Secondary grain-boundary dislocations in (001) twist boundaries in MgO. II. Extrinsic structures

Technical Report · Tue Dec 01 00:00:00 EST 1981

DOI:https://doi.org/10.2172/5265099· OSTI ID:5265099

Sun, C. P.; Balluffi, R. W.

Extrinsic secondary grain boundary dislocation (GBD) structures were observed by weak beam transmission electron microscopy in a variety of (001) twist boundaries in MgO. These structures were derived from segments of lattice dislocations embedded in the boundaries and could be interpreted as the result of the decomposition of the lattice dislocations into extrinsic GBDs and the subsequent interaction of the product GBDs with the intrinsic boundary structure. The results demonstrate that lattice dislocations in MgO are attracted to grain boundaries over a wide range of conditions and tend to remain embedded in the boundaries as extrinsic GBD structures.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: AS02-78ER05002
• OSTI ID: 5265099
• Report Number(s): DOE/ER/05002-25; ON: DE82011169
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNESIUM OXIDES
DISLOCATIONS
GRAIN BOUNDARIES
TRANSMISSION ELECTRON MICROSCOPY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
LINE DEFECTS
MAGNESIUM COMPOUNDS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies