: In the present study, 5083 Aluminum alloy was subjected to cryogenic rolling process. The main objective was optimization of structure and mechanical properties of a 5083Al alloy. For this purpose, parameters such as strain and temperature of final annealing treatment were evaluated. After solid solution treatment at 510 degC for 2 hrs, the specimens were subjected to rolling up to 35, 60 and 85% reduction at cryogenic temperature. Then, for improving the strength and ductility, they were subjected to annealing treatment to determine the optimal temperature and time. Microstructural studies were investigated by using Scanning electron microscopy (SEM) and optical microscopy. Vickers hardness and tensile testing were performed at room temperature to evaluate the mechanical properties. Dislocation density was also calculated by XRD tests. It was found that solution treatment, rolling up to 85% reduction and final annealing at 180 degC for 1 hrs are the optimized parameters. By applying these parameters, the hardness of 121 Hv, ultimate tensile strength of 460 MPa and ductility of 10% tensile elongation was achieved. Results showed that the low temperature in cryogenic rolling prevented the dynamic recovery during deformation. Therefore a high density of dislocation will remain which can act as a potential recrystallization sites for Al 3 Mg 2 phase precipitates in final annealing step. By this process, a good combination of strength and ductility was achieved in 5083 Aluminum alloy. Keywords: cryorolling; 5083 Aluminum Alloy; ultrafine grain; nanostructure; mechanical properties
