Evolution of dislocation structure during inverse creep of a nickel aluminide: Ni--23. 5Al--0. 5Hf--0. 2B (at. %)

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · J. Mat. Res.; (United States)

OSTI ID:7202605

Schneibel, J H; Horton, J A

A well-annealed polycrystalline nickel aluminide of composition Ni--23.5Al--0.5Hf--0.2B (at. %) shows inverse creep behavior at 1033 K and 250 MPa. The minimum creep rate does not correspond to a steady-state creep condition. The increase in the creep rate with strain and time is accompanied by an increase in the volume fraction of dislocation-containing regions. The inverse transient can be eliminated by prestraining at room temperature. It is absent in the diffusional creep regime.

• Research Organization: Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• OSTI ID: 7202605
• Journal Information: J. Mat. Res.; (United States), Journal Name: J. Mat. Res.; (United States) Vol. 3:4; ISSN JMREE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ALLOYS
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
HAFNIUM ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
NICKEL ALLOYS
POLYCRYSTALS
STRAINS
STRESSES
VERY HIGH PRESSURE
VERY HIGH TEMPERATURE