AZ80鎂合金超高壓靜液擠壓成形工藝及性能研究.pdf

1、聲明本學(xué)位論文是我在導(dǎo)師的指導(dǎo)下取得的研究成果，盡我所知，在本學(xué)位論文中，除了加以標注和致謝的部分外，不包含其他人已經(jīng)發(fā)表或公布過的研究成果，也不包含我為獲得任何教育機構(gòu)的學(xué)位或?qū)W歷而使用過的材料。與我一同工作的同事對本學(xué)位論文做出的貢獻均已在論文中作了明確的說明。研究生簽名：墮墊選沙f7年弓月7日學(xué)位論文使用授權(quán)聲明南京理工大學(xué)有權(quán)保存本學(xué)位論文的電子和紙質(zhì)文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部內(nèi)容，可以向有關(guān)部門或機構(gòu)送交并

2、授權(quán)其保存、借閱或上網(wǎng)公布本學(xué)位論文的部分或全部內(nèi)容。對于保密論文，按保密的有關(guān)規(guī)定和程序處理。Abs仃aCt碩士學(xué)位論文AbstractInthispaper，theformingprocessofultrahighpressurehydrostaticextrusionofAZ80magnesiumalloywasresearchedFirstofall，theoverallschemeofultrahighpressurehydr

3、ostaticextrusionsystemwasmade，theformingprocessofitwasdetermined，andthetheoreticalstudyoncriticalprocessparametersandtheprincipleofhydrostaticextrusionwereconductedindepthMeanwhile，theformingprocessschemesoflargediameter

4、magnesiumalloytubesandthickwallmagnesiumalloytubeswereestablishedwithrelateddiedesignedThen，theprocessofultrahighpressurehydrostaticextrusionwassimulatedbyusingDEFORM3DfiniteelementsoftwareThedistributionlawofthetemperat

5、urefieldoftheex臼1lsioncontainerwasobtained，whichisinstructivetostudyonthehydrostaticextrusiontemperatureTheformingprocessoflargediametermagnesiumalloytube’ShydrostaticextrusionwassimulatedandanalyzedTheeffectofextrusionr

6、atioontheextrusionload，eauivalentstrainandvelocityfieldwasstudiedWiththeincreaseofextrusionratio，thepeakDressureandaveragepressureoftheextrusionloadincreasedTheeffectofextrusionratioonthepeakpressurewasgreaterThedistribu

7、tionofformedtube’SequivalentstrainwasanalyzedThemaximumvalueoftheequivalentstrainwasdistributedintheextrusiondeformationzone，wheresevereplasticdeformationmainlyincludingshearingandextrusiondeformationoccurredFinallythela

8、rgediameterandthickAZ80magnesiumalloytubewerefabricatedinthe40MNhorizontalhydrostaticextrusionmachineSamplesfromthesetubes，wereanalyzedforthemicrostructureandtestedforthemechanicalpropertiesTheresultsshowedthattheultimat

9、etensilestrengthandtheyieldstrengthofhydrostaticextrusionproductswereimprovedgreatly，buttheductilityofitwasatlowlevelAfterhydrostaticextrusion，themicrostrucmreofmagnesiumalloytubewasanalyzedThegrainswereelongatedalongthe

10、extrusiondirection，thesubgrainappearedandthegrainrefinementwasobviousTheeffectofrecrystallizationannealingprocessonpropertyofhydrostaticextrusionproductswasstudied，whichisimportanttoimprovetheplasticpropertyofproductsKey