钕对ER5183铝合金焊丝及接头性能与组织的影响研究  

Effect of Nd on Properties and Microstructure of ER5183 AluminumWelding Wire and Welded Joints

作　　者：张帆 薛松柏[1] 王博 黄智恒 龙伟民 ZHANG Fan;XUE Songbai;WANG Bo;HUANG Zhiheng;LONG Weimin(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;China Intelligent Equipment Innovation Research Institute Co.,LTD.,Ningbo 315700,Zhejiang,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]中机智能装备创新研究院(宁波)有限公司,浙江宁波315700

出　　处：《材料导报》2023年第11期166-170,共5页Materials Reports

基　　金：国家自然科学基金(51975284)。

摘　　要：研究了稀土钕对ER5183铝合金焊丝及接头性能与组织的影响。结果表明,当Nd元素添加量为0.1%~0.4%(质量分数)时,随着Nd元素含量的增加,ER5183铸态合金第二相沿晶界网状分布的趋势受到抑制,逐渐变为颗粒状弥散分布,直径8.0 mm的连铸铝线材的抗拉强度和塑性大幅提高,5083铝合金焊缝区晶粒细化程度逐渐提高,接头抗拉强度和塑性也显著增强。当添加0.4%(质量分数)Nd时,连铸铝线材的抗拉强度和断后伸长率分别为300 MPa、24%,较未添加Nd分别提高了约14%、50%;接头抗拉强度和断后伸长率分为310 MPa、17.3%,较未添加Nd分别提高了约19%、55%,接头焊缝区域的显微硬度也增大。进一步增加Nd元素添加量至0.5%(质量分数)时,第二相沿晶界开始偏聚,连铸铝线材的抗拉强度略有提高但塑性下降,焊缝区晶粒进一步细化但组织均匀性恶化,接头强度和塑性都开始下降。综上,Nd在5183焊丝中的添加量为0.4%(质量分数),对于提升焊丝以及焊缝的综合性能最佳。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%.

关 键 词：Nd元素 5183铝焊丝 显微组织 力学性能 

分 类 号：TG422.3[金属学及工艺—焊接]