The boundary structure of {00▪1}, {10▪2}, {11▪1} and {11▪2} twins in hexagonal-close-packed metals and the interaction of crystal dislocations with the first 2 twin types had been studied previously by using atomic-scale computer simulation. The interaction of crystal dislocations with {11▪1} and {11▪2} twin boundaries was described here and compared with the results for {01▪1} and {10▪2} twins. These 4 twins were found to create barriers to the motion of crystal dislocations gliding on the basal plane, and the strength of the barrier depended in a relatively complex manner on crystallographic parameters and details of the atomic structures of the interfaces. In some circumstances, crystal dislocations could be transmitted through the twin boundary, thereby creating twinning dislocations.

Twins as Barriers to Basal Slip in Hexagonal-Close-Packed Metals. A.Serra, D.J.Bacon, R.C.Pond: Metallurgical and Materials Transactions A, 2002, 33[3A], 809-12