Abstract
In this study, the activation energy of dislocation motion in Mg at finite temperature is evaluated using the combination of nudged elastic band method and constraint molecular dynamics method. In tha case of edge dislocation, while the energy barrier at 0 K for prismatic slip is found to be twice larger than that for basal slip, their energy level is significantly small. On the other hand, energy barrier for screw dislocation glide on prismatic plane is quite large, and the obtained result suggests that the process of recombination and redissociation of partial dislocations is a key factor to understand the temperate dependence of activation energy for dislocation motion.
