Driving strain heterogeneity in NiTi components

The experiment is dedicated to the spatial mapping of phase transformation in superelastic NiTi shape memory alloy (SMA) polycrystalline wires under general loading conditions during temperature-induced martensitic transformation coupled with large plastic deformation. It proposes to employ recently developed diffraction/scattering computed tomography (DSCT) adapted by authors for experiments on NiTi SMA, which was found to provide unique data of evolving martensitic transformation in complex NiTi structures, where other experimental techniques (e.g. CT, DIC) fail. The main aim of this experiment is to extend knowledge of a newly observed TRIP mechanism in this important SMA material to general loading case, which can significantly contribute to development of advanced modeling tools for SMA applications.