Role of Σ5, (210), [001] CSL boundary on displacement cascade in bcc Fe

Molecular dynamics simulations were carried out to understand the role of grain boundaries (GB) on radiation damage in bcc Fe bicrystal. The calculations were performed for a Σ5, (210), [001] symmetric tilt grain boundary for different cases where the primary knock-on atom (PKA) is placed at distances of acsl, to 15acsl, from the grain boundary plane. Here, acsl, is lattice parameter of the coincidence site lattice. Present study shows that the influence of GB on the numbers of surviving defects within a grain is confined within a distance, dopt < 9acsl. Our studies also indicate that the grain boundary acts as a reservoir for defects.