Severe Plastic Deformation by ECAP and Rolling: The Influence of Deformation Path on Strain Distribution

V. SORDI; N. S. DE VINCENTIS; N. SCHELL; H-G. BROKMEIER; A. KLIAUGA; R.E. BOLMARO

Cancún

Congreso; XXV International Materials Research Congress; 2016

On the current work the strain distributions induced by equal channel angular pressing (ECAP) and conventional rolling processes on some fcc alloys: aluminium, copper, and austenitic stainless steel, are compared. The accumulated strain was measured by Vickers hardness test and the tensile behaviour after deformation by tension tests. Williamson-Hall and Convolutional Multiple Whole Profile (CMWP) techniques were applied to peak broadening analysis on experimental results stemming from laboratory Cu Kα X-rays, and synchrotron radiation from the LNLS (LaboratórioNacional de Luz Síncrotron, Campinas, Brazil) and the Petra III line (HEMS station, at DESY, Hamburg, Germany). The average dislocation density increased with strain while the individual crystalline size became smaller and yield strength increased. These quantities obeyed the Taylor relationship. When rolling is compared to ECAP, the former process produces small diffraction domains, similar or smaller than the obtained by ECAP processing, but with the particularity of still allowing a highly preferred orientation of the crystals, i.e. strong texture and a more heterogeneous distribution of dislocations within the texture components.