Miroscale deformation in a two-phase Ti-alloy studied using strain mapping techniques

The purpose of this study is to investigate the deformation at the micostructural scale in a two-phase titanium alloy. Detailed in situ deformation studies have been carried out on lamellar and bi-lamellar microstructures of Ti-6246. Digital Image Correlation was used to obtain the strain maps from optical images taken during loading where high localised strain was mainly observed close to grain boundary α and in α orientations favourably orientated for slip. It was found on further loading that high strain areas also coincided with slip traces. Several of these slip traces transferred across grain boundary a regardless of the difference in neighbouring orientations. For further clarification CPFEM was used to predict the deformation by creating a virtual microstructure from the EBSD data. Predicted strain maps were then compared to those measured using DIC. Furthermore, studies of the a₁ ,a₂ and a₃ slip will be carried out using EBSD and TEM to clarify why slip occurs in some regions of favourable orientations more than others.