The effects of composition and {gamma}{prime}/{gamma} lattice parameter mismatch on the critical resolved shear stresses for octahedral and cube slip in NiAlCrX alloys
- NASA-Lewis Research Center, Cleveland, OH (United States). Advanced Alloys Branch
Prototypical single-crystal NiAlCrX superalloys were studied to examine the effects of the common major alloying elements, Co, Mo, Nb, Ta, Ti, and W, on yielding behavior. The alloys contained about 10 at. pct Cr, 60 vol pct of the {gamma}{prime} phase, and about 3 at. pct of X in the {gamma}{prime}. The critical resolves shear stresses (CRSSs) for octahedral and primary cube slip were measured at 760 C, which is about the peak strength temperature. The CRSS{sub oct} and CRSS{sub cube} are discussed in relation to those of Ni{sub 3} (Al, X) {gamma}{prime} alloys taken from the literature and the {gamma}{prime}/{gamma} lattice mismatch. The CRSS{sub oct} of the {gamma} + {gamma}{prime} alloys reflected the compositional dependence of the {gamma}{prime}/{gamma} mismatch, but bore no similarity to that of CRSS{sub cube} for {gamma}{prime} alloys since it is controlled by the {gamma} matrix. The ratio of CRSS{sub cube}/CRSS{sub oct} was decreased by all alloying elements except Co, which increased the ratio. The decrease in CRSS{sub cube}/CRSS{sub oct} was related to the degree in which elements partition to the {gamma}{prime} rather than the {gamma} phase.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 484850
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 28, Issue 4; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the nature of lattice distortion near the {gamma}/{gamma}{prime} interfaces in nickel-base superalloys
Effect of the Al and Mo on the {gamma}{prime}/{gamma} lattice mismatch and {gamma}{prime} morphology in Ni-based superalloys