Anisotropy of plastic deformation in rolled aluminum

Tensile properties were investigated along different directions in rolled sheets of recrystallized commercial purity aluminum. The dependence of the flow stress anisotropy on the prestrain level was analyzed in relation to the evolution of the dislocation structure during rolling. The anisotropy of the stress–strain behavior at a prestrain of 0.17 was studied. It is found that the directionality of the planar dislocation boundaries formed during prestraining gives a major contribution to the anisotropic plastic behavior. The magnitude of this contribution depends on the prestrain, which controls the boundary spacing and misorientation.