Effect of boron on the mechanism of strain transfer across grain boundaries in Ni/sub 3/Al

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · J. Mat. Res.; (United States)

OSTI ID:6419268

Bond, G M; Robertson, I M; Birnbaum, H K

The effect of boron on the mechanism of strain transfer across grain boundaries in Ni/sub 3/Al has been investigated by dynamic recording of events occurring during in-situ straining in the transmission electron microscope. Boundaries in both doped and undoped material can act as effective barriers to dislocation motion, large numbers of dislocations being incorporated into the boundary without any plastic strain occurring in the adjacent grain. In the undoped material, the grain-boundary strain is relieved by the sudden failure of the grain boundary. In the doped material the strain is relieved by the sudden generation and emission of large numbers of dislocations from the grain boundary. This effect may be understood by boron either increasing the grain-boundary cohesion or reducing the stress required to operate grain-boundary dislocation sources, rather than easing the passage of slip dislocations through the grain boundary.

• Research Organization: Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6419268
• Journal Information: J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 2:4; ISSN JMREE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DOPED MATERIALS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
LINE DEFECTS
MATERIALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
STRAINS
TRANSMISSION ELECTRON MICROSCOPY