Effect of Strain in Cold ECAP by Rota C in Mechanical Behavior and Homogeneity of AA1070 AL Alloy

The aim of this study is evaluate the mechanical behavior of an Al AA1070 aluminum alloy produced from rolling hot process, by equal channel angular pressing (ECAP). The process is cold via route C with 5 consecutive passes and accumulated a total strain of ɛ5 = 5.95. The as received material has a coarse grain micro structure with grain size of 15.7 ± 17.5 μm and micro hardness Vickers 31.1 ± 2.5. The mechanical behavior and micro hardness Vickers of the samples were evaluated by tests of Vickers hardness, creation of hardness maps and force-deformation graph during the ECAP process. It was observed that the mechanical properties of the material changed with an increase of hardness approximately 50% from 31.1HVto 46.6 HV and increased strength of the material in view of the force required for the passage of the billet through the die was 40% higher in the later passes to the first. The hardness maps presented heterogeneously and became more uniform over the processing passes fact in agreement with the observed standard deviations. The ECAP process was effective only until the second pass processing.