日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 575-580

Effect of Cold Working on Transformation and Deformation Behavior after Pre-Deforming in Ti-50 at%Ni Shape Memory Alloy

Toshio Sakuma1,, Yuji Mihara2,, Hirotada Toyama2,, Yasuo Ochi2 and Kiyosi Yamauchi3

1Central Research Institute of Electric Power Industry, Komae 201-8511
2University of Electro-Communications, Chofu 182-8585
3Tohoku University, Biomedical Engineering Research Organization, Sendai 980-8575

Abstract:

It is reported that the transformation characteristics of Ti-Ni shape memory alloys are influenced by manufacturing conditions, such as composition, heat-treatment temperature, cold working, and so on. To understand correctly the effects of these manufacturing conditions on transformation characteristics of Ti-Ni shape memory alloys make it possible to control the transformation temperature and recovery stress. The purpose of this work is to clarify the effect of cold working ratio on transformation and deformation behavior after pre-deforming shape memory alloy. The specimens were Ti-50 at%Ni annealed at 673 K for 3.6 ks. The variation of the recoverable strain, recovery stress and transformation temperature with cold working ratio was investigated experimentally. The solution treated material was also used as a reference material. The effect of cold working ratio on the transformation and deformation behavior will be discussed in relation to the residual martensite volume fraction subjected to slip deformation.


(Received 2005/2/24)

Keywords:

shape memory alloy, Ti-50 at%Ni, cold working, pre-deformation, transformation and deformation behavior


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