The Effect of Heat Treatment on the Superelastic Behaviour of Nickel-Titanium Shape Memory Alloys

Shape memory alloys (smas) which are the intermetallic materials, exhibit shape memory effect and superelastic behaviour in the macro-structure throught the reversible thermoelastic phase transformation between austenite and martensite phases in the microstructure. nickel-titanium (niti) smas became widespread in several applications, especially in the biomedical field due to their superelastic behavior. in this study, the effect of heat treatment on the sma`s phase transformation temperature is experimentally investigated using the ti-50.8 at.% ni samples. the experimental results which are received from the differential scanning calorimety (dsc) analyses and tensile test are compared. the effect of solutionizing and aging treatments on the superelastic behaviour is investigated.