Morphology of tetragonal precipitates in partially stabilized ZrO/sub 2/

Journal Article · Tue Jul 01 00:00:00 EDT 1986 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1986.tb04793.x· OSTI ID:7195124

Lanteri, V; Mitchell, T E; Heuer, A H

Tetragonal (t) ZrO/sub 2/ precipitates in Mg-, Ca-, and Y-partially-stabilized ZrO/sub 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/sub 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 approx. = of these particles is used to calculate a c/t interfacial energy of approx. =0.15 J . m/sup -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 interaction 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.

• Research Organization: Dept. of Metallurgy and Materials Science, Case Western Reserve Univ., Cleveland, OH 44106
• OSTI ID: 7195124
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:7; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METALS
ANISOTROPY
ASPECT RATIO
CALCIUM
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELASTICITY
ELEMENTS
MAGNESIUM
MECHANICAL PROPERTIES
METALS
MORPHOLOGY
OXIDES
OXYGEN COMPOUNDS
PARTICLES
STABILIZATION
STRAINS
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES