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1、SiC／Ti6A14V复合材料界面反应扩散系数和微观扩散机理第36卷2007笠第6期6月稀有金属材料与工程RAREMETAL～￡ATERLSANDENGINEER1NGVbl-36.No.6June2007InterfacialReactionDiffusionCoefficientsandMicro.DiffusionMechanisminSiC/Ti6AI4VCompositeLfiXianghong,YangYanqing,MaZhijun,LuoXian,HuangBin,ChenYan(StateKeyLabofSolidi
2、ficationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072,China)Abstract:ThediffusioncoefficientsoftherelativereactiveelementsininterfacialreactionlayerofSiC/Ti6A14VcompositeweresolvedbyuseofGuassmethodinasemi—infinitediffusioncoupleforternarysystems,andtheconc
3、entrationdistributionofdiffusionelementscalculatedwaswellfittedtothemeasurements.Catomsdiffusethroughthereactionlayerbyinterstitialdiffusionmechanism,whileSiatomsdiffusethroughthereactionlayerbyvacancydiffusionmechanism.CandSiatomshavetheminimumintrinsicdiffusioncoeffic
4、ientsinTiClayer,whichare8.9403×10..and4.7747×10.m2.s～,respectively,becauseofthelowestmolecularvibrancyenergyandtransitiondistanceforCatomsandtheinsufficientvacancyforSiatoms.ThereactiveelementdiffusingthroughtheTiClayerisadominantdeterminingstepininterracialreactionprog
5、ressofSiC/Ti6A14Vcomposite.Keywords:Ti—matrixcomposites;SiCfiber;interfacialreaction;diflusioncoefficients;micro—mechanismcLCnumber:TG146.23Documentcode:AArticleID:1002—185X(2007)06—08—0941TheinterfacialreactioninSiCcontinuousfiberreinforeedtitaniummatrixcomposites(TMCs
6、)isinevitableandtheinterfacialphasescanforlTlbetweenSiCfiberandthematrix.Theseinterfacialphasesmaycomeintobeingandgrowduringthefabricationofthecomposite.theheattreatmentandservicesubsequently.Interfacialreactionbelongstoreactiondiffusionpro—blem.Whenitoccurs.CandSiatoms
7、diffIJsefromfibertothematrix,whileTiatomsandalloyingelementssuchasAl,VNbandsoondiffuseintheoppositedirection,soamulti—layerinterfacialreactionproductscomeintobeingbetweenfiberandmatrix.Duetoquiteafewofdiffusionelementsandtheinfluencedfactorsrelatingtothereactiondiffusio
8、n,aswellasthecomplicatedstructureofinterfacialreactionproducts.itisverydifficultinsolvingdiffusioncoef-ficient
