固相合成AZ91D镁合金制备工艺研究

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1、竺玺鎏垩三銮兰王主璧圭兰竺丝圣。STUDYoNPREPARATIONTECHNoLOGYOFAZ91DMAGNESIUMALLoYBYSoLID．STATERECYCLINGAbstractAstheprevalemapplicationofmagnesiumalloy,itbecomemoreandmoreimportantfortherecyclingofmagnesiumalloytorecyclescrapsappropriately,saveresource，reducecost，preventpollutionofenvironmentandprolongthel

2、ifetime．Themethodsofrecyclingmagnesiumalloyincludesolid-stateandliquid-staterecycling．Theliquid·staterecyclingmethodisappliedprevalentlynowadays，whichiscomplicatedandunsafesincemagnesiumalloyarereadilyoxidized．Thisproblemcanbesolvedbysolid-staterecycling．TheAZ91Dmagnesiumalloysamplesareprep

3、aredbyhotextrudingfrommachinedchips．Thismethodissafewithomprotectivecoveringandfusion,whichisbasedonplasticdeformationtheory,dynamicrecrystallizationanddynamicrecoverymechanism,dispersionstrengtheninganddiffusionweldingmechanism．Thestudydesignedasetofm∞ldwiththeextrusionratioof4：1、ll：l、25：1

4、、4．0：1、100：1，modularangleof60‘，6mmofworkingtape，and2‘ofroundingattheentranceofmould．Itcanmeetthepropertytestofmaterialspreparedbyhotextrusionfromrecycledmachinedchips，whichisaccordingtothedesignprincipleofextrusionmollld．TheAZ91Dmagnesiumalloywaspreparedbychangingchipsize，extrusiontemperatu

5、re，andextrusionratio．Themicrostmcturewasobserved；themechanicalpropertyWastested，andcomparedwithas-caatandthesamplespreparedbyhotextrusionfromcastingot．Theresultshowsthat：comparedwiththeas-eastAZ91Dmagnesiumalloy,thegrainisrefinedobviouslysincedynamicrecrystallizationhavetakenplaceintheproce

6、ssofhotextrusion；withextrusiontemperatureincreasing，thegrain-lI-竺至至垩三盔兰三主罂圭：竺兰耋becomescoarserin恤erangeof300℃—450℃．At400℃。themicrostructureisthemosthomogeneous，thetensilestrengthisthebiggestandreaches340．3MPa,andtheelongationis9．5％；withextrusionratioincreasing，thedeformationofmetalincreases，

7、thegrainsrefineandthetensilestrengthenincreases．Whentheextrusionratiois100：1，thestrengthreaches394．3MPa．whentheextrusionratioiSbelow25：1，withextrusionrationincreasing，theelongationincreases，whentheextrusionratioisabove25：1，、^，ithextrusionratioincreasing，