Effects of Zn atoms on the basal dislocation in magnesium solution from Peierls–Nabarro model

Effects of Zn atoms on basal dislocation in Mg solution have been studied by means of the improved 2D Peierls–Nabarro model in combination with misfit approximation under the Fermi–Dirac distribution function of solute atoms. With increasing Zn concentration, the separation distance for edge dislocation is decreased, while the separation distance is increased for screw dislocation. From function of the total dislocation line energy surfaces as shift displacement of dislocation center and separation distance between the partials, it is found that with the increase of solute concentration of Zn atoms, the Peierls energies, Peierls stresses and yield stresses for edge dislocation increase more quickly than ones for screw dislocation, and the increase of edge dislocation is stronger.