Research on biaxial tensile deformation behavior of CP-Ti by experiments and crystal plasticity simulations

This study investigates the biaxial tensile deformation behavior of commercially pure titanium (CP-Ti) under different load ratios and deformation temperatures. EBSD analysis and crystal plasticity simulation methods are employed to comprehensively elucidate the plastic deformation mechanisms under various loading conditions. The results indicate that as the load biaxiality increases, the activity of prismatic slip gradually decreases, while the activities of basal slip and twin systems increases gradually, leading to an increase in material strength. The biaxial strengthening effect is most significant under equi-biaxial loading conditions. An increase of load along the rolling direction (RD) favors the activation of prismatic slip system and extension twins, while an increase of load along the transverse direction (TD) favors the activation of basal slip system. With increasing temperature, twinning activity decreases and dislocation slip activity increases. Under equi-biaxial loading at different temperatures, prismatic slip remains the dominant slip mode. With rising temperature, basal slip activity increases, and pyramidal slip activity intensifies significantly.