Hexagonal close-packed and lower symmetry metals often exhibit anisotropic
mechanical properties because the dominant slip system forbids slip in certain lattice directions.
Rod-textured Zircaloy-2 is a model system which can act as a road map for understanding more
complex cases. In this case prism slip is dominant and pyramidal slip is only initiated at higher
applied stresses. Tensile twinning does not always play a role since its initiation depends on the
starting texture. Along the rod axis, Zircaloy-2 exhibits a very strong weighting of poles lying
within the basal plane of the structure such as <10 1 0>, <11 2 0> etc. However, perpendicular to the
rod axis, all