Precipitate coarsening by liquid film migration in (Mg,Ca)-PSZ's

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04658.x· OSTI ID:6800936

Dickerson, R M; Laraia, V J; Heuer, A H ^[1]

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1. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering

Precipitate coarsening involving preferential growth of solute-poor tetragonal ZrO[sub 2] precipitates along grain boundaries, combined with migration of grain boundaries containing a liquid silicate phase to form solute-rich precipitate-free cubic ZrO[sub 2], has been observed in grain boundary regions of MgO-CaO-ZrO[sub 2] and CaO-ZrO[sub 2] alloys during isothermal aging at 1,400 C. Studies of alloy with 9.5 mol% total solute, but with varying MgO/CaO ratios, demonstrated a marked composition dependence off the phase separation process, in that such phase separation was rare in MgO-rich materials. The migration process is analyzed using models developed for migration in less complex materials, and a mechanism incorporating orientation-dependent precipitate strain energies is proposed.

• OSTI ID: 6800936
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Journal Issue: 10 Vol. 77:10; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
DATA
EXPERIMENTAL DATA
INFORMATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES