DEFORMATION-INDUCED DISLOCATION BOUNDARIES - ALIGNMENT AND EFFECT ON MECHANICAL-PROPERTIES

The dislocation boundaries formed during cold-rolling of FCC metals ha ve been reported to have a preferred macroscopic direction with respec t to the sample axes. However, boundaries have also been reported to f orm 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 o f the anisotropic dislocation structure on the flow stress anisotropy is illustrated by comparison of experimental data and model calculatio ns which take the combined effects of the anisotropic dislocation stru cture and texture into account. (C) 1997 Elsevier Science B.V.