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AZ31B镁合金薄板热拉伸显微组织试验研究.docx

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AZ31B镁合金薄板热拉伸显微组织试验研究 【Abstract】 Inthisstudy,themicrostructureandmechanicalpropertiesofAZ31Bmagnesiumalloysheetwereinvestigatedbyhottensiletest.TheresultsshowedthatthegrainsizeoftheAZ31Bmagnesiumalloywassignificantlyrefinedafterhotdeformation,andthestrengthandductilityofthealloywereimprovedaccordingly.ThroughtheanalysisofthemicrostructureandmechanicalpropertiesoftheAZ31Bmagnesiumalloysheet,therelationshipbetweenthegrainsizeandthemechanicalpropertiesofthealloywasexplored.ThestudyprovidesatheoreticalbasisforthefurtherdevelopmentandapplicationofAZ31Bmagnesiumalloysheet. 【Introduction】 AZ31Bmagnesiumalloyisoneofthemostwidelyusedmagnesiumalloysduetoitshighstrength,goodductility,lowdensityandexcellentcorrosionresistance.However,themechanicalpropertiesofAZ31Bmagnesiumalloyarestronglyinfluencedbyitsmicrostructure,especiallygrainsize.InordertoimprovethemechanicalpropertiesofAZ31Bmagnesiumalloy,itisnecessarytostudytherelationshipbetweenmicrostructureandmechanicalproperties.Hotdeformationisaneffectivemethodtorefinegrainsize.Inthisstudy,themicrostructureandmechanicalpropertiesofAZ31Bmagnesiumalloysheetwereinvestigatedbyhottensiletest. 【Experimentalprocedure】 AZ31Bmagnesiumalloysheetwithathicknessof1mmwasusedinthisstudy.ThechemicalcompositionofthealloyisshowninTable1.ThehottensiletestwascarriedoutinaGleeble-3500thermalsimulationmachine,withastrainrateof0.1s-1,andthetemperaturewasrangingfrom350°Cto500°C.Thespecimensweretesteduntilfractureoccurred. Afterthehottensiletest,themicrostructuresofthesampleswereanalyzedusingascanningelectronmicroscope(SEM).Todeterminethegrainsize,theSEMimageswereprocessedbyimageanalysissoftware. 【Resultsanddiscussion】 ThemicrostructureoftheAZ31BmagnesiumalloysheetbeforeandafterhotdeformationisshowninFigure1.ItcanbeseenthatthegrainsizeoftheAZ31Bmagnesiumalloyissignificantlyrefinedafterhotdeformation.Theaveragegrainsizeofthesampleafterhotdeformationat500°Cwasabout5μm,whiletheaveragegrainsizeofthesamplebeforehotdeformationwasabout30μm. Themechanicalproperti