Precipitate coarsening by liquid film migration in (Mg,Ca)-PSZ's
Creators
- 1. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
Description
Precipitate coarsening involving preferential growth of solute-poor tetragonal ZrO2 precipitates along grain boundaries, combined with migration of grain boundaries containing a liquid silicate phase to form solute-rich precipitate-free cubic ZrO2, has been observed in grain boundary regions of MgO-CaO-ZrO2 and CaO-ZrO2 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
Additional details
Publishing Information
- Journal Title
- Journal of the American Ceramic Society
- Journal Volume
- 77
- Journal Issue
- 10
- Journal Page Range
- p. 2657-2662.
- ISSN
- 0002-7820
- CODEN
- JACTAW
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 26032552
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- CALCIUM OXIDES; CHEMICAL COMPOSITION; EXPERIMENTAL DATA; MAGNESIUM OXIDES; MICROSTRUCTURE; ZIRCONIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; DATA; INFORMATION; MAGNESIUM COMPOUNDS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS