电焊机2024，Vol.54Issue(7)：83-92,10.DOI:10.7512/j.issn.1001-2303.2024.07.12
转速对铝铜异种金属薄板搅拌摩擦焊接头组织与性能的影响
Effect of Rotation Speed on Microstructure and Properties of Friction Stir Welded Joint of Aluminum/Copper Dissimilar Metal Sheet
摘要
Abstract
The microstructure and mechanical properties of friction stir welded butt joints of aluminum-copper dissimilar metal sheets at different rotational speeds(1600～2000 r/min)were studied,which provided a reference for the development of copper-aluminum thinner composite components.Under the condition of 1600～2000 r/min,the friction stir welding(FSW)method was used to weld the copper-aluminum sheet.After the welding was completed,the macroscopic morphology of the welded joint was observed by metallographic microscope.The microstructure of the welded joint was observed by scanning electron microscope(SEM).The element change of the welded joint was studied by X-ray energy dispersive spec-trometer(EDS).The phase of the intermetallic compounds(IMCs)was studied by X-ray diffractometer(XRD).The mi-crohardness of the welded joint was studied by micro Vickers hardness tester.The tensile properties of welded joints were studied by tensile testing machine.It is found that the welded joints with good surface quality can be obtained at different ro-tational speeds(1600～1800 r/min).When the rotational speed is further increased,the surface quality is further improved.Complex microstructure was produced at the interface of aluminum matrix and copper matrix,and two intermetallic com-pounds,Al2Cu and Al4Cu9,were produced.With the increase of rotational speed,the thickness of IMCs also increased.The peak value of microhardness appears in the weld nugget zone,and the average microhardness is higher than that of the cop-per side and the aluminum side.The fracture modes of the joints at different rotational speeds are all in the form of ductile-brittle mixed fracture,and the fracture positions are all broken at the copper-aluminum butt joints.When the welding speed is 30 mm/min and the rotation speed is 1 800 r/min,the surface quality of the joint is the best and the interface structure is the best.The thickness of the IMCs is 2.65 μm,and the tensile strength of the joint can reach the maximum,which is suit-able for the development of thin copper-aluminum composite components.关键词
搅拌摩擦焊/铜铝异种接头/转速/金属间化合物/力学性能Key words
FSW/Al/Cu dissimilar joint/stirring needle speed/IMCs/mechanical property分类
矿业与冶金引用本文复制引用
杨瑞琛,王进,高波,张帅,张新月..转速对铝铜异种金属薄板搅拌摩擦焊接头组织与性能的影响[J].电焊机,2024,54(7):83-92,10.基金项目
山东省重点研发计划(2019GGX102023) （2019GGX102023）
国家自然科学基金青年基金(523010090) （523010090）
山东省自然科学基金青年基金(ZR2023QE275) （ZR2023QE275）
