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Bulk γ/γ′ nickel aluminide alloys of composition (in at.%) Ni–20Al with the addition of 0, 5, 10 and 15Pt were fabricated using arc melting, and the microstructure of the alloys was characterized. The oxidation behaviours of the alloys at 1150°C were studied and compared in terms of oxide spallation, oxide microstructure and growth, residual stress in the α-Al2O3 scale and oxide/alloy interface morphology...
The residual stresses in a Pt-diffused γ/γ′ bond coat after oxidation were investigated using the curvature and X-ray sin 2 ψ techniques. Contrary to the β-(Ni,Pt)Al, the Pt-diffused γ/ γ′ bond coat was in compression at room temperature due to a lower coefficient of thermal expansion. The stresses measured by the curvature method mainly came from the thermal misfit between the bond coat and...
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