Grain boundary characterization in Ni/sub 3/Al

Conference · Tue Mar 01 04:00:00 EST 1988

OSTI ID:5030301

Mackenzie, R A.D.; Vaudin, M D; Sass, S L

Grain boundaries in both pure and boron doped Ni/sub 3/Al have been studied using a variety of electron microscopy techniques. Small angle boundary structures were examined in both bicrystal and polycrystalline specimens. Dislocaions with Burgers vector a2<110> are observed in the presence of boron, while dislocations with Burger vector a<100> are observed in the absence of boron. A possible explanation for this behavior is the presence of a disordered layer at the interface in boron-doped Ni/sub 3/Al. The addition of boron to Ni/sub 3/Al was seen to induce faceting of grain boundaries, and to afford the boundaries some protection from etching. Using electron backscatter diffraction patterns, the frequency of occurrence of grain boundary types was found to be unchanged by the addition of boron.

• Research Organization: Cornell Univ., Ithaca, NY (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: FG02-85ER45211
• OSTI ID: 5030301
• Report Number(s): DOE/ER/45211-9; CONF-8804112-1; ON: DE88009169
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BACKSCATTERING
BORON ADDITIONS
BORON ALLOYS
BURGERS VECTOR
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DOPED MATERIALS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
LEPTONS
LINE DEFECTS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
SCATTERING