Effect of Equal-channel Angular Pressing on Microstructure and Mechanical Properties of 5083 Al Alloy

The mechanical properties of equal-channel angular pressing(ECAP) 5083 Al alloy were investigated under room-temperature tension.The results show that 5083 Al alloy squeezed by ECAP process at 100℃ for 16 passes induces a remarkable grain refinement and a homogeneous dispersion distribution of second phases,and its tensile strength can reach as high as 480 MPa;the 5083 Al alloy squeezed by ECAP process at 200℃ for 16 passes,its strength reduces(about 380 MPa) but plasticity markedly improves(elongation above 16%);Reducing ECAP temperature and increasing ECAP passes can obtain the effect of higher extrusion hardening and fine-grain strengthening of the alloy.The combination of ECAP at 100℃ and subsequent annealing at 200℃ could simultaneously enhance its tensile strength and plastic deformation ability.