Effects of chemical inhomogeneities on grain growth and microstructure in Al sub 2 O sub 3

As local Si and Ca concentrations increase, the grain boundary-grain boundary dihedral angle distribution widens, grain-size distribution widens, and pore-boundary separation is enhanced. Discontinuous grain growth occurs in regions of undoped Al sub 2 O sub 3 containing the largest Ca and Si concen...

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Veröffentlicht in:	Journal of the American Ceramic Society 1989-01, Vol.72 (1), p.130-136
Hauptverfasser:	Handwerker, Carol A, Morris, Patricia A, Coble, Robert L
Format:	Artikel
Sprache:	eng
Schlagworte:	360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies 400201 - Chemical & Physicochemical Properties ALKALINE EARTH METAL COMPOUNDS ALUMINIUM COMPOUNDS ALUMINIUM OXIDES CHALCOGENIDES CRYSTAL STRUCTURE CRYSTALS ELECTRON MICROSCOPY FABRICATION GRAIN ORIENTATION IMPURITIES INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY MAGNESIUM COMPOUNDS MAGNESIUM OXIDES MATERIALS SCIENCE MICROSCOPY MICROSTRUCTURE MONOCRYSTALS ORIENTATION OXIDES OXYGEN COMPOUNDS POWDERS SCANNING ELECTRON MICROSCOPY SINTERING
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Beschreibung
Zusammenfassung:	As local Si and Ca concentrations increase, the grain boundary-grain boundary dihedral angle distribution widens, grain-size distribution widens, and pore-boundary separation is enhanced. Discontinuous grain growth occurs in regions of undoped Al sub 2 O sub 3 containing the largest Ca and Si concentrations. Doping with MgO solute reduces impurity effects on grain growth by increasing bulk solubility, decreasing interfacial segregation of impurities, and narrowing the distribution of grain boundary-grain boundary dihedral angles. 38 refs.
ISSN:	0002-7820 1551-2916
DOI:	10.1111/j.1151-2916.1989.tb05965.x