Effect of Al2O3 Particles on the Hardness,Tensile Strength and Microstructure of dissimilar A2024 Aluminum Alloy to pure Copper FSW joint

In this paper, the effects of Al2O3 particles on the microstructure and the mechanical properties of A2024-Cu dissimilar joint produced by FSW method have been discussed. Al2O3 particles with the mean size of 15μm were injected through the weld zone of the dissimilar A2024-Cu joint before welding to improve mechanical properties. After the welding procedure, the microstructure and microhardness and tensile tests were performed to study the joints. The results of the microstructure analysis by the XRD and EDS showed that CuAl2 and CuAl compounds are produced. Results of the tensile test showed that the joint failed under the tensile strength of 181.7 Mpa and elongation of 2.8% and micro hardness test and hardness profile showed a range of 70 up to 548 HV from the A2024 side to the weld zone and 548 up to 85.1 HV from the weld zone to the Copper side.