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78 个结果
  • 简介:在这份报纸,纺纱冰上的无磁性的Y离子的冲淡效果加重Dy2Ti2O7由红外线并且拉曼系列和磁化大小被调查。与温度弄软减少的异常声子在父母被发现并且冲淡除了之外,做的混合物,和Y能放松弄软声子233附近的红外模式?厘米<啜class=“a-plus-plus”>显示在纺纱冰材料联合的强壮的phononphonon的1,。当冲淡的水平不很高时,磁化大小表明无磁性的杂质严重地不处于扎根的状态影响纺纱冰规则。然而,大量冲淡提高混乱并且因为集体旋转扭动簇不再是可得到的,打破纺纱冰状态。

  • 标签: 稀释效应 声子振动 磁化 基态自旋 冰物质 高温软化
  • 简介:"GasTransmittingFromWesttoEastProject"issignificant.Itshouldensuretheweldingqualityandsafetyofpipeline.Thetaskisveryarduoustoguaranteethequalityoftheprojectintheconditionoflongline,complexweatherandgeologyfeatures.Inthispaper,theweldingcoldcrackingsusceptibilityofdomesticX-70pipelinesteeladoptedbytheproject,whichisoneofthemostinterestingquestionsofweldingqualityaboutpetrolpipeline,wasstudiedbymeansofobliqueY-groovecrackingtest.Thecrackratioofsurfaceandsectionwastestedundertheconditionsofdifferentweldingmaterialsandpreheattemperature.TheX-70pipelinesteelhasgoodcrackresistance.Theresearchhasimportantvaluefortheconstructionoflarge-scalepipelineengineeringandtheapplicationofdomesticX-70pipelinesteel.

  • 标签: 预加热 倾斜 Y形开槽断裂测试 X-7D管道钢 冷裂磁化率 焊接质量
  • 简介:Anewseriesofrareearthcompounds,Y2-xErxMo4O15(x=0.0-2.0),weresynthesizedandtheirstructuresweredeterminedbypowderX-raydiffraction(XRD).RietveldanalysisofXRDpatternsrevealsthatthecompoundsofthisseriescrystallizeinmonoclinicsystemwithspacegroupP21/c.Thelatticeparametersa,b,c,βandtheunitcellvolumeVde-creaselinearlywithincreasingErcontent.Thethermalexpansionpropertiesofthesecompoundswerestudiedunderhigh-temperatureXRD.PositivethermalexpansionsofcompoundsY2-xErxMo4O15arefoundtobeanisotropicalongthethreecrystallographicdirectionswhereaandcaxesexpandwhilebaxiscontractsinthewholetemperaturerange.Byanalysisofdata,theexpansionofweakbandMo2-O14withrisingtemperatureshouldberesponsibleforpositivethermalexpansion.

  • 标签: 热扩散 晶体结构 钼酸盐 X射线衍射
  • 简介:有五个分支的像花瓣的icosahedralquasicrystal,被认为是icosahedralquasicrystal的代表性的形态学,在Y富有的Mg-Zn-Y第三的合金被观察了。而且,像多角形的形态学,icosahedralquasicrystal的另一个模式,也在Y富有的Mg-Zn-Y第三的合金被发现了。后者形态学源于以前的进化。icosahedralquasicrystal的像花瓣的形态学的生长机制也被讨论。Alloying作文,即,Y元素内容,是导致icosahedralquasicrystal的形态学进化的一个主要因素。

  • 标签: Mg-Zn-Y三重合金 准晶体 形态进化 钇元素
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  • 简介:Aluminiumoxidedispersionstrengthenedcopperproducedbythermochemicalprocess;Aninvestigationonthehotextrusionprocessofmagnesiumalloysheet;ComparisonbetweenConventionalPMRouteandCastingMethodtoobtainAMCsReinforcedwithTi-AlParticles;CONFORMprocess:surfaceseparation,curlingandprocesscharacteristicstothewheeldiameter;Determinationofweldingpressureinthenon-steady-stateportholedieextrusionofimprovedAI7003hollowsectiontubes

  • 标签: 挤压比 铜铝氧化复合物 生产工艺 密度分布 机械性质
  • 简介:ElectrodeProcessofY(Ⅲ)onNickelElectrodeandSurfaceMetallizingZhouChungen(周春根)(UniversityofAeronauticsandAstronauticsBeijing,Be...

  • 标签: Yttrivm ELECTRODE PROCESS METALLIZING CYCLIC VOLTAMMETRY
  • 简介:EnthalpyofReactionsinY-Ba-Cu-OSystemShaWei沙维(Departmentof.MaterialsScienceandMetallurgy,UniversityofCambridge.U.K.)Received17...

  • 标签: THERMODYNAMIC PROPERTIES SUPERCONDUCTORS PHASE TRANSFORMATION
  • 简介:ThispaperdealswiththestructureoftheY^Ⅲcomplexwithaminopolycarboxylicacids,synthesisandstructuraldeterminationofthecomplex(NH4)[YⅢ(edta)(H2O)3]·3H2O(edta=ethylenediaminetetraaceticacid).Thecrystalandmolecularstructuresofthe(NHO[YⅢ(edta)(H2O)3]·3H20complexhavebeendeterminedbysingle-crystalX-raystructureanalysis.Thecrystalofthecomplex(NH4)[YⅢ(edta)(H2O)3]·3H2Obelongstoorthorhombiccrystalsystemandfdd2spacegroup.Thecrystaldataareasfollows:a=1.9441(9)nm,b=3.5459(18)nm,c=1.2196(6)nm,V=8.407(7)nm3,Z=16,M~=503.25,Dc=1.590g.cm3,μ=2.844mm-1andF(000)=4160.ThefinalRandRware0.0486and0.1332for3388(I>2σ(I))uniquereflections,respectively.Thecomplexanion[YⅢ(edta)(H2O)3]hasapseudo-mono-cappedsquareantiprismaticnine-coordinatestructureinwhichthesixcoordinateatoms(twoNandfourO)arefromanedtaligandandthreewatermoleculescoordinatetothecentralYⅢiondirectly.Fromtheresultsitcanbepredictedthattheymioncanalsoformanine-coordinatecomplexwithttha(=triethylenetetraminehexaaceticacid)ligand,sotheradioactivecomplexanion[99YⅢ(Httha)]2-cansupplyafreecarboxylgroup(-CH2COOH)beingusedformolecularembellishmenttoformtheTDDSforthetreatmentofcancers.

  • 标签: EDTA 结构 合成 稀土
  • 简介:MechanicallyactivatedW-Cupowdersweresinteredbyasparkplasmasinteringsystem(SPS)inordertodevelopanewprocessandimprovethepropertiesofthealloy.Propertiessuchasdensityandhardnessweremeasured.ThemicrostructuresofthesinteredW-CualloysampleswereobservedbySEM(scanningelectronmicroscope).Theresultsshowthatsparkplasmasinteringcanobviouslylowerthesinteringtemperatureandincreasethedensityofthealloy.Thisprocesscanalsoimprovethehardnessofthealloy.SPSisaneffectivemethodtoobtainW-Cupowderswithhighdensityandsuperiorphysicalproperties.

  • 标签: 钨铜合金 粉末冶金 机械活化 火花等离子体烧结
  • 简介:作为La-Mg-Y系统的一个例子,方法怎么建立单个阶段的热力学的模型在热力学的优化的过程被介绍。答案阶段(液体,以身体为中心立方,以脸为中心立方、包装hexagonalclose、双六角形拥挤不堪)与Redlich-Kister方程被建模。Thecompound精力模型被用来在La-Mg-Y系统描述金属间化合的混合物的热力学的函数。在La-Mg-Y系统的混合物Mg_2Y,Mg_(24)Y_5,Mg_(12)La,Mg_(17)La_2,Mg_(41)La_5,Mg_3La和Mg_2La被当作公式(Mg,Y)_2(La,Mg,Y),Mg_(24)(La,Mg,Y)_4Y,Mg_(12)(La,Y),Mg_(17)(La,Y)_2,Mg_(41)(La,Y)_5,Mg_3(La,Mg,Y)并且Mg_2(La,Y)分别地。一个模型(La,Mg,Y)_(0.5)(La,Mg,Y)_(0.5)被使用由MgLa和MgY描述复合MgMformed以便在La-Mg-Y系统与CsCl类型结构(B2)应付在body-centeredcubic答案(A2)和MgM之间的顺序混乱转变。单个阶段的吉布斯精力在La-Mg被优化,躺并且由CALPHAD的La-Mg-Y系统技术。液体的Theprojection我们为La-Mg-Y系统的表面被预言。包括Mg,艾尔,Cu,Ni,Mn,Zn和稀土元素形成的36二进制代码和15三元系统的基于Mg的合金数据库元素在SGTE被安装标准。

  • 标签: 镧-镁-钇系统 热力学模型 CALPHAD方法 有序-无序转换 镁基合金
  • 简介:采用电导率、显微硬度、扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究Al-0.30Zr与Al-0.30Zr-0.08Y合金的微观组织与性能。铸态Al-Zr-Y合金中微米尺度初生Al3Y相通过共晶反应在晶内和晶界上同时生成。在Al-Zr-Y合金中,Y明显加速了Al3Zr(Ll2)的析出动力学。由于较大体积Al3(Zr,Y)析出相的生成,Al-Zr-Y合金的电导率明显高于Al-Zr合金的。在Al-Zr-Y合金中观察到了高密度的弥散球状Ll2结构Al3(Zr-Y)析出相。Al-0.30Zr-0.08Y合金具有比Al-0.30Zr合金更强的抗再结晶能力。

  • 标签: Al-Zr-Y合金 热处理 再结晶 微观组织 力学性能
  • 简介:CurieTemperatureofAmorphousFeSiBandFeWSiBAloysWangLingling,ZhaoLihua,HuWangyu(王玲玲)(赵立华)(胡望宇))DepartmentofPhysics,HunanUn...

  • 标签: CURIE TEMPERATURE FeSiB and FeWSiB ALLOYS