EFFECTS OF ORIENTATION CORRELATIONS ON MISORIENTATION DISTRIBUTIONS IN COLD-DEFORMED ALUMINUM

During plastic deformation, the original grains get subdivided by disl ocation boundaries. The misorientation across the dislocation boundari es varies over a large angular range from low-angle boundaries to typi cal high-angle boundaries. Both the dislocation density and the stored energy in the boundaries relate to the misorientation angle. In the p resent work, effects of orientation correlations on misorientation dis tributions are investigated in aluminium cold rolled to 50 and 90% red uction. Single orientations are selected which well represent the expe rimental textures. These single orientations are randomly mixed (i.e. no orientation correlation) and misorientation distributions are calcu lated. By comparing with experimentally measured misorientation distri butions, it is found that the two types of distributions are significa ntly different in all the investigated cases. These results are used f or a discussion of the significance of orientation correlations on the overall misorientation distributions. (C) 1997 Elsevier Science S.A.