Finite Dislocation Elements in Finite Media. II. Trapezoidal Splitting of Partial Dislocations in Thin Foils

Partial dislocations in thin foils split trapezoidally. In numerical calculations the presence of the surface and the elastic anisotropy of the medium is taken into account. In Cu–10 at% Al this tendency for nonparallel orientation of the partials is stronger than in silver. The computation is done on the force level by adjusting the geometry of the arrangement till forces and moments are zero. Deviations from isotropic fitting are considerable. The tendency of screw dislocations to cross slip at surfaces is confirmed.