The interaction of matrix screw dislocations with twin boundaries was computer-simulated for various hexagonal close-packed models which represented -Ti and Mg. The atomic structure of the screw core in these 2 models was suitable for crystals that underwent slip mainly upon the prism and basal planes. The movement, under 3 different components of applied strain, of a 1/3<11•0> matrix screw dislocation (in both its prism and basal forms) into the boundary of the {10•2} and {10•1} twins was described for a geometry in which the screw dislocation was parallel to the interface. The screw dislocation crossed the {10•2} boundary by cross-slip onto either of the 2 slip systems, but the {10•1} boundary usually absorbed the screw dislocation via a process of decomposition into 2 twinning dislocations. This behavior, and the glide resistance, were explained in terms of the interfacial structure of the twins and the properties of the twinning dislocations.

A.Serra, D.J.Bacon: Acta Metallurgica et Materialia, 1995, 43[12], 4465-81