简介：AmedicalcastCoCrMoalloywascoatedbyplasmanitridingprocesstoenhancethewearresistance.Themicrostructures,phasesandmicro-hardnessofnitridedlayerswereinvestigatedbyatomicforcemicroscopy(AFM),scanningelectronmicroscopy(SEM),X-raydiffraction(XRD)andmicro-hardness.Tribologicalpropertieswereinvestigatedonapin-on-discweartesterunder25%bovineserumsolutions.Theexperimentalresultsshowedthatplasmanitridingwasapromisingprocesstoproducethick,hardandwearresistantlayersonthesurfaceofCoCrMoalloy.TheharderCrNandCr2Nphasesformedontheplasmanitridedlayerwiththecompactnano-crystallinestructure.Comparedwiththeuntreatedsample,allnitridedsamplesshowedthelowerwearratesandhigherwearresistanceatdifferentappliedloadsandnitridingtemperatures.Itwasconcludedthattheimprovementofwearresistancecouldbeascribedtotheformationofthickerandhardernitridedlayerswiththespecificmicrostructuresonnitridedsurfaces.

简介：ThebasestructureofinsituTiCP/Fecompositesfabricatedunderindustrialconditionwaschangedbydifferentheattreatments.Erosiveweartestswerecarriedoutandtheresultswerecomparedwiththatofwear-resistantwhitecastiron.TheresultssuggestthatthewearresistanceoftheinsituTiCp/Fecompositeishigherthanthatofwear-resistantwhitecastironunderthesanderosivewearcondition.Thewearmechanismofthewear-resistantwhitecastironwasacycleprocessthatbasesurfacewaswornandcarbideswereexposed,thencarbideswasbrokenandwearpitsappeared.WhilethewearmechanismofinsituTiCp/FecompositewasacycleprocessthatbasesurfacewaswornandTiCgrainswereexposedanddropped.ThewearresistanceofinsituTiCp/Fecompositewaslowerthanthatofwear-resistantwhitecastironundertheslurryerosivewearcondition.Undersuchcircumstance,thematerialwasnotonlyundergoneerosivewearbutalsoelectrochemistryerosionduetothecontactwithwaterinthemedium.Thewearbehaviourscanbeacombinationoftwokindsofwearandthesanderosivewearisworsethanslurryerosivewear.

简介：Theadvancedfabricationofin-situdendrite/metallicglassmatrix（MGM）compositesisreviewed.Herein,thesemisolidprocessingandBridgmansolidificationaretwomethods,whichcanmakethedendriteshomogeneouslydispersedwithinthemetallicglassmatrix.Uponquasi-staticcompressiveloadingatroomtemperature,almostallthein-situcompositesexhibitimprovedplasticity,duetotheeffectiveblocktothefastpropagationofshearbands.Uponquasi-statictensileloadingatroomtemperature,althoughthecompositespossesstensileductility,theinhomogeneousdeformationandassociatedsofteningdominates.Highvolume-fractioneddendritesandnetworkstructuresmakein-situcompositesdistinguishinglyplasticupondynamiccompression.In-situcompositeexhibitshightensilestrengthandsoftening（necking）inthesupercooledliquidregion,sincethepresenceofhighvolume-fractioneddendriteslowerstherheologyoftheviscousglassmatrixathightemperatures.Atcryogenictemperatures,adistinguishingly-increasedmaximumstrengthisavailable;however,aductile-to-brittletransitionseemstobepresentbyloweringthetemperature.Besides,improvedtension—tensionfatiguelimitof473MPaandfour-point-bendingfatiguelimitof567MPaaregainedforZr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0MGMcomposites.Highvolume-fractiondendriteswithintheglassmatrixinduceincreasedeffectivenessonthebluntingandpropagatingresistanceofthefatigue-cracktip.Thefracturetoughnessofin-situcompositesiscomparabletothoseofthetougheststeelsandcrystallineTialloys.Duringsteady-statecrack-growth,theconfinementofdamagebyin-situdendritesresultsinenhancementofthetoughness.

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简介：Thedevelopmentofthermalanalysistechniquesforevaluationofcastalloymeltqualityanditscurrentapplicationsinthefoundrywerereviewed.Thecharacteristicsofthecurrentthermalanalysistechniqueswereanalyzed.Anewcomprehensivemethodforcoolingcurverecognitionhasbeenproposed.Theevaluationofcastalloymeltqualitywasrealized.

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：LowfieldNMRtechniquewasappliedtoinvestigatethehydrationofcementpasteswithdifferentwatertocementratiosoradditionofsuperplasticizer.Asanondestructivemethod,thistechniquecanbeusedtomonitorthehydrationkineticsprocessbyfollowingthechangesoflongitudinalrelaxationtime(T1)ofwaterconstrainedinthepastes.TheexperimentalresultsindicatethattheT1distributionsofwaterinthefreshpastenormallyexhibitebimodaldistribution,wherethelargepeakiscorrespondingtothefreewaterwhilethesmalloneiscontributedbythewaterstoredintheflocculations.TimedependenceoftheweightedaverageT1hasagoodagreementwiththehydrationprocessandcouldbedividedintofourstages,ie,initialperiod,dormantperiod,acceleratedperiodandsteadyperiod.Thehydrationmechanismofeachstagewasdescribedbasedonthetheoryofcementchemistry.Inaddition,thetotalsignalintensity,whichisproportionaltothecontentofthephysicallyboundwaterinthesamples,decreasesuccessivelyduringthehydrationreflectingtheconsumptionofphysicallyboundwaterbyhydrationreactions.

简介：磨擦促使处理(FSP)，FSW的一个变化(磨擦促使焊接)能局部地消除的一种新兴的表面工程技术正在扔缺点和精制微观结构，从而改进material.FSP的机械性质能也通过厚度生产有细密纹理的微观结构给予技术包含跳入很快旋转的superplasticity.The，非可消费的工具，包括一根介绍大头针和更大的直径肩膀，进表面然后越过表面穿越工具。大头针和肩膀磨擦加热在从而改进机械性质的处理区域改变谷物结构的表面。这篇论文在微观结构和渗出的演员组的机械性质上论述FSP的效果2285铝合金在三不同喂率viz.10,12和15mm/min.Withfeed速度的增加材料被观察增加了也增加的impactstrength.FSP张力并且有坚硬和韧性价值的增加的收益力量另外。观察详细被列出了并且图片地代表了。

简介：位于加拿大温哥华的IBC先进合金公司与伦敦德里的Nu—Cast企业签署了一个无约束理解备忘录（MOU），旨在合作投资航空用铍铝合金铸造件的生产。备忘录描诉了提高IBC现有铍铝合金近终成形的生产产能和生产率的合作框架，双方将通过节约成本及提高物流效率来增加IBC铸造件的市场占有率。

简介：Liquidcompositemoulding(LCM)processesareusedtomanufacturehighqualityandcomplex-shapedcompositepartsintheautomotive,marine,aerospaceandcivilindustries.On-linesensingplaysanimportantroleincontrollingthequalityofthefinalproductintheLCMmanufacturingenvironment.Thelong-periodfibergrating(LPG)technology,anewreal-timefiberopticsensorsystem,wasdevelopedtomonitortheflowfrontprogression.Thesensoroperationandcharacterizationundervariousprocessconditionswerediscussedindetail.TheexperimentalresultsshowedthatLPGsensorswererobustandreliabletodetectthearrivalofresinatpre-selectedlocationsinstructureswithlow-mediumfibervolumefraction;howeverwerelimitedatdifferentdepthsinstructureswithhighfibervolumefraction.

简介：因为他们联合了木头和无机的混合物的优点，混合木头材料吸引了可观的注意。这个工作调查了微结构形态学，热稳定性，紫外(紫外)用wood/ZnO混血儿材料做通过的composites的稳定性，和抗菌剂性质一灵巧在原处化学合成方法。X光检查衍射(XRD)和thermogravimetric分析(TGA)结果显示综合ZnO粒子有大约10.8nm的一种平均谷物尺寸。扫描电子显微镜学(SEM)观察证明与nanosheets自我装配的ZnOnanoflowers在木头房间腔被介绍并且与增加Zn2+集中增加了。ZnOnanoparticles也在木头房间墙中被产生，它被精力散的光谱学(版本)的结果证实。TGA测试也显示wood/ZnO混血儿材料的热稳定性在ZnO无机的粒子的形成以后被改进。最后，抗菌剂功效测试的结果和紫外抵抗测试表明ZnOnanoparticles对Escherichiacoli作为抗菌剂代理人显示出有希望的未来(E。coli)并且为木头保护的紫外抵抗代理人。

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简介：Toobtainthecompatiblematerialofhighhardnessandhightoughness,Hadfieldsteelmatrixcomposites,reinforcedbyhigh-Crcastironbarsmadeofflux-coredweldingwires,whichwereinsertedintotheHadfieldsteelmelt,wereinvestigated.Themechanicalpropertiesofthreematerials,ie,compositesforas-castandquenching-watercondition,aswellasHadfieldsteel,werecompared.Theresultsshowthatthealloypowderinsideflux-coredweldingwirescanbemeltedbytheheatcapacityofHadfieldsteelmeltandsolidifyintohigh-Crcastironbars.Theimpacttoughnessofthecompositeforquenching-waterconditionishigherthanthatofthecompositeforas-castconditionandislowerthanthatoftheHadfieldsteel,butitcanstillmeettherequirementsofhardnessandtoughnessinindustrialapplication.Regardlessofloadvariation,compositeforquenching-waterconditionshowsbetterwearresistancethanthoseofthecompositeforas-castconditionandHadfieldsteel.ThemodifiedfracturetoughnessandwearresistanceofcompositesareattributedtonotonlythecombiningactionsofHadfieldsteelmatrixandhigh-Crcastironbars,butalsotheeffectofheattreatment.

简介：当演员组Mn18Cr18N奥氏体的不锈钢的热变丑行为在950-1200的温度范围被学习??吠???嘴????????????????????????眱吗？？

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简介：Thispaperreportstheeffectoffrictionstirwelding(FSW)processparametersontensilestrengthofcastLM6aluminiumalloy.Jointsweremadebyusingdierentcombinationsoftoolrotationspeed,weldingspeedandaxialforceeachatfourlevels.Thequalityofweldzonewasinvestigatedusingmacrostructureandmicrostructureanalysis.Tensilestrengthofthejointswereevaluatedandcorrelatedwiththeweldzonehardnessandmicrostructure.Thejointfabricatedusingarotationalspeedof900r/min,aweldingspeedof75mm/minandanaxialforceof3kNshowedsuperiortensilestrengthcomparedwithotherjoints.Thetensilestrengthandmicrohardnessoftheweldedjointsfortheoptimumconditionswere166MPaand64.8Hvrespectively.

简介：BaTiO3/PVDFnanocompositeswerepreparedviain-situgrowthofnanosizedBaTiO3particlesinPVDFmatrixbyusingthesolgelmethod.ThepresentelementsofBaTiO3/PVDFnanocompositeswereana-lyzedbyanelectronprobeX-raymicroanalyser.NanosizedBaTiO3growninthecompositefilmswascharacterizedbyanX-raydiffractometerandatransmissionelectronmicroscope,andthedielectricpropertiesofthecompositefilmsweremeasured.ThedistributionofBaTiO3nanoparticlesin-situgrowninthePVDFmatrixwasexaminedus-ingascanningelectronmicroscope.

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