AlMnFeSi合金退火过程中的微观组织及力学性能的演变.pdf

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1、TransactionsofNonferrousMetals受Av·ailabl：eo，nSlinecaitewwnwc．secieDnceidrierect．ctomSocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)1878—1883www．tnmsc．cnEvolutioninmicrostructureandmechanicalpropertiesduringback—annealingofA1MnFeSialloyWANGNin

2、g，JarlErikFLATOY，LIYan-jun2，KnutMARTHINSEN1．DepartmentofMaterialsScienceandEngineering，NorwegianUniversityofScienceandTechnology,NO-7491，Trondheim，Norway；2．SINTEFMaterialsandChemistry,NO-7465，Trondheim，NorwayReceived10November201l；accepted25June2012Ab

3、stract：AnA1一Mn—Fe—Simodelalloywassubjectedtotwohomogenizationtreatments，toachievematerialswithdiferentlevelsofMninsolidsolutionanddispersoiddensities，followedbycoldrollingandback—annealing．Characterizationofhomogenizationanddeformationstructureswithre

4、specttotheefectofdiferentmicrochemistriesandstrainsonthestructureswasperformed．Time—temperature—transformation(TTT)diagramwithrespecttoprecirIitationandrecrystallisationasabasisforanalysisofthedegreeofconcurrentprecipitationwasestablished．TheTTT-diagr

5、amshowsastrongefectofMnconcentrationinsolidsolutionanddispersoiddensityonthesofteningbehavionRecrystallizationwhichfinisheswithouttheefectofconcurrentprecipitationresultsinalleven，fineandequiaxedgrainstructure．Precipitationpriortoorduringrecrystalliza

6、tion(concurrent)doesretardthesofteningkineticsandleadstoacoarsegrainstructure．Howeve~theefectalsodependsonthedurationofrecrystallizationandamountofprecipitation．Recrystallizationproceedingoveralongtimecombinedwithalargeamountofconcurrentprecipitationh

7、asastrongefect，otherwisetheefectwillbelimited．Pre．existingfineanddensedispersoids(meansize0．1Ⅱl1beforeback-annealingdoalsoleadtoacoarsegrainstructureafterrecrystallizationnomatterwhetheradditionalconcurrentprecipitationoccurs．Keywords：homogenizationtr

8、eatment；dispersoidphase；solidsolution；back-annealing；recrystallization；concurrentprecipitation；TTT-diagramTheworkismotivatedbytheneedtoimprove1Introductionexistingphysicallybasedcomputermodelstoadequatelydescribethesofteningbehaviourinrecycleb