日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 628-633

Martensitic Transformation Behavior and Shape Memory Properties of Ti-Ni-Pt Melt Spun Ribbon

Tomonari Inamura1, Yohei Takahashi1,, Hideki Hosoda1, Kenji Wakashima1, Takeshi Nagase2, Takayoshi Nakano2, Yukichi Umakoshi2 and Shuichi Miyazaki3

1Precision and Intelligence Laboratory, Tokyo Institute of Technology, Tokyo 226-8503
2Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita 565-0871
3Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573

Abstract:

Martensitic transformation behavior and shape memory properties of Ti50Ni40Pt10 (TiNiPt) melt-spun ribbons fabricated by a single roll melt-spinning technique were characterized. The constituent phases of the as-spun ribbon were B2 (parent phase) and B19 (martensite phase) at room temperature. The B2-B19 martensitic transformation temperatures of the as-spun ribbon were 100 K higher than those of the bulk-material with the same chemical composition. The martensitic transformation temperatures of the as-spun ribbon were decreased with increasing the temperature of the heat-treatment made after the melt-spinning. As-spun ribbon and the heat-treated ribbons exhibited shape recovery by heating and/or pseudoelasticity. The martensitic transformation temperatures determined from the temperature dependence of the 0.2% flow stress of the pseudoelastic deformation were in good agreement with those of B2-B19 martensitic transformation determined by DSC. It was confirmed that the observed shape recovery and pseudoelasticity are shape memory effect and superelasticity, respectively, due to the B2-B19 martensitic transformation.


(Received 2005/5/12)

Keywords:

high temperature shape memory alloy, rapid solidification, melt spinning, superelasticity, shape memory effect


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