Dislocation interaction with the local stress field of a 9 tilt grain boundary in body centred cubic tungsten

We report the results of a molecular dynamics study of the interaction between edge dislocations and a ∑9{221}(110) tilt grain boundary in body centred cubic (bcc) tungsten using the Finnis-Sinclair interatomic potential. Our simulations have revealed that the outcome of the dislocation/grain boundary interaction depends sensitively on the precise position of dislocation impact into the grain boundary. As the dislocation approaches the grain boundary, its stress field interacts with the local stress field of the grain boundary which can lead to a rearrangement of atoms within the grain boundary and result in dislocation absorption. At other locations in the boundary such rearrangements do not occur and the dislocation absorption and transmission is presented.