抄録
Ti-6Al-4V, consisting of a and fi phases, is one of the most popular Ti alloys, and the detailed mechanical properties are required in the product design; however, they are not fully understood. In this study, unidirectional tensile tests of α-Ti of Ti-6Al-4V alloys were numerically simulated with a bicrystal plasticity model, and we investigated changes in activities of the basal and prismatic <a> slip systems with changing in the critical resolved shear stress (CRSS) of the basal slip systems. The results showed that higher stress was observed in the crystal grain with c-axis closer to the loading direction, and slip on the basal plane occurred easier than that of prismatic <a> when CRSS of the basal slip systems equals to or slightly higher than that of the prismatic <a> slip systems. The activity of basal slip systems decreased with an increase in their CRSS while that of the prismatic <a> slip systems increased.
