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The general isothermal oxidation behavior of Cu–8Cr–4Nb

Abstract Oxidation kinetics and oxide morphologies of Cu–8Cr–4Nb (‘GRCop-84’) were investigated by TGA and microscopy/microanalysis, and compared to those of ‘NARloy-Z’ (a Cu–Ag–Zr Cu alloy) between 500 and 900°C. NARloy-Z and Cu had identical oxidation behavior; but Cu–8Cr–4Nb differed strongly, with slower kinetics below ~700°C and a markedly complex oxidation behavior at all temperatures. Explanations are offered for Cu–8Cr–4Nb oxidation behavior, in the various temperature regimes, in terms of oxide types and their morphologies, with emphasis on a kinetic control at intermediate temperatures by a reservoir effect.