The non-continuous multi-cycle nanoindentation along with scratch and wear tests were performed on super elastic (SE) and shape memory (SM) NiTi alloys in order to observe the behaviour of super elasticity and shape memory effect. A spherical indenter with radius 10 μm was used in scratch test under three loads (100, 250 and 500 mN) to evaluate critical limits of scratch resistance and in wear test to evaluate material behavior in repetitive subcritical loads (100 and 250 mN). The study finds that SE shows more elastic recovery after unloading the indenter from the depth profiles. However, in case of SM the recovery is less pronounced with remaining plastic deformation, indicating that stress induced martensite remains in the alloy. Wear test resulted in the pile of the material during multiple ploughing along the track as is observed from track morphology profile. The differences between the materials become smaller when the load in the wear test increases, with even the SE showing marked plastic deformation. • Multicycle nanoindentation test of super elasticity (SE) shows superior recovery in comparison to shape memory (SM) NiTi alloy with its unrecovered depth • Elastic recovery of deformed depth during progressive load scratch and multi-pass wear test of SE sample is higher than for SM, both in small and larger deformations • Wear test in SE and SM shows residual plastic groove with piled up material along the edges.
Vaclavek et al. (Sun,) studied this question.
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