简介：Aneodymiumdopedyttriumaluminumgarnet(Nd:YAG)transparentceramicwasfabricatedbyasolidstatereactionmethodusingcommercialα-Al2O3,Y2O3,andNd2O3powdersasstartingmaterialsandtetraethylorthosilicate(TEOS)assinteringaid.ThemorphologyandmicrostructureofthenanopowdersandtheNd:YAGtransparentceramicwereinvestigated.ThefullydenseNd:YAGceramicwithanaveragegrainsizeof～20μmwasobtainedbyvacuumsinteringat1720°Cfor12h.Fewporesandgrain-boundaryphaseswereobserved.Thein-linetransmittanceoftheceramicwas81.5%at1064nm.

简介：ThesolidsolubilityofCe、La、SmandNdinFeorNiatvarioustemperaturewasdeterminedbymeansofadiffusion-couplemethodwiththeaidofanelectronprobemicroanalyzer.Twomethods,namelyareamethodandwholerangemethod,wereproposedfordataprocessinginthepresentpaper.Theprincipleandre-latedproblemsintheexperimentaldeterminationofthesolidsolubilityofrare-earthelementsinFeorNibyuseoftheabovementionedmethodswerealsodiscussed.

简介：Thecreepmechanismofas-castMg-6Al-6Ndalloywasstudied.Thestressexponentforcreepis5.8undertheappliedstressesof50-70MPaat175°C.Theactivationenergyforcreepis189kJ·mol-1undertheappliedstressof70MPaintherangeof150-200°C.Thetruestressexponentandthresholdstressforcreeparecalculatedas4.96and10.2MPa,respectively.Thetruestressexponentindicatesthatitscreepmechanismbelongstothedislocationclimb-controlledcreep,whichisinagreementwiththemicrostructurechangesbeforeandaftercreep.ThehighvalueforstressexponentisattributedtotheinteractionofAl11Nd3phasewithdislocations.Theactivationenergyismorethantheself-diffusionactivationenergyofMg,whichisattributedtotheloadtransfertakingplacefromthematrixtoAl11Nd3phaseduringcreep.

简介：InordertoobtainultrafineNd-Fe-Bpowder,aspray-driedprecursorwastreatedbyreduction-diffusion(R/D)process.And,unliketheconventionalR/Dprocess,calciumreductionthatisacrucialstepfortheformationofNd2Fe14BwasperformedwithoutconglomeratingtheprecursorwithCapowder.Byadoptingthismodifiedprocess,itispossibletosynthesizethehardmagneticNd2Fe14Batthereactiontemperatureaslowas850℃.TheaveragesizeofNd2Fe14Bparticlesthatareuniformlydistributedintheoptimallytreatedpowderwas＜＜1μm.MostNd2Fe14BparticleswereenclosedwiththinlayersofNd-richphase.TypicalmagneticpropertiesofsuchpowderwithouteliminatingimpurityCaOwereiHc=～5.9kOe,Br=～5.5kG,and(BH)max=～6MGOe.

简介：Sm_(0.9)Pr_(0.1)Fe_xandSm_(1-x)Nd_xFe_(1.9)的结构，磁化，和磁伸缩变瘦电影用X光检查衍射，颤动的样品磁强计，和光伸臂方法被调查了。Sm_(0.9)Pr_(0.1)Fe_xthin电影的结构由一张Sm-Pr-Fe无定形相组成，这被发现什么时候x≤2.69并且Sm_(1-x)Nd_xFe_(1.9)的薄电影由一张Sm-Nd-Fe无定形相组成。有Fe内容的增加的在里面飞机磁化ofSm_(0.9)Pr_(0.1)Fe_x薄电影增加，和茶碱飞机coercivity的低价值发生在1.62≤x≤的范围2.28。当时，有增加Fe的磁伸缩价值ofSm_(0.9)Pr_(0.1)Fe_x薄电影增加满足x≤1.94并且减少什么时候x>1.94。Sm_(1-x)Nd_xFe_(1.9)的在里面飞机磁伸缩在低磁场下面的薄电影被Nd的替换为Sm改进了什么时候x=0.2。

简介：TheCurietemperatureof(Nd1-xPrx)2Fe14CoyBcompounds（x=0,0.2,…,1.0andy=O,2,4,6,14）hasbeendeterminedwithACinitialsusceptibilitymeasurement.ItwasfoundthatthevariationsofCurietempera-turewithxisnotlinearfory=0and14,whereasitislinearforothervaluesofy.Thelatticeconstantsof(Nd1-xPrx)2Fet14BweredeterminedbyusingX-raydiffraction.Thelatticeexpansionwasmostlyalongthecaxis,whereasthatalongthea-axisremainedpracticallyzeroforthewholeseries.ItissuggestedthatPratomsmayshowsitepreferenceinR2M14Bcompounds（M=FeorCo）.DuetothesubstitutionofCoforFe.thetendencyofsitepreferenceofPrbecomeslesspronounced,whichmaybeattributedtothedecreaseofdiffer-enceofcrystalelectricfield（CEF）actingonthetworareearthsiteswiththeintroductionofCoorFe.Incon-trasttothatofthePratoms,thesitepreferenceofCoiu（Nd（1-x）Prx）2Fe（14-y）CoyBcompoundsdoesnotdependonthecompositionoftherareearthsublattice（R=NdorPr）.

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

简介：ThecoercivitymechanismofNd-Fe-Bbasedmagnetspreparedbyanewtechniqueofstripcastingwasinvestigated.Differentfromthetraditionalmagnets,α-FephasesaredifficulttobefoundinNd-Fe-Bmagnetspreparedbystripcasting.Meanwhile,therich-Ndphasesoccurnotonlynearthegrainboundariesofmainphases,butalsowithinthemain-phasegrains.Investigationonthemagnetizingfielddependenceofthecoercivityforthe(Nd0.935Dy0.065)14.5Fe79.4B6.1magnetandthetemperaturedependenceofthecoercivityfortheNd14.5Fe79.4B6.1magnethavebeendone.Resultsshowthatcoercivitiesforstripcastingmagnetsarecontrolledbythenucleationmechanism.

简介：采用Gleeble-3500热模拟试验机对Mg-3.0Nd-0.2Zn-0.4Zr（质量百分数,NZ30K）合金进行等温热压缩试验,变形温度范围为350～500℃,应变速率范围为0.001～1s^-1。为消除变形热的影响,对高应变速率条件下的流变应力进行修正。利用修正后的流变应力数据,建立双曲正弦本构方程。双曲正弦本构方程中的常数可表达为应变的函数。利用建立的本构方程所预测的流变应力与实验结果吻合得较好,说明该本构方程可以用来预测NZ30K合金在热变形过程中的流变应力。

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：由到Mg-Cu-Ag-Gd合金的Nb的次要的增加，Mg-Cu-Ag-Gd-Nb体积有象好机械性质一样的改进热稳定性和腐蚀抵抗的金属性的玻璃(BMG)被开发。Mg54Cu26.5Ag8.5Gd11xNbx(x?=?0，1)有2的一条直径的BMG?公里被扔的铜模子制作。Mg54Cu26.5Ag8.5Gd10Nb1BMG展览扩大了58的supercooled液体区域?K。电气化学的大小显示Nb的增加在增加的腐蚀潜力证实的NaCl答案改进基于Mg的BMG的腐蚀抵抗，尽管在NaOH答案的BMG的腐蚀行为上的Nb的重要效果都没被观察。Mg-Cu-Ag-Gd-NbBMG也显示出高压缩的力量直到890?MPa和大约1.9%的有弹性的紧张。

简介：RadiallyorientedNd–Fe–BringmagnetswerepreparedbybackwardextrusionofMQ-Cpowder.Thepunchchamferradiushasagreatimpactonthemicrostructureandmagneticpropertiesoftheringmagnet.Withthechamferradiuschangingfrom2,5to8mm,thecracksintheinnerwalldecreaseobviouslywhilethecrystallographicalignmentdrops.Furthermore,themechanismofcaxisgrowthwassuggestedtobeacombinationofsheardeformationinthecornerandsolution-precipitationunderthestressparalleltoradialdirection.Thealignmentdropsonthetopofringbecausethegrainsgrowfreelyandsometexturedgrainsgrowthroughnucleationandrecrystallization.Inthepresentwork,theoptimalpunchchamferradiusisfoundtobe2mm,andinthiscase,theremanence,coercivity,andmaximumenergyproductoftheringmagnetachieve1.4T,670kJám,and342kJám,respectively.

简介：Inthisarticle,anovelheattreatmentmethod,deformationheat(DH)treatment(extrusion+aging),wasemployedonahypereutecticaluminumsiliconalloy(LM28-0.3wt.%Nd),anditseffectonmicrostructureandmechanicalpropertiesofthisalloywasinvestigated.ItcanbeconcludedthattheeutecticmicrostructuredisappearsaftertheDHtreatment,inthemeantimethemorphologyofα(Al)solidsolutionwastransformedfromfir-treeandcellulartoequiaxed,Siwasrefinedwithgrainsizesofabout1-10μmanddistributeddispersedly,evensomeofthembecameglobularshape,whichcanreducestressaccumulationeffectively.MechanicalpropertiestestindicatedthattheDHtreatmentcouldsignificantlyimprovetheroom-temperaturestrengthandhavelittleeffectonthehigh-temperaturestrengthofLM28-0.3wt.%Ndalloy.Thefracturemechanismisductilefracturebyfracturemorphologyanalysis.

简介：TooptimizethemagneticpropertiesofnanocompositeNd9Fe85B6magnets,theas-quenchedribbonswithdifferentmicrostructureswerepreparedatsixwheelvelocitiesfrom10to30ms-1throughrapidquenching,followedbyaseriesofannealingtreatmentsat550–800°Cfor5–10min.Itisfoundthatboththelargeinitialgrainsatlowcoolingrateandhighcontentofamorphousphaseathighcoolingratecausea-Fegrainscoarsening,whichleadstoadeclineinthestrengthofexchangecouplinginteractionandthedeteriorationofmagneticproperties.Inordertooptimizethemagneticproperties,theas-quenchedribbonsshouldbechosenwithrelativelysmallinitialgrainsaswellasasmallamountofamorphousphase.FornanocompositeNd9Fe85B6materials,theoptimizedmagneticpropertiesofHcj=446kAm-1,Br=0.86T,(BH)max=80kJm-3areobtainedforribbonspreparedat18ms-1afterannealingat620°Cfor5min.

简介：GrainboundarydiffusiontechniquewithTbH_3nanoparticleswasappliedtofabricateTb-lesssinteredNdFe-Bpermanentmagnetswithhighcoercivity.Themagneticpropertiesandmicrostructureofmagnetsweresystematicallystudied.Thecoercivityandremanenceofgrainboundarydiffusionmagnetareimprovedby112%andreducedby26%comparedwiththoseoftheoriginalmagnet,respectively.Meanwhile,boththeremanencetemperaturecoefficient(α)andthecoercivitytemperaturecoefficient(β)ofthemagnetsareimprovedafterdiffusiontreatment.MicrostructureshowsthatTbelementenrichesinthesurfaceregionofNd_2Fe_(14)Bgrainsandisexpectedtoexistas(Nd,Tb)_2Fe_(14)Bphase.Thus,themagneto-crystallineanisotropyfieldofthemagnetimprovesremarkably.Asaresult,thesinteredNd-FeBmagnetsbygrainboundarydiffusionwithTbH_3nanoparticlesexhibitenhancedcoercivity.

简介：Bi3.15Nd0.85Ti3O12(BNT)粉末和薄电影被金属准备器官的分解(现代派)方法。BNT粉末的热流动曲线与调制温度被测量微分扫描热量计，和象热传导性系数和热散开系数那样的热物理参数从热流动曲线被获得。BNT薄电影的阶段鉴定，铁电体，和压电的性质在700点退火了

简介：Mechanicalalloying(MA)andsubsequentsolidsinteringprocesswasusedtopreparetheNd-containingmagnetostrictiveTb0.4Nd0.6(Fe0.8Co0.2)1.90alloy.Thestructure,thermalstabilityandphasetransformationwereinvestigatedasfunctionsofcomposition,millingprocessandannealingtemperature.Anamorphousphasewasformedbyhigh-energyballmillingfor5hwiththeball-to-powderweightratioof20:1,whichcrystallizedintoMgCu2-typeandPuNi3-typecrystallinestructurewithdifferentannealingte...

简介：采用计时电位、SEM、XRD、EIS和Tafel等方法对比研究Pb-Ag-Nd合金在160g/LH2SO4溶液中的脉冲电流极化和恒电流极化过程中的氧化膜和析氧行为。研究结果表明：脉冲电流极化的Pb-Ag-Nd合金表面的氧化膜孔洞更少,膜层更致密。这是由于在脉冲电流极化过程中的低电流阶段析氧反应更缓和,有利于多孔氧化膜的修复,因此低电流阶段可作为氧化膜的＂修复期＂。Pb-Ag-Nd阳极在脉冲电流极化过程中表现出更低的阳极电位,这与脉冲电流极化过程中阳极更小的传荷阻抗和高过电位区间更小的Tafel斜率相对应。更低的阳�