Ni or Co based superalloys were developed during 1950-1970. The Ni-based
superalloys are usually used in fabrication of turbine blades and hot sections of gas
turbines. Depending on the type of turbine, the temperature of external gases from
the combustor can range between 800-1200°C. Under these conditions, superalloy
would be reacted by high temperature oxidation and corrosion at elevated
temperatures