镁合金组织和织构对其电磁屏蔽效能的影响

沈阳理工大学硕士学位论文镁合金组织和织构对其电磁屏蔽效能的影响姓名：姚路明申请学位级别：硕士专业：火炮、自动武器与弹药工程指导教师：曲家惠20090301AZ31SEMXAZ31Ф152mm2µm{01−10}{01−10}10−17{01−10}1.2613.48Ф152mm30MHz~1.5GHzФ70mm40min30040min35040min400{0110}{0661}{02−21}30MHz~1.5GHzAZ31-2dB~4dB13%25%45%57%65%65%95%{0001}{0001}110065%{0001}14.3765%AZ31AbstractInthispaper,theas-receivedAZ31Magnesiumalloywaspossessedandannealedindifferentconditions.Microstructuresandtexturesinthepresentsampleswereperformedbyopticalmicroscopy(OM),scanelectronmicroscopy(SEM),scanelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)andX-raydiffraction,respectively,themicrostructureandcrystalorientationofmaterialflowbehaviorarestudiedindetail,thechangeoftissueandtextureOntheimpactofelectromagneticshieldingefficiencyareanalyzed.Onthefirst,proceedinghotpressextrusiononф152mmcastrod,itgeneratetwindeformationforthefirsttimeextrusion.Thenewrecrystallizecrystalgraingeneratedinre-extrusionprocessisverysmall,andtheaveragegrainsizeofthenewis2µm.Textureanalysis,hotextrusionprocessoftheformationofatypical{01−10}fibertexture,andtexturetothestrengthsoftheinitial{01−10}10−17facetogether.AfterthesecondSqueeze,{01−10}surfacetexturestrengenfrom1.26to13.48.Thetestandanalysisofelectromagneticshieldingeffectivenessshowsthattheshieldingeffectincreasedafterhotextrusion.InthehotextrusiononthebasisofsecondarysqueezehasbeensqueezedФ70mmrodsannealing,andin30040mingetofannealing,theaveragegrainsizeofthesmallest,350annealing40minandthengetasmallcrystalaxis,andotherorganizations.Annealingtemperatureto400,andthentherateofcrystallizationoftheexperienceisgrowingup.Textureanalysis,afterannealingprocess,thesurfacetexturesuchas{0110}{0661}{02−21},Itsstrengthchangeswiththestrengthoftheannealingtemperature.Ontheimpactofelectromagneticshieldingefficiencyareanalyzed.Analysisshowsthatthechangesoftextureinhotextrusionprocessofannealingprocess,theimpactofelectromagneticshieldingeffectivenessisin-2dB~4dBinthefrequencyrangeof30MHz~1.5GHz.Forprocessingintoaladderoutofthehot-rolledplateforhigh-temperature,thedeformationquantahotrolledplatewere13%,25%,45%,57%and65%.Inhot-rolledprocess,withdeformationquantaincrease,recrystalgrainscaleescalation,crystaltwintissuetaperinplateorganizations.whenthedeformationquantais65%,therecrystalli-zationorganizationsaccountedformorethan95%.Textureanalysis,{0001}texturecomponentsinthevariable-intensitysmalldecline,andthen,Withtheincreaseofdeformationquanta,gatherringto{0001}1100surface.whenthedeformationquantais65%,thestrengthvalueof{0001}surfacereaches14.37.Thetestanalysisofelectromagneticshieldingeffectivenessshowsthattheelectromagneticshieldingofhot-rolledplates,inwhichthedeformationquantais65%,wasthemosteffective.Keywors:AZ31magnesiumalloy;texture;hotpressextrusion;annealing;hotrolling;electromagneticshiedingeffectiveness:1-1-11.1[1],(EMI)(EMC),,,,21[2]3C(CommunicationsComputerConsumerElectronics)[3][4]1.2-2-1.2.1f100KHz[5][6][7]KHP-21.2.21.11.1[8]dBAlABS45~65(0.5~960MHz)MobayChemicalFe6PP60~8040Cu67(100MHz)ABS80(1000MHz)PP40(1000MHz)Cheng-HsiungPeng[9]Ag1-3-Ni0.5Zn0.5Fe2O4AgNiZn9GHz-25dBMagali[10],8~16GHz,-40dB[11]14kHz~10MHz,SE77dB10~500MHzSE90dB1.31.3.1IIAHCP1.1a=0.320nmc=0.520nmα=β=90°γ=120°(c/a)1.62361.6331.11.11.21.75~1.90g/cm364%23%25%-4-1.31.2[12]24.305012/13−⋅molcm14.02λ/11−−⋅⋅KmW153.6556/650mn⋅Ω/ρ47/1090(273-373K)3.910-3a/nm0.32049/GPa45c/nm0.521070.35c/a1.6236/V-2.37/nm0.320Hall-Petch/21mMPa⋅280/3−⋅mkg17361.3[13]AZ91DAM60A380ABSQ215g/cm31.811.792.741.057.86Mpa23022032045335~450138.1122.9116.842.942.6~57.3Gpa45457221190~21024.925.126.32024.2~26.7[2,14]130-50%50%AZ311.77AZ611.802/32/51/421-5-,345671.3.214[15]AZ(Mg-Al-Zn-Mn)AM(Mg-Al-Mn)AS(Mg-Al-Si)AE(Mg-Al-RE)AZAZ91AM-6-AM60ASAS41BAS21SiMg2SiAEAE41AE42AEASAE42(Mn-4%Al-2%RE)Mg-AlAE42Mg-Al-Si200~250[16]2Mg-AlMg-ZnMg-MnMg-REMg-ThMg-LiMg-MnMg-Al-ZnMg-Zn-ZrMg-LiMg-ThMg-Mn-REMg-Zn-Zr-REMg-Al-REMg-Zn-REMg-RE[17]Mg-MnMg-MnASTMM1AGB/T5153-1985MB1MB8Mg-Al-Zn-MnMg-Zn-Zr4-6%1-7-Mg-ZnZnMg-REMg-Li15%-25%Mg-Li1.3.321206080%~90%60809020%1[18]2PNGV3680%-8-33C3C3CcomputercommunicatiomconsumerelectronicsIBMABSAZ91D1.4mm30~200MHz90dB,Cu2µm+Ni0.25µmABS30MHz35dB200MHz55dB[19]50%60%Notebook30%4[18]191677mm120mmBATL6Wombat,,,,,1-9-51.41.4.1Partidge[20](i)VonMises(ii)Schmid(iii)(CriticalResolvedShearStressCRSS)(iv)acc+a1.41.2PobertsRaynorChapman225[21]225225Bakarian[22]330{1010}6{1010}-10-{0001}l120{1010}{1011}(CRSS)0.60.7MPa40Mpa1.4[23]Burgers/()0001a021132{}0110a021132{}1110a021164{}2211c+a2311651.21.4.2HCP[24,25]a2[1120]_(0001)a1a3ca{0001}1120_a2a1a3c[1120]__a{1010}1120_(1100)_a2a1a3c(1101)__a{1011}1120_[1120]_a1a2a3c(1122)__c+a{1122}1123__[1123]__1-11-1.3γK1η1K1firstundistortedplaneK2K'2η1η2K1[83]K1η1K2η24K1η1K1K11.3[26]{1012}1.4{1012}K11011{1012}K2-12-Sη1K1K2K2S‹1011›η2[27]1.4[26]1.5AZ31αMg17Al12Mg17Al12Mg17Al12Mg17Al12AZ31a=1.05438nmMg17Al12Mg17Al12Mg205Mg17Al12[28,29]Mg17Al12AZ91AZ914γ-Mg17Al1290%Burgers1-13-CrawleyPoter{112}γHall-Petchδs=δ0+1/2δsδoAZCCaSr600MPa[30](TRT)(CM)[31]1.61.6.1()[32]1924(WeverF)X(PoleFigure—PF)(HarrisGB)(BarrettCS)1940(InverseP