Cold Rolling Effect on Mechanical Properties and Fracture Toughness Behavior of AA1050 Aluminum Alloy

The present paper reveals an experimental investigation of the effect of cold rolling (CR) on the mechanical properties and fracture toughness behavior of AA1050 H16 aluminum alloy. The received materials were cold rolled at different percentage of cold rolling (25%, 50% and 75%). The mechanical tensile properties of the specimens with different cold rolling percentage were determined by monotonic tensile test along two directions (RD: rolling direction, TD: transversal direction). Besides, the fracture toughness behavior of the cold rolled and as received alloy was evaluated by fracture toughness test using central cracked panels (CCP) specimens along two direction (RD and TD). ASTME1820 standard was used to evaluate the fracture toughness parameter J 0.2 and J-Aa curves. Experimental results found that the cold rolling has profound effect on resistance anisotropy which improves with the amount of %CR. The highest strength and fracture toughness were shown in the longitudinal direction in the studies alloy. In addition, cold rolling has been found to have an important effect on the decrease in fracture toughness parameter of the alloy which increases with the amount of %CR. The examination of the fracture surfaces with the scanning electron microscope (SEM) shown dimpled morphology for the ductile fracture mechanism in the received material and quasi -cleavage areas in cold-rolled specimens, corresponding to ductile to brittle fracture mechanism.