mgcu复合丝材的挤压拉拔工艺及性能研究

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1、国内图书分类号：TF124学校代码：10213国际图书分类号：621.7密级：公开工学硕士学位论文Mg/Cu复合丝材的挤压拉拔工艺及性能研究硕士研究生：KyaloMathewNdeto导师：刘祖岩教授申请学位：工学硕士学科、专业：材料加工工程所在单位：材料科学与工程学院答辩日期：2013年7月授予学位单位：哈尔滨工业大学ClassifiedIndex:TF124U.D.C:621.7DissertationfortheMasterDegreeinEngineeringRESEARCHONPROCESSINGANDPROPERTIESOFMg/CuCLADBIMETALWIRE

2、SOBTAINEDTHROUGHCO-EXTRUSIONANDDRAWINGCandidate:KyaloMathewNdetoSupervisor:Prof.Prof.LiuZuyanAcademicDegreeAppliedfor:MasterofEngineeringSpeciality:MaterialProcessingEngineeringAffiliation:SchoolofMaterialsScienceandEngineering.DateofDefence:July,2013Degree-Conferring-Institution:HarbinInst

3、ituteofTechnologyAbstractAbstractBimetallicwirescombinethepropertiesoftwodifferentmetalsintoahybridmaterialtoobtainimprovedperformancesuchascorrosionresistance,mechanicalstrength,andelectricalconductanceorenhanceweighttostrengthratio.Bycarefulmaterialselection,propertiesofbimetallicmaterial

4、scanbeoptimizedforparticularserviceconditions.However,difficultiesinmanufacturelimitthenumberofmaterialcombinationsinactualuse.Oneofthemainaspectsinproductionofcladwiresistoensureuniformityinsleevethickness.Co-extrusionisaprocessofconcurrentlyextrudingtwoormorematerialsfromasinglecompositeb

5、illet.Magnesiumexhibithighstrengthtoweightratio,goodthermalconductivity,highdimensionalstability,goodelectromagneticshieldingcharacteristics,highdampingproperties,goodmachinabilityanditiseasilyrecyclable.Magnesiumhasalsounattractivepropertieslikelowcorrosionandwearresistance,poorcreepresist

6、anceandhighchemicalreactivitythathavelimiteditswidespreaduseinmanyapplications.Copperontheotherhandpossessoutstandingresistancetocorrosion,exceptionalformability,andgoodstrengthandfatigueresistance.Coppercanbeusedinrelativelyhightemperatureapplications.Theabovementionedpropertiesofmagnesium

7、andcoppercanbeblendtogethertoobtainabimetalproducthavingsuperiorproperties.Inthisresearchaprocessingmethodcombiningextrusionanddrawingwascarriedouttoproducebi-metalwiresconsistingofamagnesiumcorecladbyacoppersleeve.Theinitialstepwasco-extrusioncarriedout