Mg含量对过共晶铝硅合金组织和性能的影响

235200910()JournalofJiangsuUniversityofScienceandTechnology(NaturalScienceEdition)Vo.l23No.5Oct.2009Mg金云学,付学慧,郭宇航,张艳(,212003):Mg.Mg,XRDEDS,.:,MgMg2S;i,Mg2Si;Mg1%~5%,Mg,.:;Mg2S;i:TB331:A:1673-4807(2009)05-0392-03:2008-09-29:(1964)),,,,.E-mai:[e-mail]ertiesofAl-SihypereutecticalloywithdifferentcontentsofMgJinYunxue,FuXuehu,iGuoYuhang,ZhangYan(SchoolofMaterialsScienceandEngineering,JiangsuUniversityofScienceandTechnology,ZhenjiangJiangsu212003,China)Abstract:ThestructuresandpropertiesofhypereutecticA-lSialloywithdifferentcontentofMgwerestudiedinthispaper.Byusingscanningelectronmicroscopeandmetallographicmicroscope,themicrostructureofthehy-per-eutecticA-lSialloywithdifferentMgcontentandthemicrostructureofalloybeforeandafterheattreatmentwereobserved.TheXRDandEDSwereadoptedtoanalysisthemetalgraphofthedifferentphase.Simultaneous-ly,theHBandHVofdifferentphaseweretested.TheexperimentresultsshowthatthedifferentcontentofMginhypereutecticA-lSialloygeneratesthedifferentformsofMg2S.iHeattreatmentcausesshapechangeoftheeu-tecticsiliconfromlathtobal,landthatoftheChinesecharactersMg2Sitospherica.lWhentheMgcontentisinthescopeof1%~5%,thehypereutecticA-lSialloycshardnessincreaseswithMgconten.tHeattreatmentcansignificantlyincreasetheHBofthealloy.Keywords:A-lS-iMgalloy;Mg2S;iheattreatment,[1-2].[3].,,117,513.,,,,,,[4-5].,[6].,[7-8].,Mg,016%,Mg1%~6%,MgMg2Si,.Mg.第5期金云学,等:Mg含量对过共晶铝硅合金组织和性能的影响39311.199199%20%,1A-l20Si.1Table1ChemicalcompositionofA-lSialloy%SiCuMgFeAl20010050100201097SG2-3-12,3kW,5150mm@200mm,1200e;XMT101(1e);HB-3000;EveroneMH-5.1.2.730e,A-l20Si,016%,15min.Mg,,5min,,,,.,+,525e6h,,175e6h,.,XRDEDS,.22.1MgA-l20Si1730e,w(Mg)XRD,,A-A,lSiMg2Si.A-lS-iMg,:577eLyAl+Mg2S;i555eLyAl+Si+Mg2S.i,A-A,lSiMg2S,iXRD,.A-lSi,,.2730e.--12a),12,A-A,l,Mg2Si.1A-A,l2,3,4Mg2Si.Mg2Si,2b)4Mg2Si,Mg2Si.2c)Mg2Si,3.Mg,Mg2Si,,.Mg,SiMgMg2Si,,2,,MgMg2Si,,.1w(Mg)5%A-l20SiXRDFig.1XRDpatternofA-l20Sialloycontaining5percentMgafterheattreatmenta)w(Mg)=1%b)w(Mg)=3%c)w(Mg)=5%2MgA-l20SiFig.2As-castmicrostructuresofA-l20SialloywithdifferentcontentsofMg394江苏科技大学学报(自然科学版)第23卷2,A-A,lMg2Si.,.2Table2HardnessofthephasesofthetestedmaterialsA-AlMg2Si981248961984561781011181020135460153212Mg525e6h,,175e6h,.2c),Mg2SiAl.3w(Mg)5%,.Mg2Si,,Mg2SiA-Al.3w(Mg)5%A-l20SiFig.3MicrostructuresofA-l20Sialloywithadditionofw(Mg)=5%MgafterheattreatmentMg015%~017%,,,011%~0115%.MgMg2Si.,Mg2Si,.Mg2Si,,.(A-Al+Si+Mg2Si),Mg2Si,Ostwald,,.,Mg2Si,.3:Mg,Mg2Si,Mg2Si.,.,,,.3Table3TheHBSofmaterialsw(Mg)=1%w(Mg)=3%w(Mg)=5%10811512413013514531)MgMg2S,iMg2Siw(Mg)1%,w(Mg)3%,w(Mg)5%Al;2)Mg2Si,,,;3),Mg,Mg.(References)[1]YeHaizh.iAnoverviewofthedevelopmentofA-lS-ialloybasedmaterialforengineapplications[J].JournalofMaterialEngineeringandPerformance,2003(12):288-297.[2]PrasadSV,AsthanaR.Aluminummeta-lmatrixcompos-itesforautomotiveapplications:tribologicalconsiderations[J].TribologyLetters,2004,17(3):445-452.[3].[M].:,1988.[4].[J].,2006(3):88-89.YangZuotao.Brakediscintheautomobile[J].Automo-bileandAccessory,2006(3):88-89.(inChinese)(下转第398页)398江苏科技大学学报(自然科学版)第23卷,:1),.2),,.,,.30MPa,,.3),,,.,,.,.(References)[1]ValievRZ,IslamgalievRK,AlexandrovIV.Bulknanostructuredmaterialsfromsevereplasticdeformation[J].ProgMaterSci,2000,45(2):103-189.[2]ValievRZ,LangdonTG.Principlesofequa-lchannelangularpressingasaprocessingtoolforgrainrefinement[J].ProgMaterSci,2006,51(7):881-981.[3].ECAP[J].:,2006,20(2):85-88.ShiFengjian.Microstructureandpropertiesofpurecop-perfabricatedbyequalchannelangularpressing[J].JournalofJiangsuUniversityofScienceandTechnology:NaturalScienceEdition,2006,20(2):85-88.(inChinese)[4]TsaiTL,SunPL,KaoPW,eta.lMicrostructureandtensilepropertiesofacommercial5052aluminumalloyprocessedbyequalchannelangularextrusion[J].MaterSciEng,2003,A342(112):144-151.[5]SemenovaIP,RaabGI,SaitovaLR,eta.lTheeffectofequa-lchannelangularpressingonthestructureandmechanicalbehaviorofT-i6A-l4Valloy[J].MaterSciEng,2004,A387-389:805-808.[6]FigueiredoRB,KawasakiM,XuC,eta.lAchievingsu-perplasticbehaviorinfccandhcpmetalsprocessedbye-qua-lchannelangularpressing[J].MaterSciEng,2008,A493(112):104-110.[7]DingSX,LeeWT,ChangCP,eta.lImprovementofstrengthofmagnesiumalloyprocessedbyequalchannelangularextrusion[J].ScriptaMater,2008,59(9):1006-1009.[8]KimHS,SeoMH,HongSI.Onthediecornergapfor-mationinequalchannelangularpressing[J].MaterSciEng,2000,A291(112):86-90.[9]LapovokR.Thepositiveroleofback-pressureinequalchannelangularextrusion[J].MaterSciForum,2006,(503/504):37-44.[10]IwahashiY,WangJT,HoritaZ,eta.lPrincipleofequa-lchannelangularpressingfortheprocessingofu-ltra-finegrainedmaterials[J].ScriptaMater,1996,35(2):143-146.(责任编辑:贡洪殿)(上接第394页)[5],,.[J].,2001,18(2):89-92.QiHaibo,FanYunchang,DingZhanla.iApplicationoftheparticularreinforcedaluminumcompositetoautomo-bilebrakerotors[J].JournaloftheHebeiAcademyofSci-ences,2001,18(2):89-92.(inChinese)[6],,.A-lS-iCu-Mg[J].,2007,17(2):193-199.LiRunxia,LiRongde,L™we.iEffectsofsolutionheattreatmentonmicrostructuresandpropertiesofA-lS-iCu-Mgcastalloys[J].TheChineseJournalofNonferrousM