Dislocation dynamics in Ni{sub 3}Al: Experiments and computations

Conference · Thu Jul 01 00:00:00 EDT 1999

OSTI ID:20001683

Bhate, N; Kumar, S; Phillips, R; Clifton, R J

A modified electrolytic etchant has been successfully used to observe dislocation etch-pits on {l{underscore}brace}100{r{underscore}brace} surfaces of single crystal Ni{sub 3}Al containing Hf and B additions. Four-point bending tests have been used to obtain the dependence of dislocation velocity on resolved shear stress at room temperature. A comparison with earlier studies reveal that the rate of change of dislocation velocity with resolved shear stress, to a first approximation, is independent of alloying. Atomic level simulations have been performed using the embedded atom method (EAM) to study dislocation core structures and frictional stress in Ni{sub 3}Al.

• Research Organization: Brown Univ., Providence, RI (US)
• Sponsoring Organization: National Science Foundation (NSF)
• OSTI ID: 20001683
• Report Number(s): CONF-981104-; ISBN 1-55899-458-0; ISSN 1067-9995; TRN: IM0001%%120
• Resource Relation: Conference: High-Temperature Ordered Intermetallic Alloys VIII, Materials Research Society Symposium Proceedings, Boston, MA (US), 11/30/1998--12/03/1998; Other Information: PBD: 1999; Related Information: In: High-temperature ordered intermetallic alloys VIII. Materials Research Society symposium proceedings: Volume 552, by George, E.P.; Mills, M.J.; Yamaguchi, Masaharu [eds.], [600] pages.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
NICKEL ALLOYS
ALUMINIUM ALLOYS
HAFNIUM ADDITIONS
BORON ADDITIONS
INTERMETALLIC COMPOUNDS
MONOCRYSTALS
DISLOCATIONS
KINETICS
SIMULATION
EXPERIMENTAL DATA