It was recalled that the phase field method was an attractive alternative means for studying dislocations of arbitrary configuration. It had been generalized to the treatment of dislocation nodal reactions and network formation and, within this framework, a study was made here of the dissociation of various dislocation configurations into Shockley partials. This was done by directly incorporating γ-surface data, deduced from ab initio calculations, into the crystalline energy of the phase field model. The model was first checked against the generalized P-N model, for the dissociation of straight edge and screw dislocations in Al and Pd, by using the same sets of γ-surface data and elastic constants. The dissociation of dislocation nodes, and a bent dislocation gliding on 2 intersecting {111} planes, were then investigated. The former led to an extended or contracted node; depending upon the sense of the vectors of the unit dislocations that joined the node. The latter led to a stair-rod dislocation at the intersection of the 2 planes.

Incorporation of γ-Surface to Phase Field Model of Dislocations - Simulating Dislocation Dissociation in FCC Crystals. C.Shen, Y.Wang: Acta Materialia, 2004, 52[3], 683-91