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《》20103918Material&HeatTreatmentA356Al-Si-Mg,ZL101A。Si、Mg、TiFe,,。A356、、,,、、,。、、,[1]。A356,。,、,A356[2]。Al-Sr,。,Sr[3]。,Al-10SrA356T6Al-SrA3561,2,1,2,1,2,3(1.,400045;2.,400045;3.,644000):A356Al-10Sr,T6A356,。:A356β(Al5FeSi);T6,Si,Mg2Si,;A356,;T6A356,;+。:A356;Al-10Sr;;:TG166.3:A:1001-3814(2010)18-0155-03InfluencesofT6HeatTreatmentonMicrostructureandMechanicalPropertiesofA356AlloyModifiedbyAl-SrMasterAlloySUNShouzhuang1,2,PENGXiaodong1,2,XIEWeidong1,2,MAOYu3(1.NationalEngineeringResearchCenterforMagnesiumAlloys,ChongqingUniversity,Chongqing400045,China;2.CollegeofMaterialsScienceandEngineering,ChongqingUniversity,Chongqing400045,China;3.YibinVocationalandTechnicalCollege,Yinbin644000,China)Abstract:A356AlalloymodifiedbyAl-10Srmasteralloywasdie-casted.ThetensilepropertiesofthealloybeforeandafterT6heattreatmentweretested,andthefracturemorphologywasobserved.ThenthefracturemechanismwasdeterminedbyOMandSEM.Theresultsshowthattheiron-basedparticleinA356alloyismainlyβphase(Al5FeSi),thecorneaofSieutecticparticleismoreroundafterT6heattreatment,andtheparticleofMg2SicompletelysolublesinAlmatrix,themicrostructureisimproved;alargeamountofdimplesappearinthetensilefractureofbothas-castandheat-treatedA356alloy,whichrevealsagoodductility.ButtherearemoreuniformdimplesdistributioninthetensilefractureofT6-treatedA356alloythanthoseofas-castalloy.Thetensilefracturemorphologyofas-castA356Alalloyisoccupiedbydimples,showingagoodductility.Andthetensilefracturemechanismisdimplefractureandcleavagefracture.Keywords:A356Alalloy;Al-10Sr;microstructure;mechanicalproperties:2010-03-17:(CSTC,2008AA4029);(2007CB613702):(1982-),,,,、;:13627606374;E-mail:sunshouzhuang@163.com15520109HotWorkingTechnology2010,Vol.39,No.18Material&HeatTreatment1A356Fig.1ThemicrostructureofA356alloyatdifferentstate100μm50μm25μm100μm50μm25μm(a)(b)(c)(a)(b)(c)T6,A356,。1A356,Al-10Sr,700℃,680℃30min。A356(,%):6.5Si,0.33Mg,0.07Fe,0.13Ti,0.005Sr,<0.01,Al。T6(535℃5h,60℃+1h+165℃4h)。T6A356,,0.5μm。0.5wt%HF,10s。。TESCANVEGA2,、。,,SEM,,。22.11T6A356。,,,,α(Al),,。A356:α-Al、Si、Mg2Si、,FeFe,,β(Al5FeSi),π(Al9FeMg3Si5)[4]。,,,。T6,,[5],,T6,α-Al[6]。200,Si,,[7],,。Mg2Si,Mg2Si,,。Mg2Si,[8],。156《》20103918Material&HeatTreatment200μm25μm200μm25μm3A356Fig.3TheSEMphotographsofA356alloyatdifferentstateT6。2T6A356SEMEDS。,Fe。2.2,A356232MPa,15.06%,T6246.5MPa,18.63%。T6。,,。Al-10SrA356,19.96%,12.82%;248MPa,230MPa。2.3,TESCANVEGA2。3T6A356。,,,,。。,,,[9]。T6A356,,,,,,[10]。3(1),Al-10SrA356T6,,β(Al5FeSi),π(Al9FeMg3Si5)。(2)T6,A356,。(3):A356+。:[1],.[J].,2000,(6):32-34.(162)35μm35μm1122CPS→CPS→0246810121416182002468101214161820E/keVE/keVFeFeMnAlSiFeAlSiFe2A356SEMEDSFig.2TheSEMimagesandEDSpatternsofA356alloyatdifferentstate(a)(b)T615720109HotWorkingTechnology2010,Vol.39,No.18Material&HeatTreatment(157)[2],,,.[J].,2008,36(7):10-13.[3],,,.Al-Sb-MgA356[J].,2009,38(1):26-29.[4].[J].-,2003,39(4):180.[5].A356.2Si[J].,2008,28(4):319-320.[6],,,.T6[J].,2006,35(6):30-32.[7],,.SrA356[J].,2004,53(8):599-601.[8]MaZY,MishraRS,MahoneyMW.SuperplasticityincastA356inducedviafrictionstirprocessing[J].ScriptaMaterialia,2004,50:931-935.[9],,.A356[J].,2006,35(10):1620-1624.[10],,,.A356[J].,2007,17(2):24-27.M。4(1)350~500℃Ti-50.8Ni/A→R→M/M→R→A,550℃A→R→M/M→A,600~800℃A→M/M→A。Tan,TR,TM,ΔTM,ΔTR(4℃)。(2),400℃M→R→A/A→R→M,500℃A→R→M/M→R→AA→R→M/M→A。,TR400TR500,TM500TM400,ΔTM400ΔTM500,tan,TR,TM,ΔTM,ΔTR。(3)600~700℃350~550℃,650℃400℃5。800℃,。(4)12℃,600℃SE,600℃SME。tan,-。Ti-50.8NiSMASE,600℃。:[1]ZurbituJ,CastilloG,UrrutibeascoaI,etal.Effectofimpact-inducedstrainonthestress-inducedmartensitictransformationofsuperelasticNiTishape-memoryalloywires[J].J.Mater.Eng.Perfor.,2009,18:600-602.[2],,,.[J].,2008,37(5):111-115.[3]OtsukaK,RenX.Recentdevelopmentsintheresearchofshapememoryalloys[J].Intermetallics,1999,7:511-528.[4],,.TiNi[J].,2007,36(4):43-45.[5],,.NiTi-Ni[J].,2006,31(9):17-21.[6].Ti-Ni[J].,2007,43(4):163-167.[7],,.TiNiNi[J].,2003,39(6):617-622.[8]HuangX,LiuY.EffectofannealingonthetransfromationbehaviorandsuperelasticityofNiTishapememoryalloy[J].ScriptaMater,2001,45(2):153-160.[9]ChrobkD,StrozD.Two-stageRphasetransformationincold-rolledandannealedTi-50.6atpercentNialloy[J].ScriptaMater,2005,24(8):40-41.[10],,,.TiNi[J].,2007,36(6):998-1001.[11],,,.NiTi[J].,2008,23(2):8-13.[12],,.Ti49.4Ni50.6[J].,2004,40(1):46-50.[13].Ti-50.2Ni[J].,2007,17(2):233-238.[14],,,.R[J].(),2004,41(5):998-1002.[15]LiuWei,ZhaoXinqing.Mechanicalpropertiesandtransfor-mationbehaviorofNiTiNbshapememoryalloys[J].ChineseJournalofAeronautics,2009,22(5):240-243.162
本文标题:T6处理对Al_Sr中间合金变质的A356铝合金组织与性能的影响
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