The role of solute segregation in the strength and evolution behaviour of dislocation junctions was studied by using kinetic Monte Carlo and three-dimensional dislocation dynamics simulations. The various solute concentrations, and the characteristics of the junctions, were all included in the simulations in order to conduct a parametric investigation. The results indicated that the solutes had a profound effect upon the strength of the junctions. Solute segregation could lead to both strengthening and weakening behaviours;  depending upon the evolution of the dislocation junctions. The local solute concentration seemed to be the more relevant parameter for characterizing the solute and dislocation interactions, due to the short-range stress field of solutes. Its bounds were set by the unconstrained volume dilatation.

Solute and Dislocation Junction Interactions. Q.Chen, X.Y.Liu, S.B.Biner: Acta Materialia, 2008, 56[13], 2937-47