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搅拌头的外形和工艺参数对搅拌摩擦焊Al-Cu接头显微组织和力学性能的影响（英文）.docx

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搅拌头的外形和工艺参数对搅拌摩擦焊Al-Cu接头显微组织和力学性能的影响（英文） Title:TheInfluenceoftheShapeandProcessParametersofStirringHeadontheMicrostructureandMechanicalPropertiesofFrictionStirWeldedAl-CuJoints Abstract: Frictionstirweldinghasemergedasapromisingtechniqueforjoiningdissimilarmaterialsduetoitsadvantagesovertraditionalfusionweldingmethods.Inthisstudy,theeffectsoftheshapeandprocessparametersofthestirringheadonthemicrostructureandmechanicalpropertiesoffrictionstir-weldedAl-Cujointswereinvestigated.Asystematicexperimentalapproachwasemployedtoexploretheoptimalsetofparametersforachievinghigh-qualitywelds. Introduction: Frictionstirwelding(FSW)isasolid-statejoiningprocessthathasgainedsignificantattentioninrecentyears.Itoffersnumerousadvantagessuchaslowdistortion,absenceofsolidificationdefects,andbettermechanicalpropertiescomparedtofusionweldingtechniques.FSWinvolvestheuseofarotatingstirringtooltogeneratefrictionalheat,whichsoftensthematerialandfacilitatesitsdeformation.Thejointformationisachievedthroughtheplasticizedmaterialbeingstirredandconsolidatedunderthepressureappliedbythetool. Methods: Inthisstudy,AA6061-T6aluminumalloyandpurecopperwithathicknessof3mmwereselectedasthebasematerials.TheAl-CujointswerefabricatedusinganFSWmachineequippedwithdifferentstirringheads.Theparametersinvestigatedincludedstirringheadshape,rotationalspeed,traversespeed,andaxialforce.Themicrostructureandmechanicalpropertiesoftheweldswereevaluatedusingopticalmicroscopy,scanningelectronmicroscopy,andmechanicaltesting. Results: TheresultsshowedthattheshapeofthestirringheadsignificantlyinfluencedthemicrostructureandmechanicalpropertiesoftheAl-Cujoints.Twotypesofstirringheads,cylindrical-pinandtaper-pin,werecompared.Thecylindrical-pinheadproducedauniformandrefinedmicrostructurewithwell-dispersedCuparticlesinthealuminummatrix.Ontheotherhand,thetaper-pinheadresultedinacoarsemicrostructurewithagglomeratedCuparticlesatthejointinterface.Themechanicalpropertiesoftheweldsfabricatedusingthecylindrical-pinheadwerefoundtobesuperior