Orientation and temperature dependence of some mechanical properties of the single-crystal nickel-base superalloy Rene N4. I. Tensile behavior
Journal Article
·
· Metall. Trans., A; (United States)
Single crystal specimens of a nickel-base superalloy with axes near 001, 011, and -112 were tested in tension at room temperature, 760, and 980 C. The alloy Rene N-4, was developed for gas turbine engine blades and has the nominal composition 3.7 Al, 4.2 Ti, 4 Ta, 0.5 Nb, 6 W, 1.5 Mo, 9 Cr, 7.5 Co, balance Ni, (all in weight percent). Analysis of slip band traces, specimen axis rotation, and dislocation Burgers vectors showed that at 760 and 980 C primary cube slip supplanted normal octahedral slip for the -112 line-oriented specimens. The other two orientations, which have lower resolved shear stresses on the cube system, exhibited octahedral slip at all three temperatures. The critical resolved shear stress is considerably greater on the cube system than on the octahedral system at room temperature. However, at 760 and 980 C the critical resolved shear stresses on the two systems are about the same. While the room temperature and 980 C yield strengths for the two orientations exhibiting octahedral slip could be rationalized on the basis of resolved shear stress, those at 760 C could not. Such violations of Schmid's law have previously been observed in other superalloys and single phase gamma-prime. 6 references.
- Research Organization:
- NASA, Lewis Research Center, Cleveland, OH; Kansas Univ., Lawrence
- OSTI ID:
- 7225630
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 17A; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
EDGE DISLOCATIONS
ENGINES
GAS TURBINE ENGINES
HARDENING
HEAT ENGINES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERNAL COMBUSTION ENGINES
LATTICE PARAMETERS
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
MONOCRYSTALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
STRAIN HARDENING
TANTALUM ALLOYS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ALLOYS
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DISLOCATIONS
EDGE DISLOCATIONS
ENGINES
GAS TURBINE ENGINES
HARDENING
HEAT ENGINES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERNAL COMBUSTION ENGINES
LATTICE PARAMETERS
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
MONOCRYSTALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
STRAIN HARDENING
TANTALUM ALLOYS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ALLOYS