Analysis on Dissociation of Pyramidal I Dislocation in Magnesium by Generalized-Stacking-Fault Energy

The generalized-stacking-fault energies are calculated to illustrate the dissociation of 〈c + a〉 dislocation on pyramidal I plane in magnesium. The γ surfaces of plane and its adjacent planes and are presented using Liu embedded-atom-method potential method, and one possible dissociation path of dislocation on plane with minimum energy is predicted. Meanwhile, another two reasonable dissociation paths of dislocation successively on and planes are also proposed. Moreover, based on molecular dynamics simulations of magnesium single crystals under c-axis compression, the possible slip path is further examined and discussed.