Study on the Mechanical Properties and Microstructures of Pure Aluminum L2 Processed by Equal Channel Angular Pressing

Equal Channel Angular Pressing (ECAP) is one of ultra-fine grain preparing techniques,which can refine the structure of alloys and improve the capacities of materials.The results show that the tensile strength of pure aluminum L2 increases with pressing times of ECAP and reach its limit after pressing 8 times.The elongation decreases severely from 40% to 15% after the first pressing,but it increases slightly after 4 or 5 times pressing.The hardness also increases with pressing times and reaches saturated appearance after pressing 3 or 4 times.with increase of the pressing times,the initial grains of pure aluminum L2 with about 1 mm equiaxed grains change into fine equiaxed grains.The size of grains is approximately 1 μm after pressing 8 times.