Effects of chemical inhomogeneities on grain growth and microstructure in Al/sub 2/O/sub 3/
- Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Materials Science and Engineering
The authors discuss the effects of chemical inhomogeneities and single-crystal seeds on normal and discontinuous grain growth investigated in both undoped and MgO-doped Al/sub 2/O/sub 3/. The chemical impurities in the samples were exsolved at a lower temperature than the sintering temperature and measured by SEM/EDS to determine the correlation between the distribution of impurities and the microstructure in Al/sub 2/O/sub 3/. Discontinuous grain growth was observed in regions of undoped Al/sub 2/O/sub 43/ containing the largest Ca and Si concentrations. It is suggested that doping with MgO solute reduces the effects of impurities on grain growth by increasing the bulk solubility and decreasing interfacial segregation of impurities, especially Si, and by narrowing the distribution of grain boundary-grain boundary dihedral angles.
- OSTI ID:
- 5178683
- Journal Information:
- Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:1; ISSN 0002-7820; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON MICROSCOPY
FABRICATION
GRAIN ORIENTATION
IMPURITIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
MICROSTRUCTURE
MONOCRYSTALS
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
POWDERS
SCANNING ELECTRON MICROSCOPY
SINTERING