Abstract
The oxidation of Ni-11Fe-10Cu alloys in air at high temperature was investigated. A parabolic kinetics was found at 750°C and a linear kinetics was shown at 850 and 950°C. The oxide scale formed at 750°C is compact and coherent possessing triplex oxide layers, i.e., a CuO external layer, a NiFe2O4 middle layer, and a NiO inner layer. A thin copper-rich layer sits between the scale and alloy substrate, functioning as a barrier for iron and nickel diffusing outwards from the alloy substrate and oxygen ion diffusing inwards. The growth mechanism of the multi-layer oxide scale was discussed.
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