INCORPORATION OF BASAL SLIP DISLOCATIONS IN [101BAR2] TWINS IN ZINC CRYSTALS

An electron microscope investigation has been made of the decomposition of ⅓⟨1120⟩ slip dislocations when they penetrate (1012) twin boundaries in zinc. The results show that basal dislocations decompose into an integral number of zonal twinning dislocations and a glissile slip dislocation in the twin. The previously unreported (1100); ⅓⟨1123⟩ slip system is shown to be operative in (1012) deformation twins in zinc and is a direct result of the decomposition of basal dislocations on penetrating twin boundaries. © 1969 Taylor & Francis Group, LLC.