The effect of elastic anisotropy on the direction and faceting of chemically induced grain boundary migration in Al[sub 2]O[sub 3]

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90330-U· OSTI ID:6470021

Lee, Ho Yong; Kang, Suk Joong L ^[1]; Yoon, Duk Yong ^[2]

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1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Ceramic Science and Engineering
2. Korea Advanced Inst. of Science and Tech., Taejon (Korea, Republic of). Dept. of Material Science and Engineering

The coherency strain energy of a Fe[sub 2]O[sub 3] diffusion zone is calculated to be maximum at the (0001) surface of Al[sub 2]O[sub 3] grain. An Al[sub 2]O[sub 3] single crystal has been diffusion bonded at its (0001) surface of Al[sub 2]O[sub 3] piece to form (0001) grain boundaries. When this specimen is heat-treated at 1,600C in the presence of Fe[sub 2]O[sub 3], all of the (0001) grain boundaries migrate to the direction of the single crystal, producing behind them zones enriched with Fe[sub 2]O[sub 3]. The migrating (0001) boundaries show faceting due to the appearance of boundary segments with different orientations moving more slowly than the initial (0001) segment. These results are consistent with the coherency strain theory for the initiation and continuation of the migration.

• OSTI ID: 6470021
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:8; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
GRAIN BOUNDARIES
DIFFUSION
EXPERIMENTAL DATA
HEAT TREATMENTS
IRON OXIDES
MONOCRYSTALS
POLYCRYSTALS
STRAINS
SURFACES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTALS
DATA
INFORMATION
IRON COMPOUNDS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies