Modeling compression reloads in copper prestrained by equal channel angular extrusion (ECAE)

Abstract

When copper is deformed to large strains, as in Equal Channel Angular Extrusion (ECAE), its texture and microstructure change drastically and lead to plastic anisotropy upon reloading. In this work, we develop a multi-scale model that accounts for both texture and subgrain microstructural evolution. Specifically the evolution of directional anisotropy in the single crystals is induced by the formation of planar dislocation walls. The model successfully predicts the flow responses of copper strained by a single pass of ECAE and subsequently compressed in each of three orthogonal directions. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.