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Porous TiNi Synthesis from Elemental Powders

Published online by Cambridge University Press:  16 February 2011

Janet C. Hey  and
A. Peter Jardine
Janet C. Hey
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, Stony Brook, NY 11794-2275
A. Peter Jardine
Affiliation:
Dept. of Materials Science & Engineering, SUNY at Stony Brook, Stony Brook, NY 11794-2275
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Abstract

The shape memory alloy TiNi is produced by either Vacuum Induction Melting (VIM) or by Vacuum Arc Remelting (VAR) of pure metal ingots for actuator applications. Powder metallurgy techniques provide an alternative fabrication route for their use in passive damping applications where porosity and deviations in chemical homogeneity can be tolerated. In this study TiNi compacts were cold pressed from the blended elemental powders and sintered in vacuum for varying times at temperatures from 800°C to 1000°C. Two heating rates were used, 5 K/min. and 10 K/min. A TiNi microstructure could be produced after annealing at 1000°C for 6 h., although some TiNi3 was still observed. Sintering above 900°C produced porous microstructures with green densities approaching 3.5 gm/cm3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 483
Copyright
Copyright © Materials Research Society 1995

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References

1.Aksenov, G.I., Drozdov, I.A., Sorokin, A.M., Chernov, D.B and Atyakshev, Y.A., “Phase composition and properties of sintered specimens pressed from a nickel-titanium powder mixture”, Soy. Powd. Metall. Met. Ceram., Vol. 20, pp. 340–343, 1981 10.1007/BF00791666Google Scholar
2.Sekiguchi, Y., Funami, K., Funakubo, H. and Suzuki, Y., “Study on the hot pressed powder metallurgy of a TiNi shape memory alloy”, J. de Phys., C4, Vol 43, pp 279–284, 1982Google Scholar
3.Igharo, M. and Wood, J.V., “Compaction and sintering phenomena in titanium-nickel shape memory alloys”, Powder Metall., Vol 28, No 3, pp 131–139, 1985 10.1179/pom.1985.28.3.131Google Scholar
4.Morris, D.G. and Morris, M.A., “NiTi intermetallic by mixing, milling and interdiffusing elemental components”, Mater. Sci. Eng. A, Vol 110, pp 139–149, 1989 10.1016/0921-5093(89)90165-2Google Scholar
5.Kuroki, H., Nishio, M. and Matsumoto, C., “Expansion and shrinkage of nickel/titanium mixed powder compacts during sintering”, MRS Int'l. Mtg. on Adv. Mats., eds. Doyami, M., Somiya, S. and Chang, R., Vol 9, pp 629–634, MRS, Pittsburgh, 1989Google Scholar
6.Zhang, N., Khosrovabadi, P. Babayan, Lindenhovouius, J.H. and Kolster, B.H., “Assessment of the duration of time required for conventional Ti-Ni sintering”, J. de Phys. IV, C4, Vol 1, pp 163–168, 1991Google Scholar
7.Bastin, G. F. and Rieck, G. D., “Diffusion in the titanium-nickel system: II. Calculations of chemical and intrinsic diffusion coefficients”, Met. Trans., Vol 5, pp 1827–1831, 1974Google Scholar
8.Sims, D.M., Bose, A., German, R.M., “Reactive sintering of nickel aluminide”, Progress in Powder Metallurgy. eds. Freeby, C.L and Hjort, H., Vol 43, pp 575–596, Metal Powder Industries Federation, Princeton, 1987Google Scholar
9.Hey, J.C. and Jardine, A.P., “Shape memory TiNi synthesis from elemental powders”, Mater. Sci. Eng. A,, pp 291–300, 1994 10.1016/0921-5093(94)90384-0Google Scholar