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Morphology of Tetragonal Precipitates in Partially Stabilized ZrO 2
Author(s) -
LANTERI V.,
MITCHELL T. E.,
HEUER A. H.
Publication year - 1986
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.1151-2916.1986.tb04793.x
Subject(s) - tetragonal crystal system , equiaxed crystals , materials science , morphology (biology) , crystallography , oblate spheroid , anisotropy , surface energy , eutectic system , strain energy , lattice (music) , cubic zirconia , mineralogy , condensed matter physics , microstructure , crystal structure , thermodynamics , composite material , chemistry , optics , physics , geology , ceramic , paleontology , atomic physics , finite element method , acoustics
Tetragonal ( t ) ZrO 2 precipitates in Mg‐, Ca‐, and Y‐partially‐stabilized ZrO 2 (Mg‐PSZ, Ca‐PSZ, Y‐PSZ) have different habit planes and different morphologies. These differences arise because of differences in lattice parameters of precipitate and cubic ( c ) ZrO 2 matrix in the three systems. The approximate {001} habit plane and oblate spheroid precipitate morphology observed in Mg‐PSZ are explained in terms of anisotropic elasticity using the theory of Khachaturyan. The aspect ratio of ∼5 of these particles is used to calculate a c/t interfacial energy of ∼0.15 J·m –2 . The aligned equiaxed precipitates observed in Ca‐PSZ and the twinned colonies observed in Y‐PSZ can also be explained using this theory and arise from interactions between strain fields during coarsening; the aligned particles in Ca‐PSZ may actually represent an intermediate state before the formation of colonies in this system.