Abstract
This study explores the influence of multidirectional forging (MDF) on the mechanical strength and superplastic behavior of AA7075 aluminum alloy. The material, initially processed by hot extrusion, underwent severe plastic deformation (SPD) through MDF. Evaluations of mechanical enhancement were performed using both microhardness and tensile tests. After completing three and four MDF cycles, the alloy exhibited microhardness improvements of 48% and 60%, respectively. Corresponding increases in tensile strength were 22.45% and 40.8% relative to the untreated samples. Superplastic deformation experiments were carried out at 530 °C using strain rates of 10–4 S–1, 10–3 S–1, and 10–2 S–1. The superplastic characteristics were assessed through the measurement of elongation and flow stress during tensile loading. The best performance was achieved after four MDF passes at a strain rate of 10–3 S–1, yielding a maximum elongation of 350% and a flow stress of 9 MPa. These findings highlight the effectiveness of MDF in improving the strength and ductility of high-performance aluminum alloys while preserving their capacity for extensive plastic deformation.