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ID:36467704
大小:2.51 MB
页数:70页
时间:2019-05-10
《等径弯曲通道变形制备超细晶FeCoV合金及磁性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西安建筑科技大学硕士学位论文等径弯曲通道变形制备超细晶FeCoV合金及磁性能研究姓名:伍来智申请学位级别:硕士专业:材料加工工程指导教师:杜忠泽;王经涛20060601两安建筑科技大学硕士论文MagneticpropcrtiesofUltea—fineGrainedFeCoVAlloyproducedbyEqualChannelAngularPressingSpecialty:MaterialProcessingEngineeringName:WuLaizhiInstructor:DuZhongze
2、WangJingtaoAbstractTheFeCoValloy,akindofindustrialsemi-magneticmaterial,iswidelyusedastherotorofmagneticretardationelectromotorbecauseofitsexcellentmagneticretardationperformance.Withthedevelopmentofsociety,requirementsofmagneticretardationmaterialsare
3、increasing,buttheusualprocessingroutecannotmeettherequirementforitslimitationsThispaperputsforwardanewprocessingWay,equalchannelangularpressing(ECAP),toimprovethemagneticretardationofFeCoValloyThefeatureofthestyleisthatitcanobtainlargetruestrainafterpe
4、rpassdeformation,whichwasoftenusedtoobtaintheultra—finedgrainedmaterialbecauseitcarlrealizesevereplasticshearingdeformation.ThepapermainlystudiedthefeasibilityusingECAPtomakeblocksemi—magneticmaterial.EqualchannelangularprocessingoftheFeCoValloywassucc
5、essfullycarriedoutatroomtemperaturewithrouteAinthisstudy,obtainingatotalequivalenttruestrain--4.ThemicrostructureevolutionofFeCoValloyinECAPanddrawingtemperwasinvestigatedbymeansofTransmissionElectronMicroscopy(TEM).Itsmagneticperformanceafterdrawingte
6、mperwasalsomeasured,analyzedandcompared.Themainresultsareasthefollowing:(1)theblockUltra-finegrainFeCoVAlloywassuccessfullymadeintheexperiment.(2)Thephenomenonofnanocrystalprecipitationcanbeobservedinthesampleofdrawingtemper,theprocessofnanocrystalprec
7、ipitationasfollows:firstly,somebigcarbideparticlesseparatefromtheboundaryofequiaxialsubgrainandtheboundaryofthinlath·shaped.Withtheproceedofprecipitation,bigcardideparticlesareseparatedtonanophaseparticles.Thezoneofnanophaseisincreasingandisgrowingwith
8、theincreasingoftempertemperature.InII西安建筑科技大学硕士论文theprocessofnanocrystal,ⅡphaseturnfromdisordertoorderandareenclosednanocrystalYphaseandchangeintosingledomainparticle,presentsuperparamagetism(3)Themoredelormationextentis,thebettermagnet
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