znal合金管的连续挤压与组织与性能研究

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1、万方数据StudyonMicrostructuresandPropertiesofZn·AlAUoyTubesbyContinuousExtrusionAbstract：ThepresentreseaLrchissupponedbyHunallProVinceScienceandTecllllologyP1anProject(2012Gk4012)fortllethemeofreplacingc叩perwimzinc．AprocedureincludingtWo—st印continuousexmJsionforZn—Alalloytube

2、sisobtained妇oughCONFOI之Mcontinuousextmsionprocessexperiments．MoreoVer，theweldingmechanismduringcontinuousextl。usion，theagingbehaViorinseⅣiceconditions，andt11eeffectofstabilizingheattreatment((350oC，30min，如mace—cooling)+(1000C，l2h，anc001ing))wereanalyzedaJldinVestigated．Am

3、ethodoftwo—stepcontinuousextn】sionisproposedforthefirSttime，andZn—Alalloytubesoftwosizes((p12．5×1mmand(P15．5×1．5mm)aresuccess如1lypreparedthroughstI-engmenedwelding．TheresultsindicatethatZn-Alalloytubesbycontinuousextmsionexhibithighyieldrate(>90％)，goodweldingqualit)rwitht

4、heweldseamwidthof2．48¨mandsuperiormechanicalproperties(6庄320Ⅳ咿a，6>l9．5％)．ThetensilestrengthofextmdedtubesismorethanthatofsinlplebraussinsoRstate．TheextmdedZn—Ala110ytubesaremainlymadeupofT1phase，0【phaseandnon—equilibriumpphaseinmicros仃uctures．Afterstabilizingheatt1．eatmen

5、t，theamountof0【phasedecreases，whilethecontemofO【+T11amellarsmlctureincreases．ItisbenefittoimproVetheperfomancestabili锣o：E．Zn-Alalloytubes．Basedoncre印tests，itispointedoutthecreepmechanismsofexperimentala110ysaredislocationglidemech砌smandgrainboullda叫slidingmechanismunderte

6、nsileconditionsatroomtemperature．Besides，theheat-treatedZn-Alalloytubesshowbettercre印resistancetllallt11eas—extrudedalloytubes，andthedenectionunderthebendingstressof20Ⅳ中afor48hisreducedby40％aRerstabiljzingheattreatment．AccordiIlgtot11eanalysisofweldseams，durings01id—state

7、weldingofcontinuousextrudedZn—Alalloytubes，Al-richaphaSegathersinweldseamsowingtothedifferentdi伍Jsioncoef![icientofelementZnandA1．Stabilizingheattreatmentc锄promotethedif如sionandll万方数据reo唱anizationofelementsbominweldseamandm撕x，soastoreachtheequilibriumstateinmicrostmcture，

8、、Ⅳhichcallweakenmeharmfule腩ctsofweldseams．Themiddlepanof砒esdon’tcrackalongtheweldse锄sinn撕ngtests