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Discontinuous Coarsening of Tetragonal Precipitates in Partially Stabilized Zirconia Induced by Diffusional Coherency Strain under Applied Stress
Author(s) -
Kim JeongJoo,
Park Chan,
Kim DohYeon,
Yoon Duk N.,
Shapiro Alexander
Publication year - 1990
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.1151-2916.1990.tb04272.x
Subject(s) - materials science , tetragonal crystal system , precipitation , perpendicular , diffusion , stress (linguistics) , phase (matter) , strain rate , strain (injury) , cubic zirconia , surface energy , composite material , crystallography , thermodynamics , chemistry , geometry , medicine , ceramic , linguistics , physics , mathematics , philosophy , organic chemistry , meteorology
When partially stabilized zirconia with 6 mol% MgO and 4 mol% CaO is aged at 1450°C, intragranular precipitation occurs and concurrently the boundaries between the grains migrate, forming a Ca‐enriched precipitate‐free cubic phase and large tetragonal precipitates behind them. At these compositions and temperature the boundary migration is rapid and shows the characteristics of a discontinuous coarsening. A uniaxial compressive stress applied to this specimen during the aging treatment increases or decreases the migration rate of the boundaries parallel or perpendicular to the stress axis, respectively, in agreement with the prediction that a compressive coherency strain due to the diffusion of Ca atoms is produced at the surface of the retreating grains and drives the migration. The diffusional coherency strain energy is thus expected to be the dominant driving force for the discontinuous coarsening in this solid.