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

Abstract

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 \( \{ 10\bar{1}1\} \) plane and its adjacent planes \( \{ 30\bar{3}4\} \) and \( \{ 30\bar{3}2\} \) are presented using Liu embedded-atom-method potential method, and one possible dissociation path of \( 1/3\langle {11\bar{2}3} \rangle \) dislocation on \( \{ 10\bar{1}1\} \) plane with minimum energy is predicted. Meanwhile, another two reasonable dissociation paths of \( 1/3\langle {11\bar{2}3} \rangle \) dislocation successively on \( \{ 30\bar{3}4\} \) and \( \{ 30\bar{3}2\} \) 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.