Core structures and mobility of < c > dislocations in magnesium
HD Fan and J Tang and XF Tian and QY Wang and XB Tian and JA El-Awady, SCRIPTA MATERIALIA, 135, 37-40 (2017).
The core structures and mobility of < c > dislocations in magnesium were predicted using both density functional theory and molecular dynamics simulations. The pure edge and screw cores are compact at 0 K. With increasing temperature up to 700 K, the edge dislocation dissociates into two < c >/2 partials on the basal plane, but remains immobile. The screw dislocation remains compact and continuously cross-slips between the three prismatic planes. At room temperature, the screw dislocation only glides after emitting a vacancy at 420 MPa. The Peierls stress of the dislocation after vacancy emission is 50 MPa. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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