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1、Availableonlineatwww．sciencedirect．com一Transactionsof讎ScienceDirectNonferrousMetalsSocietyofChinaELSEVIERPressTrans．NonferrousMet．Soc．China23(2013)2454—2459www．tnmsc．cnEffectoftravellingmagneticfieldoninterfacemorphologyindirectionallysolidifiedSn-CdalloyLeiWANG,JunSHEN，Ling
2、—shuiWANG,Zhou-rongFENG,Heng—zhiFUStateKeyLaboratoryofSolidificationProcessing，NorthwestemPolytechnicalUniversity,Xi’an710072，ChinaReceived15August2012；accepted15October2012Abstract：ThediversityofinterfacemorphologiesisobservedfordirectionallysolidifiedSn-0．65％Cdalloyunderat
3、ravellingmagneticfield(TMF1inthe4mm—diametersample．UnderanupwardTMF，planarandcellularinterfacemorphologiestransformalternatelywithincreasingmagneticfluxdensity(B<10．3roT)．TheinterfacemorphologytransformsfromshallowcellulartodeepcellularmorphologyunderaweakdownwardTMFf=3．2mT)
4、．Whenthemagneticfluxdensityincreasesfurther,bothsidesoftheinterfacemorphologyappeartobeslitlyinconsistent，buttheyroughlytendtobeplanarunderastrongdownwardTMF(10．3mT)．TheinterfaceinstabilitymaybeattributedtotheflowdrivenbytheTMFMoreover,theshapeofinterfaceaJ)pearstobealmostfl
5、atunderanupwardTMF．butdeflectiveunderadownwardTMFKeywords：directionalsolidification；travellingmagneticfield；interfacemorphology；Sn—Cdalloyfromthecentertotherimofthesample『12]．Inother1lntroductionwords，theLorentzforceislargerinabiggerdiametersample，whichmayresultinastrongflow
6、．ForasmallerUsingtravellingmagneticfield(TMF)isandiametersampletheLorentzforceissmallerintheefficienttechniquetocontroltheflowofconductingconductivemelt，andthesizeoftheBuoyancyandfluidsandtheheat／masstransferinthecrystalgrowthLorentzforcemaybeofthesameorderofmagnitude，proces
7、s【1—7】．ATMFiscreatedbymeansofapplyingwhichmayleadtoacomplexflow．Thecomplexflowout．of-phasealtematingcurrenttoanumberofco．coils．mayhaveameaningfuleffectontheinterfaceAsaresult．a(chǎn)meridionaltravellingLorentzfieldismorphology．However,liRleresearchhasbeendoneinainducedwhenaconduct
8、ivemeltisappliedinside．Thesmallerdiametersample．Moreover，theinterfacedirect
