资源描述：
《sic／ti6a14v复合材料界面反应扩散系数和微观扩散机理》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
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(Stat
2、eKeyLabofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072,China)Abstract:ThediffusioncoefficientsoftherelativereactiveelementsininterfacialreactionlayerofSiC/Ti6A14VcompositeweresolvedbyuseofGuassmethodinasemi—infinitediffusioncoup
3、leforternarysystems,andtheconcentrationdistributionofdiffusionelementscalculatedwaswellfittedtothemeasurements.Catomsdiffusethroughthereactionlayerbyinterstitialdiffusionmechanism,whileSiatomsdiffusethroughthereactionlayerbyvacancydiffusionmechanism.CandS
4、iatomshavetheminimumintrinsicdiffusioncoefficientsinTiClayer,whichare8.9403×10..and4.7747×10.m2.s～,respectively,becauseofthelowestmolecularvibrancyenergyandtransitiondistanceforCatomsandtheinsufficientvacancyforSiatoms.Thereactiveelementdiffusingthroughth
5、eTiClayerisadominantdeterminingstepininterracialreactionprogressofSiC/Ti6A14Vcomposite.Keywords:Ti—matrixcomposites;SiCfiber;interfacialreaction;diflusioncoefficients;micro—mechanismcLCnumber:TG146.23Documentcode:AArticleID:1002—185X(2007)06—08—0941Theint
6、erfacialreactioninSiCcontinuousfiberreinforeedtitaniummatrixcomposites(TMCs)isinevitableandtheinterfacialphasescanforlTlbetweenSiCfiberandthematrix.Theseinterfacialphasesmaycomeintobeingandgrowduringthefabricationofthecomposite.theheattreatmentandservices
7、ubsequently.Interfacialreactionbelongstoreactiondiffusionpro—blem.Whenitoccurs.CandSiatomsdiffIJsefromfibertothematrix,whileTiatomsandalloyingelementssuchasAl,VNbandsoondiffuseintheoppositedirection,soamulti—layerinterfacialreactionproductscomeintobeingbe
8、tweenfiberandmatrix.Duetoquiteafewofdiffusionelementsandtheinfluencedfactorsrelatingtothereactiondiffusion,aswellasthecomplicatedstructureofinterfacialreactionproducts.itisverydifficultinsolvingdiffusioncoef-ficient
