Abstract
The oxidation behavior of Ni-rich NiTi(-Hf) alloy at the temperature range from 400 to 950 °C is investigated in this paper. For Ni-rich NiTi alloy, the results show that the oxidation kinetics follow the logarithmic law at 400 °C and obey the parabolic law from 500 to 950 °C. After high-temperature oxidation, the observed multi-layered scale structure consists of TiO2+Ti2O3+NiTiO3, Ni(Ti)+Ti2O3+rich Ti, and Ni3Ti from outside to the inside. The addition of the Hf element improves the high-temperature oxidation resistance. A schematic oxidation mechanism of Ni-rich NiTi(-Hf) alloy is proposed to explain the observed results.
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