Abstract
Dislocation/boundary interactions play a prominent role in mechanical properties and plastic deformation of materials. We study the interaction between prismatic screw , prismatic edge and pyramidal mixed dislocations with and twin boundaries in titanium using atomistic simulations. Details of the dislocation reactions depend on the slip system, atomic structure of boundary and stress/strain states. All interactions lead to nucleation of twinning dislocations on both twin boundaries, confirming that the interaction with incoming dislocations is a twin growth mechanism. In addition, dissociation of and dislocations on the results in nucleation of a (tension twin) embryo in the second grain-a new twin nucleation mechanism for twins as a result of and slip.
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