The boundary structures of {01•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 using atomic-scale computer simulations. The interaction of crystal dislocations with {11•1} and {11•2} twin boundaries was described here, and was compared with results for {01•1} and {10•2} twins. These 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 the crystallographic parameters and other details of the atomic structures of the interfaces. In some cases, 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, 32[3A], 809-12