Understanding the Deformation Micro-mechanism in Ti–6Al–4V Alloy U-Notched Specimen

High strength-to-low weight ratio, corrosion resistance, and excellent mechanical properties make the Ti–6Al–4V alloy a favorable material for aerospace application. In this study, digital image correlation (DIC) techniques together with the electron back scatter diffraction (EBSD) were employed to understand the deformation micro-mechanism. A uniaxial tensile test was carried out on the notched flat specimen, which failed at 3200 N. A further interrupted tensile test was performed, for the load applied up to 2000, 2500, and 3000 N. The microstructure analysis using EBSD was performed just beneath the notch region to understand the deformation micro-mechanism. Plastic deformation evident was significant at the lower load itself. Moreover, a significant variation in the local texture has been observed at the notch tip, where the plastic deformation is very high.