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[]1004-0609(2000)06-0819-0470752024,,(,410083)[]70752024,70752024707520%,660MPa606MPa,2024[];;;;[]TG249.9[]A,,[1,2],,0.1m[3],,[3,4],,[1,3,4],,,()[5,6],,,,[2,710],[5,11,12],,70752024,11.17075Al25.6Zn22.5Mg21.6Cu20.23Cr(,%),2024Al24.4Cu21.5Mg20.6Mn(,%)Cu,Mn,Cr7075700740,20247007400.2%0.4%(C2Cl6),1015min45mm1.2,7075,46224h,0.5/h470,2024,48512h,0.66/h495,106Vol.10No.6TheChineseJournalofNonferrousMetals200012Dec.2000[](G1999064900);[]2000-02-15;[]2000-07-24[](1962-),,,.1.3500t,400430,45mm,15mm,9,1.47075,:4662h;:4662h,4/h476,T6,12024h2024,:4932h;:4932h,6/h506,,T6,19112h1.5,Instron803222.170751(a),7075,S(CuMgAl2)T(AlZnMgCu)[6],,(1(b)),7075,,1(c)7075,,(475)[13]1(d),(Al),,1,,7075,,2.220242(a),,2024,S[6],S(Al)2(b),,17075Fig.1Microstructuresof7075alloys(a)As2cast;(b)Enhancedhomogenizationtreated;(c)GeneralsolutionandT6agetreated;(d)EnhancedsolutionandT6agetreated02820001222024Fig.2Microstructuresof2024alloys(a)As2cast;(b)Generalhomogenizationtreated;(c)Enhancedhomogenizationtreated;(d)GeneralsolutionandT6agetreated;(e)EnhancedsolutionandT6agetreated17075Table1Effectofenhancedsolutionheattreatmentonmechanicalpropertiesof7075alloySolutionheattreatmentb/MPa0.2/MPa/%Generalsolution60552313.6Enhancedsolution66960610.1Generalsolution(USstandard[14])57250311,(2(c)),,,,,2(d)2(e),7075,2024,2024,,222024Table2Effectofstrengtheningsolutiononmechanicalpropertiesof2024alloySolutionheattreatmentb/MPa0.2/MPa/%Generalsolution42233110.3Enhancedsolution43634710.137075,,,,2024,,,,20247075,,,[13],7075,,,7075,T[5,6],[6],2024,((Al)+)((Al)++S),,,,ST[5]128106,:7075202470752024,,7075,2024[REFERENCES][1]ImamuraT.Currentstatusandtrendofapplicablemate2rialtechnologyforaerospacestructure[J].JournalofJapanInstituteofLightMetals,1999,49(7):302-309.[2]LukasakDAandHartRM.Strongaluminumalloyshavesairframeweight[J].AdvancedMaterials&Pro2cesses,1991,10:46.[3]HahnGTandRosenfieldAR.Metallurgicalfactorsaf2fectingfracturetoughnessofaluminumalloys[J].MetallTransA,1975,6A:653.[4]NakaiMandEtohT.Effectofthemorphologyofcon2stituentsanddispersoidsonfracturetoughnessandfatiguecrackpropagationratein2024aluminumalloys[J].JournalofJapanInstituteofLightMetals,1995,45:677.[5]ZwickauECandFreibergUT.Possibilitiesforthecal2culationheattreatmentdiagramsforindustrialAlZnMg(Cu)alloys[J].Aluminium,1999,75:90-96.[6]MetallographicPhotosEditingGroup().MetallographicPhotosofPlasticDeformedAluminumAl2loys()[M].Beijing:MetallurgicalIndustryPress,1975.90-175.[7]ShihHC,HoNJandHuangJC.Precipitationbehav2iorsinAl2Cu2Mgand2024aluminumalloys[J].Metal2lurgicalandMaterialsTransactionsA,1996,27A:2479-2493.[8]SmithGW.Precipitationkineticsinsolutionizedalu2minumalloy2124:Determinationbyscanningandisothermalcalorimetry[J].ThermochimicaActa,1998,317:7-23.[9]ParkJKandArdellAJ.EffectofretrogressionandreagingtreatmentsonthemicrostructureofAl270752T651[J].MetallurgicalTransactionsA,1984,15A:1531-1543.[10]OhnishiT,HamamotoT,TsbakinoH,etal.StresscorrosioncrackingofRRA2treated7050aluminumalloy[J].JournalofJapanInstituteofLightMetals,1993,43:308-313.[11]ZENGSu2min().[J].TheChineseJournalofNonfer2rousMetals(),1999,9(1):79.[12]UchidaHandYoshidaH.Heattreatmentofaluminumalloys[J].SumitomoLightMetalTechnicalReports,1997,38:177.[13]HUDe2ling()andZHANGFan().PhaseDiagramsofTernaryAlloys()[M].Xian:NorthwesternPolytechnicalUniversityPress,1995.98-178.[14]WUGong(),YAOLiang2jun(),LIZhen2xia(),etal.HandbookofAluminumandAluminumAlloys()[M].Bei2jing:SciencePress,1994.256.Microstructureandmechanicalpropertiesofenhancedsolutiontreated7075and2024aluminumalloysCHENKang2hua,LIUYun2zhong,LIUHong2wei(StateKeyLaboratoryforPowderMetallurgy,CentralSouthUniversityofTechnology,Changsha410083,P.R.China)[Abstract]Theeffectsofenhancedsolutionofsecondphasesonthemicrostructureandmechanicalpropertiesofalloys7075and2024werestudied.Theresultsshowthatthetemperature2incrementalsolutiontreatmentcanmakethefinalsolutiontemperaturehigherthanthemulti2phaseeutectictemperaturewithouttheformationofoverheatedmicrostructure,andimprovethesecondphasesolution.Incontrasttoalloy2024,thesecondphasesinalloy7075candissolvemorecompletely.Themechanicalpropertiesofthesetwoalloysdependconsiderablyonthesecondphasesolution.Byincremental2solutiontreatment,theultimatetensilestrengthandyieldstrengthof7075alloyscanberaisedabout20%,to660MPaand606MParespectively.[Keywords]aluminumalloy;heattreatment;enhancedsolution;mechanicalproperties;secondphases()228200012