淬火速率对AA7108铝合金的微观结构和力学性能的影响.pdf

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1、TransacfionsofNonferrousMetals爱Av·ai．la一：ble，o，nSlinecaitewwnwc．secieDnceidrierecct．ctomSocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)1872—1877www．tnmsc．cnEfectofquenchingrateonmicrostructureandmechanicalpropertiesofcommercialAA7108aluminiumalloyIdaWEST

2、ERMANN，AnnLeniHAUGSTAD，YngveLANGSRUD，KnutMARTHINSEN1．S1NTEFMatedalsandChemistry,NO-7465，Trondheim，Norway；2．DepartmentofMaterialsScienceandEngineering，NorwegianUniversityofScienceandTechnology,NO一7491。Trondl1eim，Norway；3．BentelerAluminiumSystemsNorwayAS，NO一2830，Ra

3、ufoss，NorwayReceived10November2011：accepted25June2012Abstract：AcommercialAA7108aluminiumalloysubjectedtodifferentquenchingproceduresfromthesolidsolutiontemperatureof480。Cwasconsidered．Bothcontinuouslycoolingandquenchingtointermediatetemperatures(400，300and200。C)f

4、ollowedbydiferentholdingtimeswereapplied．Allthematerialsweresubsequentlysubjectedtothesameindustrialtwo-stepartificialageingproceduretoobtainamaximumstrength(T6)．TensiletestingofthediferentquenchedmaterialsintheT6temperrevealsalargedeviationinstrengthdependentont

5、hecooling／holdingtime，comparedwiththereferencesample．Acollectionofthedifferentquenchedmaterialswaschosenforfurtherinvestigationoftheprecipitatestructurebytransmissionelectronmicroscopy(TEM)toexplainthediferencesinmechanicalproperties．Keywords：aluminium；microstruc

6、ture；preci['itatefreezone；mechanicalpropertiesdiferentquenchedmaterialswasalsofurther1Introductioninvestigatedbytransmissionelectronmicroscopy(TEM)．Intheheat-treatablealuminiumalloys．theTheworkismotivatedbythefactthatduringmechanicalpropertiesarestronglydependent

7、ontheindustrialoperationunintendedstopsmaytakeplacemicrostructureobtainedduringthethermo—mechanicalwhichmayinterruptthequenchingaftersolutionheatprocess．Thestrengthismainlygainedfromthetreatmentandleavethematerialatacertainintermediateformationofnano．sizedprecipi

8、tatesdistributedinthetemperatureforashorterorlongertime，beforematrix．Toensul~thefinalstrengthofacomponent，itis，subsequentartificialageing．Itisimportanttoinvest