铸造A356铝合金的微观组织及其拉伸性能研究

A356710049T6A356A356-T62!m100nmMg2SiT6A356AI8Si6Mg3FeA356DCSSDASSi55!m63!m20!m10!mA35650!m75!m30!m13!mA356-T6240Mpa254.8Mpa1.16%A356TG146.2TG113.1TG113.2A0254-6051200703-0013-06MicrostructureandTensilePropertiesofCastA356AluminumAlloyRANGuangZHOUJing-enWANGYong-fangXISheng-giStateKeyLaboratoryforMechanicaIBehaviorofMateriaIsSchooIofMateriaIsScienceandEngineeringXi*anJiaotongUniversityXi*anShaanxi710049ChinaAbstractThecastA356aIuminumaIIoywaspreparedusingtheIostfoamprocessandthenheattreatedbyT6technoIo-gy.ThemicrostructuremicrostructuraIparametervaIuetensiIepropertiesandtensiIefracturesurfaceoftheaIIoywereobservedandanaIyzed.TheresuItsshowntheneedIe-shapedMg2SiparticIeswithIengthofabout2!mandwidthof100nmorseveraInanometersandeIIipticaI-shapedAI8Si6Mg3FeintermetaIIicparticIeswereobservedinthecastA356-T6a-IuminumaIIoy.OuantitativemetaIIographicexaminationresuItsshowntheaveragevaIueofdendriteceIIsizeDCSsec-ondarydendritearmspacingSDASIengthandwidthoftheeutecticsiIiconparticIesoftheas-castA356aIuminumaI-Ioywere55!m63!m20!mand10!mrespectiveIycorresponding50!m75!m30!mand13!mforthecastA356-T6aIuminumaIIoyrespectiveIy.ThetensiIefracturemechanismofcastA356-T6aIuminumaIIoyreveaIedatran-granuIarmodeIaIongtheceIIfracturewithguasi-cIeavagefeature.TheyieIdstrength!0.2uItimatetensiIestrength!bandeIongationofA356-T6aIIoywere240Mpa254.8Mpaand1.16%respectiveIy.KeywordscastA356aIuminumaIIoyguantitativemetaI[e-mail]2006-07-301-44-61%50%20%7-8AI-Si7-MgA3569SrA35610-18A356SrA356A3561A356700C680C30minA3561A356T6538C5h70C+1h+160C4h3120073231A356%Table1ChemicalcompositionofthecastA356aluminumalloywt%SiMgFeTiSrAI7.200.390.090.l350Xl0-60.05BaIanceA356A356-T60.5!mMeF3SISC-IASV6.0DendriteCeIISizeDCSSecondaryDendriteArmSpacingSDASDCSDCS=!#l!#lSDAS!#A356A356-T6lmm60!mJEM-200CXA356-T6GB/T2282002A356-T60.008s-lS-2700A356-T622.1l2A356A356-T6AI-SiA356AIAI-SiMg2SiSiA356!-AISiMg2Sil9la2a!-AIFeFelc2bl9A356AI5FeSi#AI9FeMg3Si5A356Si!-AIlb2b538CAI-Si-Mg!-AIlb2bSil2l2lbMg2SiMg2Si!-AI20A356T6538ClhMg2SiMg2Si4lA356abcFig.lTheopticaImicrographsshowingmicrostructureofas-castA356aIuminumaIIoyaIowpowermicrographsbeutecticsiIiconandshrinkagecavityciron-bearingcompoundparticIes4l20073232A356-T6abfig.2TheopticalmicrographsmicrostructureoftheA356-T6aluminumalloyalowpowermicrographsbeutecticsiliconironbearingcompoundparticlesanddefectsA356DCSSDASSi2360%55!m50!m63!m75!mSi20!m30!m10!m13!m1b2b2A356/A356-T6Table2ThemicrostructureparametersofcastA356/A356-T6aluminumalloy195%C.l.A356A356-T6/!m2014.53016/!m1012.71312.42.12.6DCS/!m5515.15014SDAS/!m63167517.53A356abcdfig.3Thestatisticanalysisresultsofmicrostructureparametersofas-castA356alloyandA356-T6aluminumalloyadendritecellsizebsecondarydendritearmspacingclengthofSiparticledwidthofSiparticle4A356-T62!m100nm4a5120073234aA4bMg2Si4c4cB4dAl8Si6Mg3fe2.2A356-T6A356-T6335A356-T6555a5b5c5d4A356-T6acbaAdcBfig.4TEMimagesandcorrespondingselectedareaelectrondiffractionSEDpatternofcastA356-T6aluminumalloyacbrightfieldbSEDpatternofparticleAdSEDpatternofparticleB5A356-T6abcdfig.5TensilefractographsimagesofthecastA356-T6aluminumalloyalowpowerfracturemorphologybmicroscopicfracturemorphologycinclusiondpore6120073233A356Table3TensilepropertiesofthecastA356aluminumalloypreparedbydifferentmethod!0.2/Mpa!b/Mpa%A356-T6240254.81.16A356-T6211862625A356-T6212072786.03A356-T61.3=1.16%A356-T623%211.06A356-T61.41A356-T61.346Al-Si-Mg22McLellanA356A356DASDASDASSiDAS22A356DAS30!m3.1A356-T620140!m50!m130!m3T6A356A356-T61A356Si#-Al2A356-T62!m100nmMg2SiT6A356Al8Si6Mg3Fe3A356Si55!m63!m20!m10!mA356-T650!m75!m30!m13!m4A356-T6240Mpa254.8Mpa1.16%1ZhaoHong.Applicationofaluminumfortheautomotivein-dustryJ.AutomotiveTechnologyandMaterials1997119-24.2JamborABeyerM.Newcars-newmaterialsJ.MaterialsandDesign1997184/6203-209.3MillerWSetal.RecentdevelopmentinaluminumalloysfortheautomotiveindustryJ.MatSciEngA200020837-49.4MayerHetal.InfluenceofporosityonthefatiguelimitofdiecastmagnesiumandaluminumalloysJ.IntJFatigue200325245-256.5WangOGApelianDLadosDA.FatiguebehaviorofA356-T6aluminumcastalloys.partIEffectofcastingdefectsJ.JournalofLightMetals2001173-84.6AvalleMetal.Castingdefectsandfatiguestrengthofadiecastaluminumalloyacomparisonbetweenstandardspeci-mensandproductioncomponentsJ.IntJFatigue2002241-97CatonMJ.predictingfatiguepropertiesofcastaluminumbycharacteringsmall-crackpropagationbehaviorD.Universi-tyofMichigan.AmArborMI2001.8Buffie~reJYSavellibSJouneaupH.ExperimentalstudyofporosityanditsrelationtofatiguemechanismsofmodelAl-Si7-Mg0.3castAlalloysJ.MaterialsScienceandEngi-neeringA2001316115-126.9KwaiSChanpeggyJonesWangOigui.FatiguecrackgrowthandfracturepathsinsandcastB319andA356aluminumal-loysJ.MaterialsScienceandEngineeringA200334118-34.712007323铸造A356铝合金的微观组织及其拉伸性能研究作者：冉广，周敬恩，王永芳，席生岐，RANGuang，ZHOUJing-en，WANGYong-fang，XISheng-qi作者单位：西安交通大学,材料科学与工程学院,金属材料强度国家重点实验室,陕西,西安,710049刊名：金属热处理英文刊名：HEATTREATMENTOFMETALS年，卷(期)：2007,32(3)被引用次数：14次参考文献(22条)1.ZhaoHongApplicationofaluminumfortheautomoti