Research Progress in Cyclic Deformation of Super-Elastic NiTi Shape Memory Alloy

The research progresses in cyclic deformation of super-elastic NiTi alloy in the last two decades were reviewed, with an emphasis on the changes in some important mechanical parameters, the evolution of residual strains, and behaviors of transformation ratcheting. Three typical cyclic constitutive models of super-elastic NiTi alloy constructed based on the macroscopic phenomenological constitutive model, as well as their abilities to describe the cyclically accumulated residual strains and transformation ratcheting of the alloy, were outlined. Suggestions about the future work were presented to overcome the shortcomings in the existing researches, such as those in thermo-mechanical coupled cyclic deformation, non-proportional multiaxial cyclic deformation, and micro-mechanism of cyclic deformation.