简介：TheintermetalliccompoundZr1-xTixCowaspreparedanditssuitabilityforhydrogenstoragewasinvestigated.ThealloysobtainedbymagneticlevitationmeltingwiththecompositionofZr1-xTixCo(x=0,0.1,0.2and0.3,at.%)showsinglecubicphasebyX-raydiffraction.Asingleslopingplateauwasobservedoneachisothermal,andpressure-composition-temperature(PCT)measurementresultsshowthattheequilibriumhydrogendesorptionpressureofZr1-xTixCoalloyincreaseswithincreasingTicontent.Thedesorptiontemperaturesforsupplying100kPahydrogenareabout665,642,621and614KforZrCo,Zr0.9Ti0.1Co,Zr0.8Ti0.2CoandZr0.7Ti0.3Coalloy,respectively.RepeatedhydrogenabsorptionanddesorptioncyclesdonotgenerateseparatedZrCo,TiCoandZrH2phases,indicatingthatalloyshavegoodthermalandhydrogenstabilization.

简介：ThestructureandintrinsicmagneticpropertiesofRFeM（M=VorTi）,type1:12,havebeenstudiedbymagneticmeasurementandX-raydiffraction.Theyarebody-centeredtetragonalThMn12structure.Thechangesofcrystallatticeconstantscoincidewiththatoftheirelementradii.Curietemperatureisdecidedmainlybytheexchangeinteractionsof3d-3dand3d-4fatompairs.Thedataobtainedbymean-fieldapproximationagreewellwithexperimentalvalues.ThemagneticmomentcouplinginthesecompoundsforLREisferromagnetic,andforHREisantiferromagnetic.Atlowtemperature,anisotropyfieldisdecidedbyREsublattice.Inthispaper,theinfluenceofmagneticpropertiesofcobaltandnickelreplacingironhasalsobeenstudied.

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简介：Inthisstudy,thecharacterizationandmodificationofwastemagnesiumchips(WMCs),whichwereproducedbyplasticmoldinginagoldmanufacturingfactoryandareusedasMg-richintermetalliccompositesinstoringhydrogen,werediscussedindetail.WMCswereanalyzedusingX-raydiffraction(XRD),X-rayfluorescence(XRF)spectroscopy,differentialscanningcalorimetry(DSC),scanningelectronmicroscopy(SEM),andBrunauer-Emmett-Teller(BET)analysistocharacterizethematerials’structuralproperties.Mechanicalmilling,organictreatment,andinorganicsaltadditionwerecarriedouttomodifytheWMCs’surfacetoprepareMg-richintermetalliccompositesforstoringhydrogen.Themodifiedsampleswereanalyzedusinghigh-pressurevolumetricanalysestocalculatetheirhydrogenstoragecapacity.TheauthorsconcludethatmodifiedWMCwaspromisingasanMg-richintermetalliccompositethatwassuitableforuseinhydrogenstoragewitha4.59wt%capacityat320Cunderahydrogenpressureof60bar.

简介：Ni/SiO2andbimetallicNixGa/SiO2catalystswithdifferentNi/Gaatomicratios(x=10~2)wereinvestigatedfortheselectivehydrogenationofacetylene.ItwasfoundthatNixGa/SiO2showedhigherselectivitytoethylenethanNi/SiO2.ThisisattributedtotheformationNi-GaalloyandNi3Gaintermetalliccompound(IMC)wheretherewasachargetransferfromGatoNi,whichisfavorableforreducingtheadsorptionstrengthandamountofethyleneonNiatoms.Asaresult,theover-hydrogenation,theC–Cbondhydrogenolysisandthepolymerizationweresuppressed,andsubsequentlytheselectivitytoethylenewasenhanced.WiththedecreaseofNi/Gaatomicratio,theactivityandstabilityoftheNixGa/SiO2catalystsincreasedfirstandthendecreased,whiletheethyleneselectivitytendedtoincrease.Ni5Ga/SiO2exhibitedthebestperformance.Undertheconditionsof180°C,0.1MPa,andareactant(1.0vol%acetylene,5.0vol%H2and94vol%N2)withthespacevelocityof36,000mLh-1g-1,theacetyleneconversionmaintainedat100%onNi5Ga/SiO2during120htimeonstreamandtheselectivitytoethylenewas75%~81%afterreactionfor68h.ItwasalsofoundthattheformationofNi-GaalloyandNi3GaIMCsuppressedtheincorporationofcarbontoformNiCx,subsequentlyenhancingthecatalyststability.Additionally,withincreasingtheGacontent,thecatalystacidamountandstrengthtendedtoincrease,whichpromotedthepolymerizationandcarbondepositionandsothecatalystdeactivation.

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简介：Soldersizeeffectonearlystageinterfacialintermetalliccompound(IMC)evolutioninwettingreactionbetweenSne3.0Age0.5Cusolderballsandelectrolessnickelelectrolesspalladiumimmersiongold(ENEPIG)padsat250Cwasinvestigated.TheinterfacialIMCstransformedfrominitialneedle-androdtype(Cu,Ni)6Sn5tododecahedron-type(Cu,Ni)6Sn5andthentoneedle-type(Ni,Cu)3Sn4attheearlyinterfacialreactionstage.Moreover,theseIMCtransformationsoccurredearlierinthesmallersolderjoints,wherethedecreasingrateofCuconcentrationwasfasterduetotheCuconsumptionbytheformationofinterfacial(Cu,Ni)6Sn5.Onthermodynamics,thedecreaseofCuconcentrationinliquidsolderchangedthephaseequilibriumattheinterfaceandthusresultedintheevolutionofinterfacialIMCs;onkinetics,largersolderjointshadsufficientCufluxtowardtheinterfacetofeedthe(Cu,Ni)6Sn5growthincontrasttosmallersolderjoints,thusresultedinthedelayedIMCtransformationandtheformationoflargerdodecahedron-type(Cu,Ni)6Sn5grains.Insmallersolders,nospallingbuttheconsumptionof(Cu,Ni)6Sn5grainsbytheformationof(Ni,Cu)3Sn4grainsoccurredwheresmallerdiscrete(Cu,Ni)6Sn5grainsformedattheinterface.

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简介：铁(Fe)在铝(艾尔)有低稳固的溶解度，并且它通常形成Fe富有的金属间化合的混合物。钪(Sc)是能充当谷物的一个元素更精制，修改最容易溶解的硅并且同时改变Fe富有的金属间化合的混合物的形态学。现在的工作被进行在Al-7Si-0.3Mg的机械性质上学习Sc的效果。合金被准备由压榨在Fe的二个层次扔(0.2和0.4?wt%)并且Sc的三个层次(0wt%，0.2wt%并且0.4?wt%)。Sc被发现增加合金的机械性质，包括它的坚硬，收益力量和最终的张力的力量。在0.2点?wt%Fe，当维持好延伸时，增加的Sc增加力量。在0.4点?wt%Fe，增加的Sc增加力量，但是减少延伸稍微。金属间化合的混合物和最容易溶解的硅的分布和形态学影响延伸。Fe富有的金属间化合的混合物和Sc富有的金属间化合的混合物充当裂缝开始地点。0.2?wt%Fe?+?0.2?wt%Sc合金有这些金属间化合的混合物的最低数量，并且最容易溶解的硅小、含纤维。那么，它有最高的延伸。