日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 5 (1988),
pp. 448-453

Characterization of Shape Memory and Recovery Force in Bending of Ti-Ni Alloys

Yasubumi Furuya1, Heihachi Shimada1, Minoru Matsumoto2 and Toshio Honma2

1Materials Processing, Faculty of Engineering, Tohoku University, Sendai
2Research Institute of Mineral Dressing and Metallurgy (SENKEN), Tohoku University, Sendai

Abstract:

The characterization of the material properties of a shape memory alloy (SMA), i.e., the martensitic transformation temperature, the spontaneous shape recovery and the recovery force by thermoelastic martensite transformation as well as the discussion about the most efficient material processing and application system in engineering devices will be significant for wider use of SMA material in the near future. In this connectin, this paper describes the experimental results obtained by characterizing the physical properties in thermoelastic martensitic transformation, i.e., the change of transformation temperature, etc. in two kinds of Ti-Ni shape memory alloys whose chemical compositions, heat treatments and material processings are different from each other.
Next, the results are shown with the mechanical properties, i.e., the recovery force and spontaneous shape changes investigated by an apparatus made for precisely measuring the recovery force vs temperarure relationship.
Finally, based on the results of bending, a mechanical material-evaluation is attempted for the deformation by the shape memory effect of Ti-Ni alloys.


(Received 1987/6/26)

Keywords:

shape memory alloy, titanium-nickel alloy, shape recovery force, thermoelastic transformation, martensitic transformation


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