简介:一些材料的weldability在这篇论文用简单精明的节目被分析,并且测试数据的weldability通过数据库系统被分享。焊接过程与专家系统的帮助被设计,并且知识在焊接工程师之中被分享。不仅焊接文件的准备进步根据现在的过程资格记录(PQR)在资格测试的必要性上与数据库系统而且复杂决定被完成,制造代码被做。而且,当有足够的测试数据训练模型时,人工的神经网络(ANN)技术被证明是预言焊接关节的机械性质的有效方法之一。最后,在为焊接关节的微观结构建模的成就被介绍,特别在固体在影响热的地区(HAZ)和焊接熔融的水池的转变和谷物生长。
简介:Basedonsoundabsorptionmechanismofmaterial,thespecialsoundabsorptionmaterialCEMCOMforroadsoundinsulationisintroduced.Thishighsoundabsorptionmaterialismainlycomposedofexpandedperlite.Usingmultiplesoundabsorptionstructurecanimprovesoundabsorptionpropertyofmaterial.Accordingtothepreparationprincipleanddurabilitydesignofmaterial,anewkindofmaterialwithlowcostandhighdurabilityisdeveloped.
简介:NiOOHnanosheet/graphenehydrogels(HNiOOH/GS),withmesoporousNiOOHnanosheetsuniformlydispersedwithinthehighlyin-terconnected3Dgraphenenetwork,areconstruct-edandstudiedforthefirsttimebyamixedsolvo-thermalandhydrothermalreaction.Theeffectofsol-ventcompositiononthemorphology,phase,anddispersibilityofnanocrystalandhydrogelstrengthis
简介:NiTialloyisproducedbymechanicalalloying(MA).Itbecomesamorphousaftermillingforenoughtime,suchas100hinthispaper.DSCmeasurementshowsthatthecrystallizationtemperatureis676Kfortheamorphouspowder.Activationenergyofcrystallizationis199.98kJ/molforMApowder,whichislowerthanthatofamorphouspreparedbymagnetronsputtering.Avramiparameterofcrystallizationis1.07.
简介:Fromtheprocessofsedimentationthemathematicalrelationshipsamongdepositionvolumeandpowderpropertiesaswellassedimentationparameterswerededuced.Basedontheformulaamathematicalmodelwassetupandsimulatedthroughthecomputer.AtlastthevalidityofmathematicalmodelwassupportedbytherepresentativeexperimentonTi-MosystemFGMpreparedbyco-sedimentation.
简介:Anewconceptfordevelopmentofmetallicbiomaterialsisproposedinthisarticle,i.e.,acertainbio-functioncanberealizedforametalimplantthroughcontinuousreleaseofadesignedbio-functionalmetalelementfromsurfaceofthemetalimplantinthebodyenvironment.ThiscreativeideahasbeenverifiedtobepossiblebyseveraldifferentinvitroandinvivoexperimentalevidencesontheCu-bearingstainlesssteelsandmagnesiumbasedmetals.ItwasindicatedthatatraceamountofCureleasefromtheCu-bearingsteelscouldhaveobviousbio-functionsofreductionofthein-stentrestenosis(ISR),anti-bacterialinfection,inhibitingtheinflammatorycellsandevenpromotingtheearlyosteogenesis.Furthermore,thedegradationofmagnesiumbasedmetalsinbonescouldpromotethenewboneformation,enhancethebonemineraldensityfortheosteoporosismodeledanimal,andevenhavestronganti-bacterialabilityandstrongcytotoxicitytobonetumorcellsduetotheenhancementofpH.Specialbio-functionwithsatisfiedload-bearingcapacityformetallicbiomaterialswillbringhigherapplicationvaluesfortheimplantmadeofthisnovelmaterial.Thisisanattractivedirectionforresearchanddevelopmentwithmanychallenges,butthefinalsuccesswillbemuchbeneficialtothemajorityofpatients.
简介:由使用焊接电线的镍,焊接弧的以铁酸盐为主要成的可锻的铁的部分熔化地区(PFZ)和焊接金属的机械性质的寒心的趋势上的alloying的效果系统地被学习了。在这个基础上,为以铁酸盐为主要成的可锻的铁(QT400-17)的弧焊的一个新镍电极第一次被开发。它的焊接金属的机械性质能以铁酸盐为主要成的可锻的铁匹配那些。在PFZ的碳化物层(WCL)的宽度显著地被减少,焊接关节有优秀马赫无能,焊接金属有高热的抗碎裂性。(编辑作者摘要)3个裁判员。
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简介:Ag-TiAlintermetallicalloy,Tie45Ale2Nbe2Mn(at.%)e0.8vol.%TiB2,hasbeenprocessedfromgasatomizedprealloyedpowderbyfieldassistedhotpressing(FAHP).Aninitialanalysisoftheprealloyedpowderhelpedontheunderstandingoftheintermetallicsinteringbehavior.Atomizedpowderconsistedofametastablephasethattransformedintoa2tgequilibriumphasesbythermaltreating.Differentpowderparticlemicrostructureswerefound,whichinfluencethemicrostructuredevelopmentoftheFAHPg-TiAlmaterialdependingonthesinteringtemperature.Duplex,nearlylamellarandfullylamellarmicrostructureswereobtainedatthesinteringtemperaturesabove1000C.Lowerconsolidationtemperatures,below1000C,ledtotheformationofanAlrichphaseatpowderparticleboundaries,whichisdeleterioustothemechanicalproperties.Highcompressiveyieldstrengthof1050MPawasobservedinsampleswithFAHPduplexmicrostructuresatroomtemperature.Whereasnearlylamellarandfullylamellarmicrostructuresshowedyieldstrengthvaluesof655and626MPaatroomtemperatureand440and425MPaat750C,respectively,whicharesuperiorincomparisontosimilaralloysprocessedbyothertechniques.Theseexcellentpropertiescanbeexplainedduetothedifferentvolumefractionsofthea2andgphasesandtherefinementofthePMmicrostructures.