Abstract
The isothermal-oxidation behavior of Ti50Ni40Cu10 shape memory alloy (SMA) in 700–1,000 °C air was investigated by TGA, XRD, SEM and EPMA. Experimental results indicate that a multi-layered oxide scale formed, consisting of an outermost Cu2O(Ni,Ti) layer, a layer of the mixture of TiO2, TiNiO3 and irregular small pores, a layer of the mixture of Ni(Ti,Cu), TiO2 and irregular large pores, a Ti(Ni,Cu)3 layer and an innermost Ti30Ni43–47Cu27–23 layer. The apparent activation energy for the oxidation reaction of Ti50Ni40Cu10 SMA is determined to be 180 kJ/mol, and the oxidation rate follows a parabolic law. A schematic oxidation mechanism of Ti50Ni40Cu10 SMA is proposed to explain the observed results.
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