摘要

The generalized-stacking-fault energies are calculated to illustrate the dissociation of < c + a > dislocation on pyramidal I plane in magnesium. The gamma surfaces of {10 (1) over bar1} plane and its adjacent planes {30 (3) over bar4} and {30 (3) over bar2} are presented using Liu embedded-atom-method potential method, and one possible dissociation path of 1/3 < 11 (2) over bar3 > dislocation on {10 (1) over bar1} plane with minimum energy is predicted. Meanwhile, another two reasonable dissociation paths of 1/3 < 11 (2) over bar3 > dislocation successively on {30 (3) over bar4} and {30 (3) over bar2} 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.