简介:ThesubmicronpowdermixturesofTiC-TiN-WC-Mo-C-Nisinteredat1400℃orbelowinvacuumwerestudiedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM)analyses.TheresultsshowedthatMo2Cformedat800℃orbelow.BothWCandMo2Cdisappearedat1200℃,andTiNdisappearedat1250℃.Inaddition,thevariationsoflatticeconstantsofthetitaniumcarbonitrideandnickelbinderphasewithsinteringtemperaturewereexperimentallyobtained,andthereasonwasanalyzed.
简介:晶体结构和加氢行为(La_(1-x)Mg_x)_3Al(x=0.1,0.2,0.3,和0.4)合金被调查。这被发现有x=的合金0.1La和第0.2consi(Mg,艾尔),La,和一个新奇阶段。新奇阶段作为La_2Al被决定。当Mg满足增加,La_2Al的数量减少,这被显示出。当x增加到0.3时,onlyLa(Mg,艾尔)并且La_2Al的小数量存在。当x是0.4时,La_2Al阶段消失,合金包含两La(Mg,艾尔)并且La(艾尔,Mg)_2洗阶段。(La_(0.9)Mg_(0.1))_3Al并且(La_(0.7)Mg_(0.3))_3Al合金能被氢的吸收在473K分解成LaH_3,MgH_2,和La_2Al_5。
简介:用于有机化合物的抽取的稳固阶段的抽取(SPE)技术有创作力地在纸被用作无机的黄金的抽取。技术的二种类型被建议并且探索,也就是SPE和第四级的铵表面活化剂的liquidliquid抽取(LLE)[cetytrimethyl铵溴化物(CTMAB),cetylpyridine溴化物(CPB),本甲基dimethyldodecyl铵氯化物(BDMDAC),并且dodecyltrimethyl铵氯化物(DTMAC)]。表面活化剂能与Au(CN)2到形式,离子的建筑群,和混合物能被反向阶段的结合的硅石胶化的SPE列提取。因此,SPE的一个新方法被建议与高选择,可靠性,和简洁的这些特征提取黄金。黄金的恢复率是超过98的试验性的结果表演?%,和稳固阶段的抽取列容易没被损坏,它能反复被使用。新方法能也从碱的氰化物答案被用作黄金的抽取过程。而且,纸也提出金抽取的一个新过程。
简介:1.6公里厚的表的非合金的钛的变硬的激光转变(LTH),更近,到ASTM,等级3化学作文用2kWCWNd被调查:钇铝柘榴石激光。激光力量的效果(750-1250W),扫描速度(10003000mm/min)和焦点的点位置(从?10到?30公里)在热输入,和变硬祷告的几何学上(即变硬的祷告宽度(HBW),变硬的深度(HD)和变硬的祷告的入口的角度与表面(AEHB)介绍)用反应表面方法论(RSM)被调查。试验性的计划基于Box-Behnken设计矩阵方法。为预言热输入和变硬的祷告几何学的线性、二次的多项式方程被开发。结果显示建议模型在变硬的参数的限制以内足够地预言回答被使用。回归方程能被用来为需要的标准发现最佳变硬条件,这被建议。
简介:Inthiswork,transformationbehaviorsandmechanicalpropertiesofcold-rolledshapememoryalloyTi50Ni49Fe1bysevereplasticdeformation(SPD)wereintensivelyinvestigated.Thephasetransformationbehaviors,phaseanalysis,andmicrostructureswerecharacterizedbydifferentialscanningcalorimetry(DSC),X-raydiffraction(XRD),andtransmissionelectronmicroscopy(TEM),respectively.TensiletestingwasperformedtoanalyzetheeffectofSPDonthemechanicalpropertiesandshapememoryofTi50Ni49Fe1alloy.Whenthethicknessreductionisbeyond30%,themartensitictransformationissuppressed.Aftercold-rolling,thealloyismainlycomposedofB2parentphaseswithsomestress-inducedmartensiticB190phases,andhighdensityofdislocationsaregeneratedandthegrainsareobviouslyrefined.Theyieldstressrbsignificantlyraisesfrom618MPaof0%coldrollingto1,338MPaof50%SPD.Shape-memoryeffectincreasesfrom6.5%withoutcoldrollingto8.5%after30%SPD,ascribedtotheinduceddefectsincoldrolling.ThoseresultsindicatethatTi50Ni49Fe1alloyhasimprovedmechanicalpropertiesandpotentialcommercialapplicationsafterSPD.
简介:Thesegregationanddiffusionofboronduringheattreatmentswerestudied.Theinfluenceofboroncontents,agingtimeandappliedstressonFeMo2B2formationwasalsostudied.Finally,theeffectsofboroncontentsandFeMo2B2formationonthehightemperaturestrengthwerestudied.Boronatomsweresegregatedtoprioraustenitegrainboundaryduringnormalizingtreatment.Andtheseboronatomswereslowlydiffusedintothegraininteriorduringtemperingandagingat700℃.TheFeMo2B2phasewasonlyformedafter1,000hagingat700℃inalloycontaining196ppmboron.TheformationofFeMo2B2phaseisacceleratedbytheappliedstress.ItwasexpectedthattheformationofFeMo2B2iscloselyrelatedtotheredistributionofboronatoms.Thetensilestrengthsat700℃areincreasedwiththeincreaseofboroncontents.However,theformationofFeMo2B2phaseresultsinlowertensilestrength.
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:TheprecipitatingkineticsofNi75Al17Zn8alloywasstudiedatboth873Kand973Kbymicroscopicphase-fieldmodel.Thecalculationresultsshowthattheorder-disordertransformationexperiencesthematrix→lowly-orderedL10phase→L12phaseat973K.AndthenucleationofL12particlesbelongstothespinodaldecompositionmechanism.Astemperatureincreases,orderingsofAlandZnatomsareresisted,butcoarseningofL12particlesispromoted.Thevalueofcoarseningkineticexponentsapproachesto1/2.Inaddition,thediscussionsaboutNi-Alanti-sitedefectandZnsubstitutionsforNisiteandAlsiteexhibitthatthehigherthetemperature,themoredistinctivetheNi-Alanti-sitedefect,butthelesstheZnsubstitution.
简介:为在水样品的踪迹水银的分析的一个新方法被开发,基于用象由冷蒸汽的稳固的阶段提炼之物和决心的修改dithizone的纳米钛二氧化物(TiO2)的preconcentration/separation的联合原子吸附spectrometry(CVAAS)。Dithizone与酒精被溶解并且在缩放nano的TiO2粉末的表面上装载了由激动人心。修改dithizone的nanoparticles上的Hg2+的静态的吸附行为详细被调查。为Hg2+的优秀吸附比率能与15min,和3.5摩尔的5mL的一摆动时间在78的pH范围被获得,这被发现
简介:TheeffectsoftheintroductionofCetoLa_(1-x)Ce_xFe_(11.5)Si_(1.5)alloyson1:13phaseformationmechanism,thefirst-ordermagneticphasetransitionstrengtheningcharacteristics,andmagnetocaloricpropertywerestudied,respectively.Theresultsshowthattheformationmechanismsof1:13andLaFeSiphasesinLa_(1-x)Ce_xFe_(11.5)Si_(1.5)alloysarethesameasthoseofCe_2Fe_(17)andCeFe_2phasesinCe–Febinarysystem,respectively.ThesubstitutionofCein1:13phasewhichislimitedcanmakethefirst-ordermagneticphasetransitioncharacteristicsstrengthen,whichcanmakethermalandmagnetichysteresisincrease,thetemperatureintervaloftemperatureinducedphasetransitiondecrease,andthecriticalmagneticfieldoffield-inducedmagneticphasetransition(HC)increase,respectively.Owingtothelatticeshrinkof1:13phasewiththeincreaseinCecontent,theCurietemperatures(TC)showalineardecrease.Themaximumchangeinmagneticentropygraduallyincreasesduetothedecreaseintemperatureintervaloftemperature-inducedphasetransition,buttherelativecoolingcapacitiesareallabout80Jákg-1atmagneticfieldof2T.
简介:Basedonclustervariationmethod(CVM)andnaturaliterationmethod(NIM),order-disorderphasetransitionintheintercalationcompoundsM1/2TiS2issimulatedbycomputer.Thefavorableconditions,underwhich3a0×a0superstructureisformed,aregiven,andtheresultsareingoodagreementwiththeexperimentsandtheoreticalcalculations.TherelationshipbetweencriticaltemperatureandM-ion-vacancyinteractionparameterislinear.
简介:TheeffectsofheattreatmentsonthephasetransformationbehaviorofTi49Ni49.5Fe1V0.5andTi48Ni48.5Fe1V2.5alloyswereinvestigated.TheresultsindicatethatthealloyssubjectedtodifferentheattreatmentshaveB2structureatroomtemperature.AllthespecimensexhibitatwostageB2→R→B190martensitictransformationoncooling,butaB190→B2one-stagereversemartensitictransformationonheatingexceptagedA1alloy,whichundergoesanabnormaltwo-stagetransformationuponheating.ThephasetransformationtemperaturesareaffectedbyheattreatmentsandVcontent,whichcanbeattributedtothevariationofthesecond-phaseparticlescontentinthematrix.