Influences of MCrAlY coatings on oxidation resistance of single crystal superalloy DD98M and their inter-diffusion behaviors

The TEM micrograph of the IDZ and SRZ of the NiCoCrAlYHfSi-coated specimen oxidized at 1050 °C for 100 h and the respective diffraction patterns of the needle-like and the granular TCP phase precipitated in the SRZ. The SAD results of both types of precipitates in the SRZ for the coated specimen were well in agreement with that of the mu symbol-TCP phase, indicating both the needle-like TCP and the granular TCP were mu symbol-TCP.