锡铅锆元素对镁合金组织及性能影响-effect of sn, pb and zr on microstructure and properties of magnesium alloy.docx

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2018-08-07 发布于上海
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锡铅锆元素对镁合金组织及性能影响-effect of sn, pb and zr on microstructure and properties of magnesium alloy.docx

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锡铅锆元素对镁合金组织及性能影响-effect of sn, pb and zr on microstructure and properties of magnesium alloy

AbstractInthispaper,thedevelopmentofhighformabilityofmagnesiumalloyforresearchbackground,basedonboththeexistingresearchresultsandexistingproblems,andinordertoimprovethestrengthandtoughnessofmagnesiumalloysasthemainlinetoproceedfromthecontrolofalloycomposition,microstructureandproperties,thegasstirmeltingprocessandmethodofmetaltypecastingwereusedtoproducemagnesiumalloysofMg-Snsystem,Mg-Sn-PbsystemandMg-Sn-Pb-Zrsystem.TheeffectofSn,Pb,andZrelementsonmicrostructureandmechanicalpropertiesofmagnesiumalloyatroomtemperaturewerestudied,andfracturemechanismofexperimentalloyswerealsostudied.TheGleeble-3500thermal-mechanicalsimulationtesterwasusedtostudythermalcompressivedeformationbehaviorofexperimentmagnesiumalloys,andtheplasticdeformationbehaviorofthealloywerecomparisonanalyzed.As-castorganizationofMg-xSn(x=2,4,6,8)alloyswerecomposedbyα-MgandMg2Snphase.ThemicrostructureofpuremagnesiumwaschangedbytheadditionofSn.ThemicrostructureandpropertiesofMg-4Snalloyweremostoptimal,itstensilestrengthandelongationratereached112.9MPaand10%,respectively.ThefracturemodeofMg-4Snalloyexhibitedthecharacteristicofquasi-cleavagefracture.AfterPbelementwasaddedintoMg-4Snalloy,themicrostructureofas-castalloysconsistofα-MgandMg2Snphase.TheadditionofPbelementcaninhibittheprecipitationofMg2Snphaseontheboundary,reducetheamountofMg2SnphaseandchangethemorphologyofMg2Snphasetoshortrod-shaped.Pbelementdissolvesinα-MgmatrixandexistsintheMg2Snphase.WhenthePbcontentis2.5%,thetensilestrengthandelongationrateofthetestalloyarebetterthanthatofMg-4Snalloy,reached114.05MPaand12.48%,respectively,whilethehardnessofMg-4SnalloyisreducedbyadditionofPb，thefracturemodeofMg-4Sn-2.5Pballoyexhibitedthecharacteristicofquasi-cleavagefracture.AfterZrelementwasaddedintoMg-4Sn-2.5Pballoy,themicrostructureofas-castalloysconsistofα-Mg,Mg2SnandZrphase.TheadditionofZrelementdidnotsignificantlyrefinethegrainsize,andthereweretrendthatmakeprecipitatesalongthegrainboundaryprecipitatelikemesh.WhentheZrcontentis1.0%,thegrainsizeofmagnesium