Simulation Of Tube Drawing Textures In Nickel Titanium Using Visco-Plastic Self Consistent (VPSC) Algorithm

NiTi alloys are used in for biomedical applications such as stents due to their superelastic effect, biocompatibility and favorable mechanical properties. Previous studies have shown that the mechanical properties, especially the fatigue properties are affected by product texture. In the current study, we try to study the origins of tube textures using VPSC simulations. We also experimentally determine the tube textures using X-ray diffraction and EBSD. This is used to validate the model. VPSC is a micromechanical model based on the Eshelby formulation of mechanical response of anisotropic grain embedded in Homogeneous Effective Medium (HEM). This model is used to study plastic deformation behavior and texture evolution of NiTi. The model incorporates slip and twin activity in the B2 austenite and B19’ martensite and the austenite<->martensite phase transformation.