Effect of Nd on Properties and Microstructure of ER5183 Aluminum Welding Wire and Welded Joints
ZHANG Fan1, XUE Songbai1, WANG Bo2,HUANG Zhiheng1, LONG Weimin2
1 College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China 2 China Intelligent Equipment Innovation Research Institute Co., LTD., Ningbo 315700, Zhejiang, China
Abstract: The effect of element Nd addition on the microstructure of 5183 aluminum welding wire and the mechanical properties of the corresponding welded joint were investigated. When Nd element content is less than 0.4wt%, with the increase of Nd element content, the net-like distribution of the secondary phase in 5183 as-cast alloy is restrained, which gradually presents granulated distribution.In this situation, tensile strength and plasticity of continuous casting of aluminum wire with a diameter of 8.0 mm are increased and the grains in 5083 aluminum alloy weld area is obviously refined.As a result, the joint strength and ductility of the joint are also further increased. When 0.4wt% Nd is added, the tensile strength and elongation after fracture are 300 MPa and 24%, respectively, which are increased by 14% and 50% compared with that without Nd.The tensile strength and elongation after fracture of joints are 310 MPa and 17.3%, which are about 19% and 55% higher than those without Nd, respectively. The strength and plasticity of joints welded by this welding wire are significantly improved, and the microhardness of different areas of the weld are improved compared with those without Nd.When Nd addition reaches 0.5wt%, the refinement of Nd element on the secondary phase is weakened and the tensile strength of continuous cast aluminum wire is increased slightly with a decreased plasticity. Although the weld microstructure is further refined, the deterioration of microstructure uniformity brings an obvious decrease in both tensile strength and plasticity of the weld. Therefore, in this work, in order to improve the performance of welding wire and the corresponding weld, the optimal addition amount of Nd is 0.4wt%.
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2023, Vol. 37 
