Innovations on the aerospace and aircraft industry have been throwing light upon building to future’s engineering architecture at the today’s globalization world where technology is the indispensable part of life. On the basis of aviation sector, the improvements of materials used in aircraft gas turbine engines which constitute 50% of total aircraft weight must protect its actuality continuously. On the other hand utilization of super alloys in aerospace and defense industries can not be ignored because of excellent corrosion and oxidation resistance, high strength and long creep life at elevated temperatures.

Materials that can be used at the homologous temperature of 0.6 Tm and still remain stable to withstand severe mechanical stresses and strains in oxidizing environments are so-called superalloys, usually based on Ni, Fe or Co (Sims et al, 1987). Nickel-based superalloys are the exceptional group of superalloys with superior materials properties. Their excellent properties range from high temperature mechanical strength, toughness to resistance to degradation in oxidizing and corrosive environment. Therefore they are not only used in aerospace and aircraft industry, but also in ship, locomotive, petro-chemistry and nuclear reactor industries.