According to the gradient-enhanced Johnson-Cook model to investigate the evolution of the ASB width (w5%) with the average plastic shear strain for Ti-6Al-4V alloy. Results show that w5% decreases rapidly and then approaches a constant with the increasing of average plastic shear strain. When the total width of the ASB is 0.3235 mm, the critical value of w5% approaches the upper bound (55 μm) measured for Ti-6Al-4V, while when the total width of the ASB is 0.0705 mm, the critical value of w5% approaches the lower bound (12 μm). It is found that the ASB width is influenced by many factors such as material properties, loading rate, ambient temperature, stress and strain states. In the paper, the key assumption of the balance of heat diffusion and plastic work is not adopted and the present analysis is in adiabatic condition