Microstructural evolution of CoCrAlY bond coat on Ni-based superalloy DZ 125 at 1050 °C

► Interdiffusion between CoCrAlY bond coat and Ni-based superalloy was investigated. ► Microstructure evolution of CoCrAlY bond coat at high-temperature investigated. ► The mechanism for the phase evolution of the bond coat was discussed. ► The mass fraction of the β and γ phases in the bond coat was calculated.