Grain boundary structure in Ni/sub 3/Al. [Boron doped]

Conference · Wed Jul 01 04:00:00 EDT 1987

OSTI ID:5030309

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

The influence of boron segregation and non-stochiometry on grain boundary structure in Ni/sub 3/Al was studied by transmission and scanning electron microscopy techniques. Small angle twist and tilt boundaries were produced by hot pressing misoriented single crystals of both doped and undoped materials. Dislocation structures were observed in both bicrystal and polycrystal grain boundaries. In most cases the grain boundary dislocations were found to have the expected a<100> Burgers vector, however, in one case dislocations with Burgers vector a2<110> dislocations have been observed. Using a SEM diffraction technique the frequency of occurrence of grain boundary types was examined and found to be unchanged by the addition of boron. 12 refs., 4 figs.

• Research Organization: Cornell Univ., Ithaca, NY (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: FG02-85ER45211
• OSTI ID: 5030309
• Report Number(s): DOE/ER/45211-4; CONF-870793-7; MSC-6186; ON: DE88009164
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
BURGERS VECTOR
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
LINE DEFECTS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
SEGREGATION