Effects of strain aging on two-way shape memory effect in a nickel–titanium alloy for medical application

The two-way shape memory effect (TWSME) manifestation in Ti–50.7 at.% Ni alloy after various regimes of thermomechanical treatment including strain aging was studied. The influence of the training parameters – the load time and the load value – on the TWSME evolution was also examined. These parameters are also effective for regulation of the reverse transformation range and residual (unrecoverable) strain. The well-developed polygonized substructure with fine-scale precipitates is favourable for achieving the best combination of TWSME parameters. The results of the investigation are realized in videoendosurgical practice for creating a unique device for laparoscopic extravascular occlusion. Application of the new device simplifies the surgical procedure and decreases the possibility of patient trauma in the process of laparoscopic surgical intervention.