Post-machining characterization of novel Ni_55.65Ti-SMA via electric discharge machining route

Nickel-titanium-based shape memory alloys (SMAs) belong to an exclusive class of intelligent materials endowed with exceptional characteristics, including superelasticity, wear and corrosion resistance, and shape memory effects, making them well-suited for applications in biomedical, composite structures, aerospace, etc. This research delves into a comprehensive investigation of the post-machining characterization of Ni_55.65Ti-SMA through electric discharge machining (EDM). The post-machining aspects of the Ni_55.65Ti-SMA offered detailed insights into the surface morphology, recast layer thickness, surface hardness, and shape memory effect. It has been investigated that both the RLT and surface hardness are significantly influenced by peak current and pulse time ON and range from 7.09 to 11.85 μm and 84 to 94 HBR, respectively. The composition variations across EDMed Ni_55.65Ti-SMA surfaces, was conducted using EDS and elemental mapping techniques. In addition, XRD was employed to scrutinize the structural alterations resulting from the machining process. DSC analysis encapsulated the post-machining shape-memory effect of Ni_55.65Ti-SMA. This study provides valuable insights into the intricate relationship between the EDM process parameters and the resulting surface microstructures of Ni_55.65Ti-SMA. Comprehensive characterization using advanced techniques enhances the understanding of material transformation during machining.