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稀土镁合金搅拌摩擦焊焊缝组织及性能研究.docx

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稀土镁合金搅拌摩擦焊焊缝组织及性能研究 Title:MicrostructureandPerformanceInvestigationofRareEarthMagnesiumAlloyStirFrictionWeldingJoints Abstract: Rareearthmagnesiumalloyshaveemergedaspromisingmaterialsduetotheirexcellentmechanicalandphysicalproperties.Inthisstudy,themicrostructureandperformanceofstirfrictionweldedjointsofrareearthmagnesiumalloyswereinvestigated.Theaimwastounderstandtheinfluenceoftheweldingparametersonthemicrostructureandmechanicalpropertiesofthejoints. 1.Introduction: 1.1Background Rareearthmagnesiumalloyshaveattractedsignificantattentioninrecentyearsduetotheirhighstrength-to-weightratio,excellentcorrosionresistance,andsuperiorthermalstability.Thesealloysarewidelyusedinindustriesrequiringlightweightstructures,suchasaerospace,automotive,andelectronicindustries. 1.2ResearchPurpose Thisstudyaimedtoanalyzethemicrostructureandmechanicalpropertiesofstirfrictionweldedjointsofrareearthmagnesiumalloys.Theeffectofweldingparameters,includingrotationspeed,travelspeed,andaxialloadonthejoints'characteristics,wasinvestigated. 2.ExperimentalProcedure: 2.1MaterialSelection Rareearthmagnesiumalloysampleswerepreparedandcharacterizedfortheirchemicalcompositionandmechanicalproperties. 2.2StirFrictionWelding Thestirfrictionweldingprocesswasperformedusingaspecializedweldingmachine.Differentweldingparameterswereconsideredtoobservetheireffectsonthejoint'smicrostructureandproperties. 2.3MicrostructureAnalysis Themicrostructureoftheweldedsampleswasanalyzedusingopticalmicroscopyandscanningelectronmicroscopywithenergy-dispersivespectroscopy.Thegrainstructure,intermetallicphases,andthepresenceofanydefectsoranomalieswereexamined. 2.4MechanicalPropertyEvaluation Tensiletestingwasconductedtoevaluatethemechanicalpropertiesofthestirfrictionweldedjoints,includingultimatetensilestrength,yieldstrength,andelongation.Hardnesstestingwasperformedtoassessthejoint'shardnessdistribution. 3.ResultsandDiscussion: 3.1MicrostructuralAnalysis Themicrostructureofthestirfrictionweldedjointsexhibitedarefinedgrainstruct