Deformation induced dislocation boundaries: Alignment and effect on mechanical properties

The dislocation boundaries formed during cold-rolling of FCC metals have been reported to have a preferred macroscopic direction with respect to the sample axes. However, boundaries have also been reported to form on crystallographic slip planes. The directions of the boundaries formed on crystallographic slip planes are investigated using a newly developed model for formation of such boundaries.

It is concluded that these boundaries also lie in the preferred macroscopic direction, i.e. the entire dislocation structure is highly anisotropic. The impact of the anisotropic dislocation structure on the flow stress anisotropy is illustrated by comparison of experimental data and model calculations which take the combined effects of the anisotropic dislocation structure and texture into account. (C) 1997 Elsevier Science B.V.