电磁搅拌对7075铝合金微观组织及力学性能的影响

:2008201228;:2008204224:(No.2006CB605203),(No.2006AA03Z115)(No.2006DFA52110):(19822),,.:.Email:[e-mail].29No.7Jul20087075,,,(,,100088):7075,7075,,,62%,53%;,438MPa,5.5%,:7075;;;;:TG146.2+1;TG113:A:100028365(2008)0720896204EffectofElectromagneticStirringonMicrostructureandMechanicalPropertiesof7075AluminumAlloyTANGXiang2shan,XUJun,ZHANGZhi2feng,TIANZhan2feng(GeneralResearchInstituteforNonferrousMetals,Beijing100088,China)Abstract:Theeffectofelectromagneticstirringonthemicrostructureandmechanicalpropertiesof7075aluminumalloyproducedbycontinuouscastingwasinvestigated,andthepreparationfeasibilityofthesemi2solid7075aluminumalloybycontinuouscastingcombinedwithelectromagneticstirringwasalsocarriedoutbycontrastingwithtraditionalcontinuouscasting.Theresultsshowthatelectromagneticstirringcanimprovethemicrostructure,andincreasestheelongationsignificantly.Theelongationisimprovedby62%intheas2caststateand53%afterT6heattreatment.AfterT6heattreatment,thetensilestrengthandelongationofas2castspecimensare438MPaand5.5%,respectively.Moreover,theuniformsemi2solidstructurecanbeobtainedbysecondarymediumfrequencyinductionheating.Keywords:7075aluminumalloy;Electromagneticstirring;SSMfeedstock;Microstructure;Mechanicalproperty(SSM)2070,,,[1],[26],,,7(Al2Zn2Mg2Cu),,,,,,7075[7],,,,,,,7075,,25%50%,[2,3]7075(SIMA)[8,9],,,,,,150mm[10],[11],200mm,69807/2008:7075,,,[12],7075,7075,17075,w(%):Al25.14Zn22.42Mg21.50Cu478.3,639.3,,,7655min,1,112mm,,T6,465/1h,120/24h,1Fig.1SchematicofMHDsystem,«70mm20mm,500Hz,615,ZEISS200MAT1Tab.1ParametersofMHDsystem«70mm35/s140150mm/min35A18Hz22.170752,,2Al,,S(A12CuMg)T(A16CuMg42Al2Mg3Zn3)[9]A1,,A1[13],,,,,,,,,,,,;,2Fig.2Effectofelectromagneticstirringonmicrostructureofcontinuouscasting7075aluminumalloy798FOUNDRYTECHNOLOGYVol.29No.7Jul200833ab,,,50m,,,7075,,(25%50%),[14]2.247075T6,T6,,,7075,TS,,,,,,3b,,,37075Fig.3Microstructureof7075aluminumalloyaftersecondaryinductionheating4Fig.4Microstructureof7075aluminumalloyafterT6heattreatment2.370755,,,3%,,6%,,438MPa,53%,,89807/2008:707557075Fig.5Mechanicalpropertiesof7075aluminumalloypreparedbydifferentprocessingtechniques3(1)7075,3.7%6%,T6,3.6%5.5%;T6,,438MPa(2)7075,50m[1]ZFan.Semisolidmetalprocessing[J].InternationalMaterialReviews,2002,47(2):1237.[2]H2HJo,Y2OYooh,J2KLee.EffectofPartialRemeltingProcedureontheMicrostructureEvolutionof7075AlwroughtAlloyforThixoextrution[J].SolidStatePhenomena,2006,1162117:3362339.[3]SChayong,PKapranos,HVAtkinson.Semi2solidprocessingofaluminum7075[A].GLChiarmettaandMRosso.Proceedings.of6thInternational.Conference.onSemi2SolidProcessingofAlloysandComposites[C].Turin,Italy:EdimetSpa2ViaCorfu102,2000:6492654.[4]GLu,JCui,JDong.Continuouscastingofaluminumalloy7075forsemi2solidforming[A].GLChiarmetta,MRosso.Proceedings.of6thInternational.Conference.onSemi2SolidProcessingofAlloysandComposites[C].Turin,Italy:EdimetSpa2ViaCorfu102,2000:3732377.[5]SLuo,JJiang,DTeng.Researchonsemi2solidformingforLC4alloy[A].YTsutsui,MKiuchi,KIchiakawa.Proceedings.of7thInternational.Conference.onSemi2SolidProcessingofAlloysandComposites[C].Tsukuba,Japan:AIST,IAI,2002:2272232.[6]JDong,JZCui,QCLe,etal.Liquidssemi2continuouscasting,reheatingandthixoformingofawroughtaluminumalloy7075[J].MaterialsScienceandEngineering(A),2003,345:2342242.[7]ASM.MetalsHandbook,Desked.[M].MetalsPark:Ohio,1984.[8]ChayongS,AtkinsonHV,KapranosP.Thixoforming7075aluminiumalloys[J].MaterSciEng.A2StructMaterPropMicrostructProcess,2005,390:3210.[9]GVaneetveld,ARassili,JLecomte.Thixoforgingof7075aluminumalloysathighsolidfraction[J].SolidStatePhenomena,2006,1162117:7622765.[10],,,.AlSi7Mg[J].,2006,35(9):46249.[11]ZFZhang,JXu,ZFTian,etal.Thecontinuouscastingofasemisolidaluminumalloybilletwithamultiplemagneticfieldimposed[J].JournalofCeramicProcessingofKorea,2006,7(2):124.[12]KZhang,JXu,LKShi,etal.ResearchandapplicationsofSSPinChina[A].GLChiarmettaandMRosso.Proc.of6thInt.Conf.onSemi2SolidProcessingofAlloysandComposites[C].Turin,Italy:EdimetSpa2ViaCorfu102,2000:1152120.[13],[M].:,1975.[14]ETzimas,AZavaliangos.Evaluationofvolumefractionofsolidinalloysformedbysemisolidprocessing[J].JournalofMaterialsScience,2000,35(21):531925329.200816:1.;2.;3.;4.;5.;6.32255222,20.0026.00/:60235:310012::0571-88062120:::33001616735053011237998