Cyclic deformation of Ni/sub 3/(Al,Nb) single crystals at ambient and elevated temperatures

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(87)90084-8· OSTI ID:5524537

Bonda, N R; Pope, D P; Laird, C

In order to study cyclic deformation and asymmetry in the flow stress of the ..gamma..' phase, Ni/sub 3/(Al,Nb) crystals have been cycled in strain control at room temperature, 400 and 700/sup 0/C. The orientation of the crystals has been a major variable studied. At all temperatures, cyclic hardening is considerable. At the two lower temperatures, asymmetry follows the predictions of the model by Paidar et al. which is based on the increase of the dislocation friction stress by thermally activated cross slip onto (001) planes. TEM observations of the dislocation structures are consistent with the model. At 700/sup 0/C, a dominance of tensile stress in the asymmetry was observed. The model does not apply at this high temperature. Cracking and life behavior are also reported.

• Research Organization: Dept. of Metallurgical Engineering, Ohio State Univ., Columbus, OH 43210
• OSTI ID: 5524537
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 35:9; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DISLOCATIONS
ELECTRON MICROSCOPY
HARDENING
HIGH TEMPERATURE
LINE DEFECTS
MATHEMATICAL MODELS
MICROSCOPY
MONOCRYSTALS
NICKEL ALLOYS
NIOBIUM ALLOYS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
TRANSMISSION ELECTRON MICROSCOPY