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We present a series of experimental observations on surface rumpling of an initially flat NiCoCrAlY coating deposited on a Ni-based superalloy during cyclic oxidation at 1150 °C. The extent of rumpling of the coating depends on the thermal history, coating thickness and exposed atmosphere. While the coating surface progressively roughens with cyclic oxidation, the bulk NiCoCrAlY alloys with the same...
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...
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