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MetallographicCharacterizationonMicrostructureandDefectsofAluminumAlloyFrictionStirWeldingJoints

GUOHaixia(LuoyangShipMaterialResearchInstitute,Luoyang£´£·£±£°£²£³,China)

Abstract:Themetallographiccharacterizationofaluminumalloyfrictionstirweldingjointswasintroducedandsummarizedfromthreeaspects:jointlow magnificationmorphology,microstructurecharacteristicsofvariousregions,anddefectcharacteristics£®Theresultsshowthattherewerethreekindsofmacromorphology,includingriverbedstyle,drumstyleandkettlemouthstyle£®Themicroscopiccharacteristicsofthejointscouldbeanalyzedfromtwoaspectsofrecrystallizationandsecondphasedistribution£®Theessenceofonion£Çringdefect wasthealternatedistributionofunequalsizerecrystallizedgrainsordifferentnumberofdispersephaseparticles£®TheZ£Çshapedlinedefectwasformedbythediffusedistributionoftheoxidefilmontheoriginalinterface£®Thekissing£Çbonddefectandthehook£Çshapeddefectwerepseudoconnectiondefects£®Theholedefectandtunnelshapeddefectweremainlycausedbytheinsufficientheatinputduringtheweldingprocess£®

Keywords:frictionstir welding;aluminum alloy;metallographiccharacterization;macro morphology;

microstructure;defect


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