It was noted that the overall stress state in the γ-channels of γ/γ' microstructures had 3 components. These were misfit stresses that were due to γ/γ' misfit, dislocation stress fields and the external stress. Glide and climb forces on γ-channel dislocations from the a/2[01¯1](111) slip system were studied by calculating Peach-Köhler forces for γ/γ' interface dislocations which were exposed to the overall stress state. A thermo-elastic finite-element calculation of misfit stresses was carried out, and the results were used as input to a simplified discrete dislocation model. The effect of the γ'-volume fraction and the dislocation density in the γ-channels was explicitly considered. The results helped to explain the build-up of back stresses and to rationalize dislocation network spacings.

Interface Dislocations in Superalloy Single Crystals. M.Probst-Hein, A.Dlouhy, G.Eggeler: Acta Materialia, 1999, 47[8], 2497-510