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1、Ti-BcompositepowderSciencePressAvailableonlineatwww.sciencedirect.com亭c…cE@.…cTrans.NonferrousMet.Soc.China17(2007)919—924TransaetionsofNonferrousMetalsSocietyofChinaⅥnVw.CSU.edu.cn/ysxb/Synthesisandgraingrowthkineticsofin—situFeA1matrixnanocomposites(I):MechanicalalloyingofFe--A1--Ti--Bcompositep
2、owderRENRong(任榕),WUYu?cheng(吴玉程),TANGWen?ming(汤文明),WANGFeng.tao(汪峰涛),WANGTu.gen(t涂根),ZHENGZhi?xiang(~祥)SchoolofMaterialsScienceandEngineering,HefeiUniversityofTechnology,Hefei230009,ChinaReceived16April2007;accepted16July2007Abstract:Threenanocrystallinealloys,Fe50Al50,Fe42.5AI425Ti5B10andFe35A135
3、Ti10B20(molarfraction,%),weresynthesizedfromelementalpowdersbyhigh.energyballmilling.ThestructuralevolutionsandmorphologicalchangesofthemilledpowderswerecharacterizedbyX.raydiffractometry(XRD),transmissionelectronmicroscopy(TEM)andscanningelectronmicroscopy(SEM).TheeffectsofdifferentTi.Badditionso
4、nthestructureandphasetransformationinthesealloyswerealsodiscussed.ItisobservedthatthediflusionofAl,Ti.BatomsintoFelatticeoccursduringmilling,leadingtotheformationofaBCCphaseidentifiedasFe(AI)orFe(A1.Ti,B)supersaturatedsolidsolution.Fe—basedsolidsolutionwithnanocrystallinestructureisobservedtobepre
5、sentastheonlyphaseinallthealloycompositionsaftermilling.Furthermore,thecontentsofTi,Baffecttheformationofmechanicalalloyingproducts,changesinthelatticeparameteraswellasthegrainsize.Keywords:FeAI;composite;mechanicalalloying;structuralevolution;nanocrystalline1IntrOductiOnIronaluminidesareofcOnside
6、rableinterestduetotheirexcellentoxidationandsulphidationresistanceespeciallyatelevatedtemperatures,incombinationwiththeirrelativelylowdensityandcost.However.concurrentdrawbackssuchaslowductilityatroomtemperatureandlowmechanicalstrengthabove600℃limittheiruseforstmcmralapplications.Sincerefiningofgr
7、ainsizetonanocrystallinestatehasbeensuggestedasawayofimprovingtheductilityofintermetalliccompounds,aconsiderableamountofworkhasthereforebeenconcentratedonthesynthesisofnanocrystallineintermetalliccompounds,andinp
