MODELING FLOW-STRESS ANISOTROPY CAUSED BY DEFORMATION-INDUCED DISLOCATION BOUNDARIES

Models have been developed for the combined effect of texture and micr ostructure on the flow stress anisotropy of metals containing dislocat ion boundaries with a macroscopic orientation with respect to the samp le axes. These are the Taylor and the Sachs models modified to include the anisotropic critical resolved shear stress from the dislocation b oundaries. The model predictions have shown that the presence of dislo cations in an idealized configuration has a significant effect on the anisotropy caused by the crystallographic texture. These model predict ions have been tested for a number of materials parameters. Modelling results have finally been compared with measurements of flow stress an isotropy in aluminium sheets cold rolled 18%, and good agreement has b een found. (C) 1997 Acta Metallurgica Inc.