Discontinous coarsening of tetragonal precipitates in partially stabilized zirconia induced by diffusional coherency strain under applied stress

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb04272.x· OSTI ID:6270540

Kim, J J; Park, C; Kim, D Y ^[1]; Yoon, D N ^[2]; Shapiro, A ^[3]

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1. Dept. of Inorganic Materials Engineering, College of Engineering, Seoul National Univ., Seoul 151-742 (KR)
2. Dept. of Materials Science and Engineering, Korea Advanced Inst. of Science and Technology, Seoul 136-791 (KR)
3. National Inst. of Standards and Technology, Gaithersburg, MD (United States)

This paper reports partially stabilized zirconia with 6 mol% MgO and 4 mol% CaO aged at 1450{degrees} 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.

• OSTI ID: 6270540
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 73:12; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
GRAIN BOUNDARIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
STABILIZATION
STRAINS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES