Modeling degradation and failure of Ni-Cr-Al overlay coatings

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Department of Materials Science and Engineering


Degradation of an Ni-16at.%Cr-25at.%Al-0.06at.%Zr overlay coating on an Ni-22at.%Cr substrate was examined after oxidation accompanied by thermal cycling. Concentration-distance profiles were measured in the coating and substrate after various numbers of 1 h cycles at 1150°C. A numerical model was developed to simulate coating degradation by simultaneously oxidation and coating- substrate interdiffusion. The validity of the model was confirmed by comparison of predicted and measured concentration-distance profiles. The ability of the model to identify critical system parameters was demonstrated for the case of the initial aluminum and chromium content of the coating and substrate.

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Thin Solid Films