On the Effect of Alloying Additions to the Ni-Cr-Al-Nb Dual-Superlattice Gamma-Gamma Prime-Gamma Double Prime Superalloys

摘要

Recent work has identified a novel Ni-Cr-Al-Nb alloy capable of generating a γ-γ'-γ" dual-superlattice microstructure with excellent microstructural stability and tensile strength. In this study, we report on the effect of additions of alloying elements that traditionally partition to the γ matrix. Attention is focussed on their effects upon the microstructure, hardness and lattice misfit of dual-superlattice superalloys. The results obtained from these studies indicate that judicious alloying may further enhance the properties and stability of these dual-superlattice superalloys and that they offer the potential of greatly increased temperature capability compared to other alloys reinforced by y" precipitates.