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Oxidation Behavior of Ti50Ni40Cu10 Shape-Memory Alloy in 700–1,000 °C Air

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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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Acknowledgements

The authors gratefully acknowledge the financial support of this study from the National Science Council (NSC), Taiwan, Republic of China, under the Grant NSC96-2221-E002-016. We also sincerely acknowledge Mr. Shih-Wei Wu for his preliminary experiment of this study.

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Correspondence to Shyi-Kaan Wu.

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Lin, KN., Wu, SK. Oxidation Behavior of Ti50Ni40Cu10 Shape-Memory Alloy in 700–1,000 °C Air. Oxid Met 71, 187–200 (2009). https://doi.org/10.1007/s11085-008-9135-9

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  • DOI: https://doi.org/10.1007/s11085-008-9135-9

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