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。

简介：ＥｌｅｃｔｒｏｄｅＰｒｏｃｅｓｓｏｆＹ（Ⅲ）ｏｎＮｉｃｋｅｌＥｌｅｃｔｒｏｄｅａｎｄＳｕｒｆａｃｅＭｅｔａｌｌｉｚｉｎｇＺｈｏｕＣｈｕｎｇｅｎ（周春根）（ＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａｕｔｉｃｓＢｅｉｊｉｎｇ，Ｂｅ...

简介：ＥｎｔｈａｌｐｙｏｆＲｅａｃｔｉｏｎｓｉｎＹ－Ｂａ－Ｃｕ－ＯＳｙｓｔｅｍＳｈａＷｅｉ沙维（Ｄｅｐａｒｔｍｅｎｔｏｆ．ＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＭｅｔａｌｌｕｒｇｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＣａｍｂｒｉｄｇｅ．Ｕ．Ｋ．）Ｒｅｃｅｉｖｅｄ１７...

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.

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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。

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。

简介：Todevelopanewmagnesiumalloywithexcellentformabilityatroomtemperature,theeffectofY,Ce,andGdadditionontextureandstretchformabilityofMg–1.5Znalloyswascarriedout.TheresultshowsthatY,Ce,andGdadditioninMg–1.5Znalloyscaneffectivelyweakenandmodifythebasalplanetexture,characterizedbyTD-splittextureinwhichthepositionofbasalistitledfromnormaldirection(ND)towardtransversedirection(TD).WhenMg–1.5ZnalloywithGdadditionappearslowtextureintensityandTD-splittexture,wherethepositionofbasalpolesistiltedbyabout±35°fromNDtowardtoTD,thelargestErichsenvalueof7.0andtheelongationratereaches29.1%inTDdirection.However,YandCeadditioninMg–1.5Znalloyspromotealargenumberofsecondphaseparticles,whichcancelthecontributionoftheuniquebasaltexturetostretchformabilityandductility.

简介：ThemixturemodelofAl85Y4Nd4Ni7alloyinwhichapartiallycrystallizedamorphousalloyisregardedasananocompositeofanAlnanoparticleandaremainingamorphousmatrixispresented.Itsevolutionintheprocessofcrystallizationhasbeeninvestigatedbydifferentialscanningcalorimetry(DSC),X-raydiffraction(XRD),andtransmissionelectronmicroscopy(TEM).Mainlyamorphousstructurewithα-Alnanocrystalsembeddedintheamorphousmatrixhasbeenrevealedbymeltspiningthealloy.Crystallizationisshowedtooccurinthreestages:(1)crystallizationofamorphousalloyandformationofAlNiY,AlNdNiandunknowncrystallinephases,(2)formationofAl3YandAl3Nd,and(3)formationofAl3Ni.

简介：大型轧机用滚动轴承绝大部分都采用柱销焊接保持架结构，其具有承载大等优点，但在使用过程中，早期失效往往发生在保持架焊接部位。本文对典型失效轴承进行了宏观检查、断口分析、低倍检验、金相分析及轴承的运动状态分析。结果表明，焊接工艺失控导致柱销焊接端存在焊接未融合等缺陷是引起此类轴承早期失效的主要原因，并提出了在大型柱销焊接式保持架轴承的结构设计、柱销材料的选择以及焊接工艺质量控制等方面的改进建议。

简介：某批换热器在浮头盖装配时高强螺柱前后出现两次断裂现象，通过现场调查、化学成分、力学性能、宏观断口、金相观察、结构应力计算及螺柱制造工艺调查等方法，对其断裂原因进行综合分析。结果表明：螺柱和螺母咬合在一起的应力集中是致使最大剪应力超过材料的抗剪强度、导致螺柱扭断的主要原因，最大等效应力明显大于抗拉强度，致使断裂处材料因其高强度而表现出脆性断裂；热处理工艺执行不到位是造成螺柱断裂的次要原因，是螺柱批量生产中堆积装炉热处理的不规范操作所致；螺柱经真空回火热处理后提高了力学性能和硬度，规范紧固件装配操作过程后，满足了使用要求。

简介：Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr(GWN751K)镁合金的行为发展在热变丑过程期间被讨论。在0.002～2.000s的紧张率范围上的镁合金的流动压力行为?1并且在623～773的温度范围，K在60%的最大的变丑度下面在一个Gleeble-1500D热模拟器上被学习。试验性的结果证明在应力和紧张之间的关系被紧张率和变丑温度显然影响。GWN751K镁合金的流动压力能被Zener-Hollomon参数在夸张Arrhenius类型方程在高温度变丑期间代表。压力代表n和变丑激活精力Q被线性回归分析评估。压力代表n被适合是3.16。合金的热变丑激活精力在热变丑期间是230.03kJ/mol。热变丑的微观结构被紧张率和压缩温度也强烈影响。合金能与0.2=的机械性质在723K被渗出，这被发现260MPa，b=320MPa，和=18%。

简介：研究Cu-Mg-Te-Y合金在铸态、热轧态、冷轧态的组织和元素分布；讨论不同退火温度对Cu-Mg-Te-Y合金组织的改变；分析轧制和退火温度对Cu-Mg-Te-Y合金性能的影响。结果表明，不同的轧制工艺获得的合金组织与铸态合金组织相比差别明显，轧制后合金中Mg元素分布比铸态合金的更加均匀，Cu-Mg-Te-Y合金热轧后Cu2Te相被挤碎，尺寸变小，分布更加弥散，继续冷轧后Cu2Te相则被拉长、压扁，呈细条状。冷轧后的Cu-Mg-Te-Y合金在390℃以下退火1h，组织变化不明显，在550℃退火1h后，冷变形产生的纤维状组织发生完全回复再结晶，加工硬化效果消失，抗拉强度大幅度下降，导电率上升。退火温度在360~390℃范围内，Cu-Mg-Te-Y合金可以获得较好的力学性能。

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。

简介：Mg–9Li–3Al–1.6Yalloyswerepreparedthroughmixturemethod.Themicrostructure,mechanicalproperties,andcorrosionresistanceoftheas-castandasextrudedalloyswerestudiedbyopticalmicroscopy（OM）,scanningelectronicmicroscopy（SEM）,X-raydiffraction（XRD）,mechanicalpropertiestesting,andelectrochemicalmeasurement.Theas-castMg–9Li–3Al–1.6Yalloywiththeaveragegrainsizeof325lmiscomposedofb-Limatrix,blocka-Mg,andgranuleAl2Yphases.Afterextrusion,thegrainsizeoftheas-castalloyisobviouslyrefinedandreachesto75lm;thestrengthandelongationoftheextrudedalloyareenhancedby17.20%and49.45%,respectively,owingtotheirfinemicrostructureandreductionofcastingdefects.Theas-extrudedalloyshowsbettercorrosionresistancecomparedtotheas-castone,whichmayberelatedtothelowstoredenergyanddislocationdensityintheextrudedalloy,alsothehomogenizationtreatmentbeforeextrusion.

简介：AnexperimentalMg97Zn1Y2(molarfraction,%)alloywasproducedbyrollingtheas-castalloy.Themicrostructureofthealloyiscomposedoftheα-Mg(alsomarkedas2H-Mgwithreferencetolong-periodstackingstructureaccordingtohexagonalclosepackedstructure)andlong-periodstacking(LPS)phase.TensiletestsofMg97Zn1Y2alloyincomparisonwithpureMgwereconducted.Thefracturemorphologiesofthetensilespecimenswerecharacterizedandthemicrostructuresnearfracturesurfacewereobserved.TheresultsshowthattherolledMg97Zn1Y2alloyshowsamixedfracturemodeincludingdimplesindicatingaductilefracturepatternandasmallfractionofcleavageplanesindicatingabrittlefracturepattern,whichisdifferentfromthesinglebrittlefractureoftheas-castalloy.Inaddition,theplasticdeformationismainlyfromdislocationsinducedstrainwithsmallstrengtheningeffectduringplasticdeformationintheas-castMg97Zn1Y2alloy,andthestrainhardeningrateissimilartothatoftheas-castpuremagnesium.ThedeformationmechanismofMg97Zn1Y2alloyisdifferentfromthatofthepuremagnesiumaccordingtoametallographicalobservationthatwhethertwinsarefoundornot.ThestrengtheningeffecthardlyexistsintherolledMg97Zn1Y2alloyunderthesamedislocationsinducedstrain,whichisdifferentfromthatoftheas-castalloywithmoderatestrengtheningeffect.

简介：有起始的equiaxed微观结构的BT25y合金的高温度的塑料变丑行为被热压缩测试调查。处理地图被建立评估力量驱散效率()并且识别流动不稳定性区域。当紧张活动范围稳定状态时，处理窗户的最佳在盖住大多数学习变丑温度和1的紧张率的区域被散布吗？

简介：TheslidingfrictionandwearbehaviorsofMg–11Y–5Gd–2Zn–0.5Zr(wt%)alloywereinvestigatedunderoillubricantconditionbypin-on-diskconfigurationwithaconstantslidingdistanceof1,000minthetemperaturerangeof25–200°C.Resultsindicatethatthevolumetricwearratesandaveragefrictioncoefficientsdecreasewiththeincreaseofslidingspeeds,andincreasewiththeincreaseoftesttemperaturebelow150°C.ThehardandthermallystableMg12(Y,Gd)Znphasewithlong-periodstackingorderstructureinthealloypresentssignificantwearresistance.Thewearmechanismbelow100°Cisabrasivewearasaresultofplasticextrusiondeformation.Thecorporateeffectsofsevereabrasive,oxidative,anddelaminatingwearresultinthetribologicalmechanismabove100°C.

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.