Effect of nanocrystallisation on oxide composition of Ni-20Cr alloy at 1000°C

Abstract

A Ni-20Cr nanocrystalline coating was obtained by means of magnetron sputtering. The oxide composition of the Ni-20Cr alloy and its nanocrystalline coating after treatment in air at 1000°C was analysed. The results indicated that the oxide scale formed on Ni-20Cr alloy is composed of two layers. The external layer consists of NiO containing some Cr₂O₃ particles and the internal layer is continuous Cr₂O₃ with a little NiCr₂O₄, whereas the scale formed on the sputtered Ni-20Cr nanocrystalline coating consists mainly of Cr₂O₃ with a little NiCr₂O₄. The mechanism for the effect of nanocrystallisation on the oxidation of the Ni-20Cr alloy is discussed.

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