Temperature effects on the mobility of pyramidal < c plus a > dislocations in magnesium

HD Fan and QY Wang and XB Tian and JA El-Awady, SCRIPTA MATERIALIA, 127, 68-71 (2017).

DOI: 10.1016/j.scriptamat.2016.09.002

Temperature effects on the mobility of dislocations on pyramidal planes are characterized by molecular dynamics simulations. On the first-order pyramidal planes, near-edge dislocations always decompose, while the critical resolved shear stress (CRSS) for near-screw dislocations increases with increasing temperatures. On the second-order pyramidal planes, the CRSS decreases to a minimum at similar to 400 K, then increases with temperatures. This indicates that first-order pyramidal slip is favorable at low temperatures, while at elevated temperatures both pyramidal slip planes are active, leading to profuse plasticity. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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