Oxidation of Metals

, Volume 71, Issue 3–4, pp 187–200 | Cite as

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

Original Paper


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.


TiNiCu shape memory alloy Oxidation mechanism Oxidation kinetics 



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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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringNational Taiwan UniversityTaipeiTaiwan

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