It was recalled that solute friction prevailed in crystals where a solution of point defects resulted in a diffuse resistance to dislocation motion, and this was often used to strengthen materials. It was shown here that it also affected dislocation-dislocation interactions. Dislocation dynamics simulations were used to investigate and quantify this property. The solute friction resulted in the shielding of elastic interactions, leading to a significant decrease in the intrinsic strengths of junction and annihilation reactions. Simulations of static and dynamic conditions showed that the interaction stability decreased with friction stress. A model was proposed which accounted for a modification of the interaction coefficient predicted by massive simulations in latent hardening conditions. The results suggested that the observed softening was due mainly to a decrease in the line tension of dislocations involved in the dislocation-dislocation interactions.

Solute Friction and Forest Interaction. G.Monnet, B.Devincre: Philosophical Magazine, 2006, 86[11], 1555-65