The interaction between screw dislocations and coherent twin boundaries was studied by means of molecular dynamics simulations for Al, Cu and Ni. Depending on the material and the applied strain, a screw dislocation approaching the coherent twin boundary from one side could either propagate into the adjacent twin grain by cutting through the boundary or it could dissociate within the boundary plane. Which one of these two interaction modes applied seems to depend on the material dependent energy barrier for the nucleation of Shockley partial dislocations.

The Interaction Mechanism of Screw Dislocations with Coherent Twin Boundaries in Different Face-Centred Cubic Metals. Z.H.Jin, P.Gumbsch, E.Ma, K.Albe, K.Lu, H.Hahn, H.Gleiter: Scripta Materialia, 2006, 54[6], 1163-8