Mechanism of two Way Shape Memory Effect Obtained by Stabilised Stress Induced Martensite

Two Way Shape Memory Effect (TWSME) involves thermomechanical routines which produce some plastic deformation or complex dislocation arrays during the training procedure. The results of TWSME obtained by these thermomechanical training routines are not as good as would be expected because new dislocations are generated during thermal cycling. These dislocations may interact with those that provide TWSME to the alloy. The present authors have developed a completely new training method which involves the stabilisation of the stress induced martensite (SSIM). The present work has been carried out to improve knowledge of the mechanism of TWSME obtained by the SSIM training method. The results show that the new training method not only improves the values of TWSME but also gives improved stability to this TWSME.