Self-diffusion mechanisms on tilt grain boundaries in aluminum are investigated using methods of computer simulation. The authors research grain boundaries of the general type (disorientation angle is 6° and 30°) and of special type (Σ5 (013) и Σ13 (015)). Characteristics of grain boundary self-diffusion D_GB, D₀ and Q are calculated. Self-diffusion characteristics were compared with trajectories of atoms movement. Self-diffusion mechanisms are defined in low-temperature and high-temperature intervals.

Key words: grain boundaries, self-diffusion, computer simulation.