Ni基合金反应钎焊接头的微观组织及剪切强度（英文）.pdf

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1、Availableonlineat、^^^n^f．sciencedirect．com一4p,，Transactionsof啭擘：ScienceDirectNonferrousMetalsSocietyofChinaPressTrans．NonferrousMet．Soc．China22(2012)324—329WWW．mmSC．cnMicrostructureandshearstrengthofreactivebrazingjointsofTiA1／Ni-basedalloyLIHai—xin，HEPeng，LINTie．song，PA

2、NFeng，FENGJi．cai，HUANGYu—dong21．StateKeyLaboratoryofAdvancedWeldingandJoining，Ha~inInstituteofTechnology,Harbin150001，China；2．SchoolofChemicalEngineeringandTechnology,Ha~inInstituteofTechnology,Harbin150001，ChinaReceived9March2011；accepted11May2011Abstract：Reactivebrazin

3、gofTiAl—basedintermetallicsandNi．basedalloywimTifoilasinterlayerwasinvestigated．Theinterfacialmicrostructureandshearstrengthoftheiointswerestudied．Accordingtotheexperimentalobservations，themolteninterlayerreactsvigorouslywithbasemetals，formingseveralcontinuousreactionlay

4、ers．ThetypicalinterfacialmicrostructureofthejointcanbeexpressedasGH99／(Ni，Cr)。0,)／TiNi()+TiNi2A1(r4)+Ti2Ni(6)／8+Ti3A1(a2)+A13NiTi2(r3)／a2+r3／TiA1．Themaximumshearstrengthis258MPaforthespecimenbrazedat1000。Cfor10min．Higherbrazingtemperatureorlongerbrazingtimecausescoarseni

5、ngofthephasesinthebrazingseamandformationofbrittleintermetalliclayer,whichgreatlydepressestheshearstrengthofthejoints．Keywords：TiA1：Ni．basedalloy；reactivebrazing；interfacialmicrostructure；shearstrengthmaylimitthismethodtopracticalapplications[10]．1Intr0ductiOnVacuumbrazi

6、ngisconsideredtobeagoodchoicetosolvetheseproblems『8，10]．However,afewstudiesTiA1．basedalloysareregardedasexcellenthavebeenreportedonbrazingTiAl—basedintermetallicsmaterialsforhightemperatureapplications，becauseoftoNi—basedalloys．TETSUIf1l1usedsilverbrazingtotheirlowdensit

7、y,highmeltingtemperatureandhilghioinTiAlandNi—basedalloy．However,thejointobtainedtemperaturestrength[1，2]．Studiesofthepracticalbythismethodcannotsarisfyhigh．temperatureapplicationofTiAlf0rcomponentsinaircraftandapplications(above500。C、．BecauseTiA1．basedautomobilehavebeen

8、carriedout『2，31．InordertointermetallicsandNi．basedalloysareoftenusedinfurtherextendtheirscopesofapplica