Anisotropy of grain growth in alumina

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

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06452.x· OSTI ID:5155192

Rodel, J; Glaeser, A M ^[1]

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1. Materials and Chemical Sciences Div., Lawrence Berkeley Lab., Berkeley, CA (US)

Grain growth in theoretically dense undoped and MgO-doped polycrystalline Al{sub 2}O{sub 3} was studied, and average grain-boundary migration rates were compared with those of a-plane and c-plane sapphire during migration into the same undoped and MgO-doped materials. The results are discussed in terms of a grain-size-dependent grain-boundary mobility-grain-boundary energy product, M{sub b{gamma}b}. The grain-size dependencies of the M{sub b{gamma}b} products for seed and matrix grains differ. Seed orientation appears to affect the nature of solute-boundary interactions. The importance of grain-boundary structure on migration characteristics is also indicated by a demonstration of twin- formation-enhanced grain growth.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5155192
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 73:11; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANISOTROPY
CHALCOGENIDES
CRYSTAL STRUCTURE
DENSITY
DOPED MATERIALS
GRAIN BOUNDARIES
GRAIN GROWTH
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MICROSTRUCTURE
MIGRATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES