半固态6063铝合金再结晶组织演变的.研究

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1、东北大学硕士学位论文StudyonMicrostructuralEvolutionofSemi-·Solid6063AluminumAlloyinRecrystallizationAbstractSemisolidmetalprocesshasbeenpaidmuchattentionbecauseofitsfinecharacteristicssuchashighefficiency,hi曲performance，lowcost，energyconservationandenvironmentalprotectionetc．11

2、1eSSMhadalargeimprovementontheoryresearchandindustrialapplicationinthepast40years．Inordertoachieveperfectsemisolidbilletmicrostructure，peoplehaveinventedmanytechniquestomakesemisolidbilletintherecentlyyears，however，asaresultofsolidificationlatentheatincastingprocess，p

3、eoplecouldnotachieveunifo吼i锣fineandspheroidalbilletmicrostructureasexpectation．MicrostructureandcapabilityofbilletwouldbeenhancedhighlybecauseofitsfmegrainsafterThermomechanicaltrealmentanditwouldreducethetechnicsdemandofmakesemisolidslurry．IntheaidoftheNationalNatura

4、lScienceFoundationofChina,thispaperchoosedsemisolid6063alloyasexperimentalmaterial，studiedtheruleofthealloymicrostructureevolutioninrecrystallizationafterThermomechanicaltreatment．ThemainresultsachieyedareaSfollows：Themicrostructurecoldrolledto30％、40％、50％、60％、65％ofall

5、oyWasstudied,opticalmicrographsshowedthegrainsofbilletwerestavedaftercoldrolling，withthelagerdeformationdegree，thegrainsmicrostructurewouldbestavedmoreserious．Whencolddeformationdegreereached50％，thegrainsmicrostructureaftercoldrollingwouldlikeflakesandsomegrainsseemed

6、likecrackedrosebush，thesecrackedrosebushgrainsgottogtherlikeastrip，anditsareawouldbeincreased诵t11thelargerdeformationdegree．nemicrostructureannealedat520。Cand615"Cfordifferenttimeofalloyaftercoldrollingwithreduction65％wasstudied．opticalmicrographsshowedthegrainssizewo

7、uldbelargerwiththelongerannealingtimewhenalloysampleswereannealedat520℃for5minutesto35minutes．Mlilethegrainssizewouldbesmallerwiththeshoterannealingtimewhenannealedat615℃forlminuteto5minutes．1f1圮microstructureannealedat520"Cto625。Cfor5minutesofalloyaftercoldrollingV东北

8、大学硕士学位论文、衍tIlreduction65％wasstudied．opticalmicrographsshowedthegrainssizewouldbelargerwiththehigherannealingtemperature．Thes