Over the last 50 years, temperature capability of Ni-based superalloys has been improved as a means to improving thermal efficiencies in aeroengines and power stations. Creep strength is the most important property for gas turbine as the rafted structure is collapsed in the later stage causing unexpected deterioration of strength. Diffusion of elements is important for understanding the high temperature processes including homogenization and precipitation of the phases. Alloys with the Re/Al ratio up to 0.1 shows satisfactory oxidation resistance but that greater than 0.1 exhibits poor...