiments at stresses greater than ∼100 MPa revealed a transition from grain‐size‐dependent Coble diffusion creep to grain‐size‐independent intragranular dislocation creep.