Coarsening kinetics in Mg(Ca,Ti,Y)-partially-stabilized zirconias

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb04226.x· OSTI ID:7238035

Bateman, C A; Notis, M R ^[1]

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1. Dept. of Materials Science and Engineering, Lehigh Univ., Bethlehem, PA (US)

The coarsening kinetics of a magnesia-partially-stabilized zirconia with and without ternary additions of calcia, titania, or yttria at the 2 mol% level have been studied as a function of aging time at 1420{degrees}C. Addition of titania was found to markedly increase the coarsening rate and it is thought that this is due to a higher precipitate volume fraction in this system. Both calcia and yttria decreased the coarsening kinetics by a similar amount, probably due to both lower precipitate volume fractions and lower interdiffusion coefficients. The precipitate transformability was found to vary among the four systems examined, with calcia and yttria acting to stabilize tetragonal precipitates to larger sizes; titania was found to act as a destabilizer. This paper reports that coherency stresses are important in determining the precipitate morphology and distribution in these alloys but we were unable to ascertain what effect these stresses had on the coarsening rates of the different alloys.

• OSTI ID: 7238035
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
AGING
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CRYSTAL STRUCTURE
DIFFUSION
KINETICS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE TRANSFORMATIONS
PRECIPITATION
REACTION KINETICS
SEPARATION PROCESSES
STABILITY
STABILIZATION
STRESSES
TIME DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES