Severe plastic deformation of Al strips through equal multi and single channel angular pressing

Abstract

Equal channel multi-angular pressing (ECMAP) and equal channel angular pressing (ECAP) of Al-1050 strips were carried out. The ECMAP and ECAP load-displacement behavior, peak load, microhardness distribution maps, homogeneity, and average values were investigated. Finite element simulations (FEM) of the ECMAP and ECAP were performed using the DEFORM-3D program. The experimental and FEM load-displacement curves were close to each other, with deviations between the FEM and experimental peak loads of 2.3-9.5 and 0.9-3.1% in the ECMAP and ECAP. The ECAP experimental and FEM peak loads were lower by 149.4-163.4 and 127.9-151.8% than that of the ECMAP after one to three passes. FEM average effective plastic strain was obtained with high accuracy in the different plans. The ECAP sample's deformation homogeneity was higher by 19-62.6% relative to that of ECMAP samples. The microhardness results verify the 3D FEM simulation one that ECAP samples have a higher deformation homogeneity. Moreover, the average microhardness values of ECAP samples were higher by 4.5-13.3% than the ECMAP samples in the different plans. ECAP processing of Al-1050 strips is recommended rather than using ECMAP to produce large samples with a higher degree of deformation homogeneity and microhardness.