简介：Niobium,asthemosteffectivesecond-phaseformingelement,wasaddedintheFe-Cr13-C-Nhard-facingalloytogetcarbonitrideprecipitates.Morphologyandcompositionofcarbonitrideinthehardfacingalloywerestudiedbyopticalmicroscopy,scanningelectronmicroscopy,andelectronprobemicroanalyzer.Thether-modynamicsandtheeffectonthematrixoftheformationofcarbonitridewerealsodiscussed.ItwasfoundthatniobiumcarbonitridesarecomplexNb(C,N)precipitatedistributedongrainboundaryandmatrixofthehardfacingalloy.Underas-weldedcondition,primarycarbonitrideparticleswerereadilyprecipitatedfromthehardfacingalloywithlargesizeandmorphologyastheywereformedalreadyduringsolidification.Underheattreatmentcondition,alargenumberofsecondarycarbonitridescanpre-cipitateoutwithveryfinesizeandmakeagreatsecondaryhardeningeffectonthematrix.Asaresult,additionofniobiuminthehardfacingalloycanpreventtheformationofchromium-richphaseongrainboundariesandinter-granularchromiumdepletion.

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简介：Inthisstudy，adoptinguniformdesignmethodestablishedamathematicalmodeltopreparemulti-elementactiveflux.GHA\69superalloyplateswereweldedbytheNd：YAGlaserequipmentwiththepreparedactiveflux.Theresultsshowallkindsoffluxesincreasethedepthtowidthratioandthemulti-componentsystemsaremoresignificant.Thelargestincrementofthewelddepthtowidthratiois159%,obtainedbyusingoftheFI2seriesflux.Itisprovedthatbyusingoftheactivefluxtoincreasethedepthtowidthratioofmicrolaserweldingisfeasible.

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简介：以二不同纯净的Zr开始，基于Ti的体积有Ti40Zr25Cu12Ni320被准备。在形成合金的能力(GFA)的玻璃上的0.2at.%，0.4at.%，0.5at.%，0.6at.%，和1at.%的层次的钇的增加的效果借助于金属组织学，X光检查衍射，和微分扫描热量测定被调查了。试验性的数据显示高杂质内容戏剧性地减少形成能力的玻璃。有0.5at.%Y的Microalloying在压制水晶的阶段形成并且在低纯净的合金减轻氧的有害效果是有效的。相反在包含高纯净的元素的合金，有效的钇增加是不到0.4at.%。结果显示最佳掺杂物的有益的效果主要由于清除是经由无害的阶段的形成的氧杂质。

简介：TheenergymodelwasfoundedtocalculatethecriticalpowerofkeyholeformationbyusingthelimitprincipleinCW(continuouswave)Nd:YAGlaserdeeppenetrationweldingprocess.Themodelwasvalidatedbyexperiments.Theresultsshowthattherearetwoerrorsbetweenthecalculatedcriticalpowerofkeyholeformationandthatofexperiments:oneisthatthecalculatedresultsislessthanthoseofexperiments,whichiscausedbynotconsideringtheenergylossby!heatconductioninthemodelofkeyholeformation.Theotheristhatthereis0/9mmerrorbetweentheaxisofthecalculatedcurveofcriticalpowerwithlocationoflaserfocusandthatofexperimentalcurve,whichisinducedbytheexcursionoflaserfocusinlaserdeeppenetrationwelding.Atlast,thetwoerrorswererevisedaccordingtotheanalysesoftheerrors.

简介：OnthebasisOftheYoung-LaplaceEquationthatdescribesthepressuredifferencebetweeneachsideofacurvedliquidsurface,astaticequilibriummodelisestablishedtodescribethesurfaceshapeoftheweldbead.Thegeo-metricalmodelforthemoltenpoolisincluded,whichisessentialtoexplaintheundercutphenomenonduringhighspeedbead-on-platewelding.Theresultsgotfromaniterationalgorithmshowthatitistheforcebalanceontheliquidmixtureofthedepositedmetalandthedepositedmetalandthemoltenbasemetalandthemoltenbasemetalthatcausestheundercut.Somefactorsandtheireffectsarealsoana-lyzed.

简介：Ti47Cu38xZr7.5Fe2.5Sn2Si1Ag2Nbx(x?=?0，1，2；at%)体积有优异简历腐蚀抵抗的金属性的眼镜(BMG)被铜模子扔综合。尽管到Ti-Cu-Zr-Fe-Sn-Si-AgBMG的Nb的次要的增加稍微减少形成眼镜的能力(GFA)，忍受Nb基于Ti的合金能是在体积的casted有直到3的直径的玻璃质的杆形式?公里。有Nb的Cu的部分替换在提高基于Ti的BMG的简历腐蚀抵抗上是有效的，这被发现。Potentiodynamic极化大小证明基于Ti的BMG的Nb增加导致更高开电路的潜力和pitting潜力以及更低的被动电流在丝等的密度答案。电气化学的阻抗光谱学(EIS)结果显示与Nb内容增加，基于Ti的BMG的费用转移电阻价值变得更大，证明表面氧化物电影是更保护的。忍受Nb基于Ti的BMG也展出在比得上Ti-6Al-4V的vitrobiocompatibility好合金。提高的简历腐蚀电阻，在vitro优秀biocompatibility和忍受Nb基于Ti的BMG的好机械性质为生物医学的应用是有利的。

简介：Theeffectsofisothermalholdingprocessonthemicrostructureevolutionofsemi-solid7075strengthaluminumalloyproducedbytherecrystallisationandpartialremelting(RAP)processwereinvestigated.Tensilemechanicalpropertiesofas-receivedandthixoformedalloysatroomtemperaturewereexamined.Theresultsshowthatthemicrostructureofas-receivedalloyexhibitsremarkableorientationalongthedeformationdirection.Withtheincreaseofisothermalholdingtime,thesolidparticlegrainsizecontinuouslyincreasesandthedegreeofspheroidizationalsoimproves.Coalescencemechanismisdominantwhenreheatedat595°CandOstwaldripeningmechanismisdominantwhenreheatedat615°Cinthesemi-solidstate.Alowercoarseningrateisobservedfor615°C(coarseningrateK=391μm3s-1)comparedwiththecoarseningratefor595°C(coarseningrateK=501μm3s-1).TheRAP7075aluminumalloycanbesuccessfullythixoformedandthefillingofcomponentsisgoodafterthixoforming.Thethixoformedcomponentsexhibitfavoritemechanicalproperties.

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简介：CaTiO3的形成行为在钛铁矿的electro-deoxidization期间专注准备FeTi合金被实验和模拟调查。结果显示中间的产品的形成和分解，CaTiO3,在钛铁矿的electro-deoxidization期间是不可避免的步专注。CaTiO3能在电气化学的过程期间通过熔融的盐和电气化学反应的hydrolyzation被产生。为CaTiO3的产生的主要原因在阴极是在从熔融的盐和TiO2的Ca2+之间的电气化学反应。与electro-deoxidization继续，CaTiO3是进一步的electrolyzed形成钛低值氧化物。当在由在sintering期间增加CaCO3的阴极的CaTiO3形式处理时，当前的效率能被改进。

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简介：Thesegregationanddiffusionofboronduringheattreatmentswerestudied.Theinfluenceofboroncontents,agingtimeandappliedstressonFeMo2B2formationwasalsostudied.Finally,theeffectsofboroncontentsandFeMo2B2formationonthehightemperaturestrengthwerestudied.Boronatomsweresegregatedtoprioraustenitegrainboundaryduringnormalizingtreatment.Andtheseboronatomswereslowlydiffusedintothegraininteriorduringtemperingandagingat700℃.TheFeMo2B2phasewasonlyformedafter1,000hagingat700℃inalloycontaining196ppmboron.TheformationofFeMo2B2phaseisacceleratedbytheappliedstress.ItwasexpectedthattheformationofFeMo2B2iscloselyrelatedtotheredistributionofboronatoms.Thetensilestrengthsat700℃areincreasedwiththeincreaseofboroncontents.However,theformationofFeMo2B2phaseresultsinlowertensilestrength.

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：Inthisstudy,C_f/AlcompositesandTiAlalloyswerejoinedbyanewmethodnamedlaser-ignitedselfpropagatingsynthesis(SHS).Mixedpowdersof63.0Ni-31.9Al-5.1Ti(wt%)wereusedasjoininginterlayer.Perfectjointwasgot.ThemicrostructureevolutionandformationmechanismoftheSHSjointwereinvestigatedbyscanningelectronmicroscopy(SEM),energy-dispersivespectroscopy(EDS)andX-raydiffraction(XRD).Resultsshowthatlocalizedmeltingoccursonbothsides.Oneγ-Ni_(0.35)Al_(0.30)Ti_(0.35)andtwoNi-Alreactionlayersform,respectively,intheTiAl/interlayerandC_f/Al/interlayerinterfaces.ThecombustionofNi-Al-TiinterlayerbeginswiththesharpreactionofNiandAl.TheinterlayerproductisaeutecticorganizationofNiAlandAl-richγ.