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 atNi 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.
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