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14220074MetallicFunctionalMaterialsVol114,No12April,2007A3561,2,1,2,1,2,1(1.,200092;2.,200092):A356,2Al,;,,:A356;;:TG146.21:A:1005-8192(2007)02-0024-04AnalysisofTheMicrostructureandTensileFractographsofA356AlloyFANSong2jie1,2,HEGuo2qiu1,2,LIUXiao2shan1,2,XUPo1(1.SchoolofMaterialsScienceandEngineering,TongjiUniversity,Shanghai200092,China;2.ShanghaiKeyLabforR&DandApplicationofMetallicFunctionalMaterial,Shanghai200092,China)ABSTRACT:TheeutecticsiliconphaseFe2richparticlesandshrinkagedefectdistributedintheprimary2AlphasewereobservedbytestmethodssuchastheopticalmetallographicmicroscopeandFE2SEM.Thecharacteristicofmi2crostructurehasbeenanalysed.ThetensilefracturesurfacewasalsoobservedbySEM.Thefracturesurfaceshowsthemixed2rupturecharacteristicsofquasi2cleavageanddimple.Thefractureprocessandmechanismwasinvestiga2ted.KEYWORDS:A356alloy;microstructure;tensilefracturesurface:(50371063);(RP-07-159);(NCET-05-0388):(1982-),,,E2Mail:0520060005@smail.tongji.edu.cn,:(0)135649165071A35670,22,,,[1,2],A356,[3]A356,,[4],A356,2A356(250mm,160mm,51mm),1T6,,5385h,1384h1A356/%()Tab.1ChemicalcompositionofA356alloySiMgFeTiSr(Cr,Cu,Mn,Ni,Sn,Zn)Al6.60.360.090.190.0050.01,,,0.5%()HF,8s,(2446),50,100;,(SEI)(BEI),,,;,5mm,,,,SEM,,3.3.1(1),2Al,2Al,,T6[5],2Al,,,222/%()Tab.2Theresultofchemicalelementsanalysisofmicroregion/wt%AlSiMgFe12.3087.700025.4874.52001.7269.4813.0015.801A356Fig.1ThemetallographsofA356alloys,,,MgFe,Mg2Si2(a),100m,,(),,2(c),,,,,,,,522:A3562Al,(Al),,2Al2(b),,,,,Sr2(d),,,,,,,,,,2Fig.2ThephotographsofFE2SEM3.23,3(a,c),,,,,,[6],,,,[7],3,3(b),,3(d),,,622007,,,,,[8],,,(),,,,[9]3(SEM)Fig.3Themorphologyoftensilefracturesurface41.2Al,,,,A3562.,A356,:1EjioforJU,ReddyRG.EffectsofporouscarbononsinteredAl2Si2Mgmatrixcomposites[J].JournalofMaterialsEngineer2ingandPerformance,1997,6(6),785.[2]AtxagaG,PelayoA,IrisarriAM.EffectofmicrostructureonfatiguebehaviourofcastAl27Si2Mgalloy[J].MaterSciTech2001,17:446.[3].[J].2,2003,39(4):180.[4]G,D1[M].:.1990.[5],,.Zl101A[J].,2004,10:39.[6],,,.A12Mg2Si[J].,1996,5:35.[7]RanGuang,ZhouJingen,WangQG.Theeffectofhotisostaticpressingonthemicrostructureandtensilepropertiesofanun2modifiedA3562T6castaluminumalloy[J].JournalofAlloysandCompounds,2006,421:80.[8]WangQG,CaceresCH,GriffithsJR.Damagebyeutecticpar2ticlecrackinginaluminumcastingalloysA356/357[J].MetMaterTransA,2003,34(12):2901[9].[M].:.1979,7:2006-09-30722:A356