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时间:2020-04-30
《Ni基合金反应钎焊接头的微观组织及剪切强度(英文).pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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