az91d镁合金表面激光改性的组织和性能分析word格式论文.docx

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az91d镁合金表面激光改性的组织和性能分析word格式论文.docx

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az91d镁合金表面激光改性的组织和性能分析word格式论文

j，Lo;t理工人学硕土研究生学位论x.RESEARCHONTHESTRUCTUREANDPERFORMANCE OFLASERMODIFIEDSURFACEOFAZ91DMAGNESIUMALLOYABSTRACT1nordertoachievethepurposetoe时lancethesurfacehardnessandanti-colTosionabilityofMagnesiumaJloy，thisthesisusesCO2laserwithamaximumlaserpowerof5kwtoconductthelasermeltingandcladdingprocessonthesurfaceofMagnesiumalloy.lntheproccssofexperience，theauthorrespectivelyanalyzcsthrcesurfacemodifiedcrafts，thatarethelaser me)ting process，laser cladding nano-AhOyWC/Co composilecoating and theAlpowder addedinthecoating，andcomparestheoriginalMagnesiumalloyandthesurfacemodified layer on themicrostructure，phasecomposition，microhardness，eJectrochemical corrosionandotherperformances.First，thelasermelting isconductedonAZ91Dmagnesium al1oy.IIIThemeltedlayer1ikesawanedmoon，andthegrainsofmeltedlayeraresmallerthanthoseofthematrix，onlyconsistedofα-MgandMg17AI12.Thereisnocrack，poreandotherdeficienciesinthemeltedlayer，whichcouldcombinewiththematrixwell.Underthecomprehensivefunctionoffine-grained intensificationandprecipitationintensification，boththe太原理L:大学硕十研究生学位论文microhardnessandanti-conosionabil1tyofthemeltedlayerareobviousJyimproved.Second，inconsiderationofthattheAh03，asahardceramicparticle，haspossessedaseriesofexcellentfeaturessuchashighhardness，highstabíJityandlowdcnsity，andAb03isthereinforcementinlasercJaddinglayer; WC grain has the characteristícs of high hardness and goodantí-corrosion abiJity，which isdecomposed intoWand Cthrough laseraction.TheWcarbides，precipitateduniformlyrandom，play anexcellentroleindispersionstrengtheningandsoJidsolutionstrengthening;Cocanintensifytheanti-conosionability，1nthisthesis，thenano-AhO/WC/Cocompound layerisadded onthesurfaceofAZ91Dmagnesium alloythroughlaser，butonJyalittJeCocouldbeaddedsinceitwillsurround thesurfaceofWCgrainsandobstaclethedecompositionofWCgrains. ThelasercladdinglayerformstinydendriteandcolumnarparticJes nearthematrix.ThegrainsizegraduallybecomessmallerandsmaJlerfromthe bottomtothesurfaceofthecladdinglayerwithoutobviouscrackso