Results on X-ray line-broadening in material which had been cold-worked to large strains were compared with published transmission electron microscopy results. The X-ray data suggested that a new type of cell-wall structure evolved; with the onset of stage-IV being in good agreement with an increase in misorientation between shrinking cell-blocks. The increasing misorientation was attributed to the evolution of polarized tilt walls, at the cost of the polarized dipolar walls which predominated in stages II and III of deformation. On the basis of this change in the dislocation structure, contrast factors were deduced in order to convert apparent dislocation densities into true dislocation densities. The latter was found to be in good agreement with residual resistivity data.

T.Ungár, M.Zehetbauer: Scripta Materialia, 1996, 35[12], 1467-73