It was recalled that it was widely known that the solute concentration (via frictional effects) and stacking-fault energy affected the degree of cross-slip and slip planarity in face-centered cubic alloys. The cross-slip was preceded by the constriction of 2 partial dislocations. A model was proposed here for the energy which was required in order to form a constriction, from 2 parallel partial dislocations, as a function of the stacking-fault energy, solute concentration, atomic size misfit and modulus mismatch. Cross-slip was curtailed due to the interaction of solute atoms with the partials. Both the atomic-size misfit and the modulus mismatch affected the local solute concentration which introduced local stresses and determined the energy that was required in order to form the constriction. The shape of the partials, and the energy which was required in order to form the constriction, was established for stacking-fault energies ranging from 10 to 100mJ/m2, misfit strains which ranged from 0.1 to 0.5, modulus-mismatch levels of -1.0 and nominal solute concentrations which ranged from 0 to 10at%. In extreme cases, the constriction energy was found to increase 4-fold; as compared with the solute-free case. The modulus-mismatch effect was important in substitutional alloys with small misfit-strains while, for interstitial-solute cases, misfit-strain effects predominated. The results converged towards the well-known Stroh solution in the limit of zero solute concentration.

Constriction Energy in the Presence of a Solute Field. S.D.Andrews, H.Sehitoglu, I.Karaman: Journal of Applied Physics, 2000, 87[5], 2194-203