Abstract
The effect of two base alloys, viz. Ni-based superalloy Rene 80 and Co-based alloy ECY768, on the oxidation and interdiffusion behavior of a NiCoCrAlY Re-containing coating after exposure for up to 2000 h at 1050°C in synthetic air has been evaluated. Scanning electron microscopy with energy-dispersive x-ray spectroscopy was employed to measure the element concentrations, and phases were identified by electron backscatter diffraction. Significant depletion of β-NiAl within the coating, enrichment of γ′-phase, and formation of µ-phase in the alloy and Kirkendall porosity at the coating–alloy interface were observed in the coating on Rene 80. In contrast, the coating on the Co-base alloy ECY768 formed large amounts of Cr/Re-rich carbides and the depletion of β-NiAl phase was less pronounced than that observed on the Ni-base alloy. These findings could be interpreted using an in-house-developed thermodynamic–kinetic CALPHAD-based computer model.
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