Evolution of texture in aggregates of crystals exhibiting both slip and twinning

A methodology is presented for computing the deformation texture of polycry stalline metals that exhibit both crystallographic slip and mechanical twin ning. Texturing is calculated by integrating a conservation equation for th e orientation distribution function cast over an angle-axis parametrization of orientations. Textures presented with and without twinning are computed for plane strain compression for both face-centred cubic and hexagonal clo se-packed materials. A new criterion for the termination of twinning is int roduced which is based on the probability of different twin lamellae coexis ting in the same single crystal without intersecting. Texture predictions, together with the computed volume fractions of twins, are compared to exper imental data reported in the literature.