Abstract
In the present study, multi-axial severe plastic deformation of a nickel-enriched Ti-Ni shape memory alloy for medical applications was performed using the MaxStrain module of the Gleeble system at 350 °C with a high accumulated true strain of e = 6.5. The martensitic transformations and structure were studied using DSC and TEM analysis. The maximum completely recoverable strain was determined by a thermomechanical method. An ultrafine-grained structure with a grain/subgrain size bellow 100 nm was formed in a bulk nickel-enriched Ti-Ni alloy. The resulting structure provides a completely recoverable strain of 10.5%, which is much higher in comparison with the recrystallized structure (4 %).
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