The glide of a dissociated dislocation across a shearable coherent face-centered cubic particle, embedded in a face-centered cubic matrix, was computer-simulated. The particle and matrix had different stacking-fault energies, and the flexibility of both partial dislocations was allowed for. An Al-rich Al-Ag alloy was used as a model system. Numerical values were obtained for the maximum interaction force between the dislocation and the particle. This force was compared with an analytical function which had been derived on the basis of the straight-line approximation. The former was smaller than the latter. After suitable adjustment, the analytical values could be used to represent the simulated data. Insertion of the analytical values into Friedel's relationship, for the critical resolved shear stress, then yielded an analytical description of stacking-fault energy mismatch strengthening.

Stacking-Fault Energy Mismatch Strengthening Revisited E.Nembach, T.Pretorius, D.Rönnpagel: Philosophical Magazine A, 1998, 78[4], 949-63