The arrangement of dislocation cells in a commercial alloy (AA1145) which had been subjected to uniaxial tensile deformation at 150C, to a true strain of 0.1, was investigated by using transmission electron microscopic and convergent-beam electron diffraction techniques. Misorientations between neighboring dislocation cells and misorientation gradients across the grains, as well as dislocation boundary orientations, were analyzed. The results of a detailed crystallographic analysis of a typical cell arrangement were presented. The results obtained here were compared with those available for similar deformation conditions at room temperature. It was concluded that the observed cell structure had a complex hierarchical character and neither the misorientation vector distributions nor the dislocation boundary orientations corresponded to the simple checkerboard arrangement of cells that was predicted by the above theory.

P.Cizek, B.A.Parker, D.G.McCulloch: Materials Science and Engineering A, 1995, 194[2], 201-10