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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References
C. M. Wayman and T. W. During, in Engineering Aspects of Shape Memory Alloys, eds. T. W. During, K. N. Melton, D. Stöckel, and C. M. Wayman (Butterworth-Heinemann, London, 1990), p. 3.
O. Mercier and K. N. Melton, Metallurgical Transactions 10A, 387 (1979).
T. Saburi, T. Takagaki, S. Nenno, and K. Koshino, Proceedings of the MRS Internal Meeting on Advanced Materials 9, 147 (1988).
J. L. Proft, K. N. Melton, and T. W. Duerig, Proceedings of the MRS Internal Meeting on Advanced Materials 9, 159 (1988).
H. Miyamato, T. Taniwaki, T. Ohba, K. Otsuka, S. Nishigori, and K. Katc, Scripta Materialia 53, 171 (2005).
T. H. Nam, T. Saburi, and K. Shimizu, Materials Transaction, JIM 31, 959 (1990).
T. H. Nam, T. Saburi, Y. Nakata, and K. Shimizu, Materials Transaction, JIM 31, 1050 (1990).
S. K. Wu, H. C. Lin, and Y. C. Yen, Materials Science and Engineering A 215, 113 (1996).
T. Satow, T. Isano, and T. Honma, Journal of the Japan Institute of Metals 38, 242 (1974).
C. L. Chu, S. K. Wu, and Y. C. Yen, Materials Science and Engineering A 216, 193 (1996).
G. S. Firstov, R. G. Vitchev, H. Kumar, B. Blanpain, and J. Van Humbeeck, Biomaterials 23, 4863 (2002).
C. H. Xu, X. Q. Ma, S. Q. Shi, and C. H. Woo, Materials Science and Engineering A 371, 45 (2004).
ASM Handbook, Alloy Phase Diagrams, Vol. 3 (ASM International, Materials Park, Ohio, USA, 1992), p. 2.
W. M. Latimer, Oxidation Potentials, 2nd edn. (Prentice Hall, New York, 1952).
C. E. Wicks and F. E. Block, Thermodynamic Properties of 65 Elements––Their Oxides, Holides. Carbides and Nitrides (U.S. Govt. Print off, Washington, 1963), p. 33.
S. A. Kekare, D. K. Shelton, and P. B. Aswath, Oxidation of High-Temperature Intermetallics. The Minerals, Metals & Materials Soc. (Warrendale, PA, 1993), p. 325.
F. J. J. van Loo, G. F. Bastin, and A. J. H. Lenen, Journal of Less Common Metals 57, 111 (1978).
J.S. Kirkaldy, and D.J Young, Diffusion in The Condensed State, 137 (1987).
S. K. Wu and C. M. Wayman, Acta Metallurgica 36, 1005 (1988).
H. Funakubo (ed.), Shape Memory Alloys (University of Tokyo, Tokyo, 1984), p. 98.
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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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