Abstract
A theoretical study of the coherent boundary migration of extension twin in magnesium is performed focusing on twinning transformations of host lattices and homogeneous nucleation of twinning dislocations. The twinning transformation of host lattice has a small activation volume which usually characterizes a civilian/diffusive mechanism. The critical width of a twinning dislocation dipole is less than fifteen nanometers. The corresponding per-atom energy to activate a dipole is lower than the thermal energy kBT at room temperature. A highly adaptive migration behavior of coherent twin boundary is expected and in accordance with previous experiment observations.
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