Superelastic NiTi shape memory alloy in-situ thermomechanical simulation by Gleeble® synchrotron system

NiTi alloys have attractive functional properties as shape memory effect and the superelasticity appropriated to be used in different segments in engineering and biomedical areas, in addition to exhibit excellent corrosion resistance and biocompatibility. These functional properties are obtained through the thermomechanical process. Thermomechanical processes aim to obtain the appropriate shape of the material, to control phase transformation temperatures, to improve the alloy characteristics, and refine shape memory effect or superelasticity. To obtain the desired microstructure the hot work should be performed to assure the mechanical and functional properties adequate. In this study the physical simulation as to the evaluation of the structural modifications in the remelted and annealed alloy was performed at Gleeble® at two different deformation rates (of the order of 10^-1 and 10^-2 s^-1) at 850°C. (author)