Abstract
The enhancement of cyclic oxidation performance in ultra-high temperature protective coatings for turbine blades in new generation aero-engines can be achieved through the reactive elements or Pt doped β-NiAl single phase. However, it is important to note that the content of Al in NiAl gradually decreases during high temperature service, leading to an inevitable phase transition from β-NiAl to γ’-Ni3Al. We only studied the reactive element effects on the adhension and stability of the α-Al2O3/β-NiAl interface previously, but the influence mechanism for α-Al2O3/γ'-Ni3Al interface is not clear. Therefore, it is imperative to investigate the adhension and stability of the γ’-Ni3Al/oxide interface. This paper investigates the effect of Pt or reactive elements (Hf, Zr, Dy, Y, La) doping on the α-Al2O3/γ'-Ni3Al interfacial adhesion and tensile properties with or without impurity element S, using the first-principles calculation method. The results indicate that the influence of Pt or REs doping on interface adhension is contingent upon the existence of S, and the effect on static interface bonding or dynamic tensile properties varies as well. It will improve the comprehensive design system of Ni-Al coatings, and provide theoretical guidance for the development of new metallic protective coating materials.
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