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

Q Zu and YF Guo and XZ Tang, ACTA METALLURGICA SINICA-ENGLISH LETTERS, 28, 876-882 (2015).

DOI: 10.1007/s40195-015-0271-3

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.

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