Abstract
NiAlHf coatings were deposited onto Ni-based single crystal (SC) superalloy with different crystal orientations by electron beam physical vapor deposition (EB-PVD). The effects of the crystal orientations of the superalloy substrate on inter-diffusion behavior between the substrate and the NiAlHf coating were investigated. Substrate diffusion zone (SDZ) containing needle-like μ phases and interdiffusion zone (IDZ) mainly consisting of the ellipsoidal and rod-like μ phases were formed in the SC alloy after heat-treatment 10h at 1100°C. The thickness of secondary reaction zone (SRZ) formed in the SC alloy with (011) crystal orientation is about 14μm after 50h heat-treatment at 1100°C, which is relatively thicker than that in the SC alloy with (001) crystal orientation, whereas the IDZ revealed similar thickness.
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