简介:ThemorphologyandcrystallographyofphasesintheCu-0.12%Zralloywereinvestigatedbyscanningelectronmicroscope(SEM),transmissionelectronmicroscope(TEM),andhigh-resolutiontransmissionelectronmicroscope(HRTEM).Theresultsshowthattheas-castmicrostructureofCu–ZralloyismainlyCumatrixandeutecticstructurewhichconsistofCuandCu5Zrphaseswithafinelamellarstructure.Thedisk-shapedandplatelikedCu5Zrphaseswithfccstructurearefoundinthematrix,inwhichhabitplaneisparallelto{111}aplaneofthematrix.BetweenthecoppermatrixandCu5Zrphase,thereexistsanorientationrelationshipof[112]a||[011]Cu5Zr;(111)a||(111)Cu5Zr.ThespacestructuremodelofCu5Zrphasecanbeestablished.
简介:Abosonicconstruction(withcentralchargec=2)ofLiealgebrasW1+∞andW1+∞(glN),aswellasthedecompositionsintoirreduciblemodulesaredescribed.AndforW1+∞,whenrestrictedtoitsVirasorosubalgebraVir,abosonicconstructionandthesamedecompositionforVirareobtained.
简介:InordertosuppressthesurfacecrackinginducedbyCuduringreheatingandhotrollingprocess,Cuenrichmentanditsmigrationatthesteel-scaleinterfacewasinvestigatedduringheatingofsteelcastattemperaturesbetween1000℃and1200℃inN2-O2andN7-H2Oatmospheres.ForoxidationofCucontainingsteel,CuenrichedphasewasformedbythepreferentialoxidationofFeandtheenrichmentandmigrationbehaviorofCudependsontheoxidationtemperature,steelchemistryandatmospherecondition.NiinsteelinducedtheformationofsolidCuandNienrichedphaseatsteel/scaleinterfaceandinscalelayerandtheformationofunevensteel/scaleinterface,whichsuppressestheCuenrichmentbecauseofextrusionofCuenrichedregionbeforetheformationofliquidphase.Ontheotherhand,SnadditionpromotestheliquidCuformationatsteel/scaleinterfaceandpenetrationintograinboundaryofCuenrichedphasebydecreasingsolidustemperatureandsolubilitylimit.Inaddition,foroxidationat1200℃,thebehaviorofCuatandaroundthesteel-scaleinterfacewasfounddependenttoalargeextentonmorphologyoftheoxidescaleformedduringoxidation.Attheearlystageofoxidation,Cu-richphaseformedandaccumulatedatthesteelscaleinterfaceunderbothO2-N2andH2O-N2atmospheres.Astheoxidationproceeded,however,Cuenrichmentatanditsmigrationfromthesteel-scaleinterfacewerevastlydifferentfordifferentoxidizingatmospheres.InthecaseofO2-N2oxidation,anoxidelayerformedinitiallyatthesteelsurface,butsoonafteragapwasdevelopedatthesteel-scaleinterfaceandgrewinitssize,whichpracticallyseparatedthescalefromthesteelsubstrate.Thescalelayerformedunderthisconditionwasporous.TheCu-richphaseinitiallyformedattheinterfacewasfoundmigratingtothescalelayer,leavingnoCu-richphaseattheinterface.InthecaseofH2O-N2oxidation,however,thescalelayerformedwasdenseandtightlyattachedtothesteelsurface,andtheCurich-phasecontinuedto
简介:在传统的利用化爆和二级轻气炮作为驱动源的状态方程阻抗匹配实验中,为了考核不同标准材料的可信度,采用了标准材料交叉检验技术。即依次利用这些标准材料作为测量某个待测材料测量雨贡纽线的标准材料,通过比较待测材料雨贡纽线数据的一致性实现对这些标准材料的检验。2004年在神光-Ⅱ装置上完成的二倍频激光Al-Cu和Cu-A1阻抗匹配实验,是一种交叉实验。这两类实验不仅铝、铜二者互为标准材料和待测材料,而且实验包含了正反阻抗匹配两种类型:铝-铜正阻抗匹配实验中冲击波由低阻抗铝进入高阻抗待测材料铜,铜-铝反阻抗匹配实验中冲击波由高阻抗铜进入低阻抗待测材料铝中。
简介:TheroleoftemperatureontheoxidationdynamicsofCu2OonZnO(0001)wasinvestigatedduringtheoxidationofCu(111)/ZnO(0001)byusingoxygenplasmaastheoxidant.AtransitionfromsinglecrystallineCu2O(111)orientationtomicro-zonephaseseparationwithmultipleorientationswasrevealedwhentheoxidationtemperatureincreasedabove300°C.TheexperimentalresultsclearlyshowtheeffectoftheoxidationtemperaturewiththeassistanceofoxygenplasmaonchangingthemorphologyofCu(111)filmandenhancingthelateralnucleationandmigrationabilitiesofcuprousoxides.Averticaltop-downoxidationmodeandalateralmigrationmodelwereproposedtoexplainthedifferentnucleationandgrowthdynamicsofthetemperature-dependentoxidationprocessintheoxidationofCu(111)/ZnO(0001).
简介:针对化探样品批量大,元素多,检出限低等特点,采用水平电极撒料法,对化探样中多种微量元素进行了光谱定量分析。将样品与缓冲剂1:1混匀,采用W-100光栅摄谱仪(光栅刻线1200条,毫米,二级光谱)进行水平撒样摄谱,谱板经暗室处理后,在东德GFE760u测微光度计上用P标尺测光,以AP—logc绘制工作曲线,查出含量。本法采用了特制的撒样漏斗,改善了下料的均匀性,提高了分析精度;以Ge和Pd作内标消除工作条件变化对谱线强度的影响;同时还试选了SiO2:C:Na2SO4=61:30:9的混合物作缓冲剂,提高了弧烧的稳定性,获得了较高的再现性。本文还采用了一种单元素线减光器对Ag3382.9进行减光,使舷的测定上限由5×10-6提高到30×10-6。本法操作简便快速,成本较低,一次可测定Ag、W、Mo、Sn、Bi、Cu、Pb、Zn、Ni、Co、Cr等多种元素,检出限为Ag0.03×10-6,W0.5×10-6,Mo0.05×10-4,Sn0.4×100-6,Ph1×10-6,Zn3×10-6,Cu0.5×10-6,Bi0.1×10-6,Ni0.3×10-6,Co0.3×10-6,Cr1×10-6,基本上达到了化探普查找矿定量分析的要求。
简介:介绍一种金属/合金的生产方法,用于恒电流和恒电位条件下由混合硫化物(Cu2S,NiS)生产Cu-Ni合金,称为直接电化学还原(DER)。研究槽电压和槽电流等工艺参数对还原得到的化合物组成的影响,以生产工业所需的CuNi10,CuNi20和CuNi30等合金。在1200°C下采用循环伏安法(CV)考察Cu2S和NiS在CaCl2熔体中的电化学行为。根据CV研究结果,Cu2S的阴极还原是一步完成的,即Cu2S?Cu;NiS的阴极还原则分两步进行,即NiS?Ni3S2?Ni。恒电流研究表明,在10A电流下电解15min,可制备出最高硫含量为320×10-6的高纯CuNi10合金。扫描电子显微镜以及能量色散X射线能谱和光学发射光谱(OES)测试结果表明,在2.5V电压下直接电化学还原15min,可制备出杂质含量低(即硫含量小于60×10-6)的所选成分的Cu-Ni合金。
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简介:为了庆祝Focal发展的重要里程碑,原厂推出了Chorus826W30周年限量纪念版本,Chorus826W延续既有Chorus的造型,但细节更为精进,可说是AMG版本的Chorus。铝镁合金内凹式TNV高音单元安装在铝合金框架上,高频延伸直上28kHz。