简介：TheinteractionbetweenZn-AleutecticalloyandAl2O3p/6061Alcompositesinthevacuumfurnacewasinvestigated.Greatattentionhasbeenpaidtotheelementsdiffusion,themicrostructureandformationoftheinterfacebetweenZn-AIeutecticalloyandAl2O3p/6061Alcomposites.ExperimentalresultsshowthatZn-AleutecticalloyhasagoodwettingabilitytoAl2O3p/6061Alcompositesandthewettingangledecreaseswithincreasingthetemperatureinvacuum.Aftertheinteraction,aninteractionlayerformsbetweenZn-AIalloyandAl2O3p/6061Alcomposites.Thephasesintheinteractionlayermainlyconsistofα-Al(Zn),Al2O3andCuZn5resultedfromthediffusionofelementsfromtheZn-Alalloy.SeveralporositiesdistributeintheregionneartheinterfaceoftheZn-Alalloy/interactionlayer.TheamountofshrinkagevoidsintheinteractinglayerisrelevanttothepenetrationofZnelementintoAl2O3p/6061Alcompositeswhichisafunctionoftemperature.SoitisnecessarytolowerheatingtemperatureinordertolimittheZnpenetration.

简介：AresearchonkineticsofAlevaporationfromliquidU—Alalloyswasmadeinavacuuminductionmelting（VIM）furnaceat1673—1843K.TheevaporationrateofAlwasfoundtobefirstorderwithrespecttoAlcontentinthemelt.TheoverallmasstransfercoefficientofAlwasdeterminedanditwasfoundthattheevaporationrateofAlincreasedwithincreasingtemperatures.TheapparentactivationenergyofAlevaporationat1673-1843Kwas171.5kJmol-1.ThevalueofmasstransfercoefficientofAlintheliquidphasewasestimatedtobe3.77×10-6,7.41×10-6,and9.40×10-6ms-1at1673,1753,and1843K,respectively.Meanwhile,ratedeterminingstepswerediscussedanditwasconcludedthattheevaporationrateofAlismainlycontrolledbyliquidphasemasstransfer.

简介：我们集中于与Ni-Al金属间化合的混合物扔合金由的ligth重量的表面加强在原处改进非铁的扔的表面性质的燃烧反应部件。在我们的以前的工作，元素的Ni和艾尔粉末紧缩的绿色被SHS(自我繁殖的高温度合成)反应到形式Ni3Al金属间化合的化合物有熔融的艾尔合金并且同时的热的反应与艾尔扔结合了合金。但是象微小的裂缝和孔那样的一些缺点在反应协议被仍然是。我们因此使用了压力阻止热裂缝并且与液体艾尔合金充满毛孔由压榨扔过程。压缩艾尔合金与Ni3Al金属间化合的混合物结合了是sectioned并且由光显微镜学和扫描电子显微镜学(SEM)观察了。在结合的接口附近并且在反应协议形成的intermetallics的stoichiometric作文被散光谱学(版本)和电子探查的精力识别微分析(EPMA).Si富人层被艾尔的顺序的团结在结合的接口附近在艾尔合金方面上形成合金。在反应Ni3Al协议观察的孔与液体艾尔合金被充满。从熔融的艾尔合金的Si粒子在反应Ni3Al金属间化合的协议的毛孔被检测。扔合金和Ni3Al金属间化合的化合物的艾尔被把压力用于液体艾尔合金很很熟加入。

简介：ItwasshownbyTEMandX-rayanalysisthatNi3AlisthemainphaseoftheintermetallicsynthesizedundercompressionfromthepowdermixtureofNiwithAlalloyedbyB.TheNi3Bisasecondaryphase.ThevalueofthelatticeparameteroftheintermetallicNi3AlwithandwithoutBincreaseswhentheconcentrationofAlincreases.TheincreaseinAlconcentrationfrom23.5to25.0intheinitialpowdermixtureleadstodecreasingthesolubilityofBintheNi3Alphase.

简介：Al2O3/Al的三个系列把陶器的矩阵composites，命名矿泉，SPV和HP压成薄片，被不同方法制作。矿泉和SPV经由屏幕在空或真空中打印和随后的热处理用Al2O3片和艾尔泥浆被准备。HP样品被热压成为艾尔陪衬和Al2O3片的分层的栈。SEM和XRD被使用分析微观结构和夹层水晶阶段。弯曲力量，破裂坚韧和三个方法做的样品的破裂工作被测量并且比较。结果证明composites比Al2O3片有好一些的坚韧和更高的破裂工作。在三个方法做的样品之中，热压做的样品有最佳机械性能。排水量负担曲线和骨折机制被分析。

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简介：TheweldabilityofSiCw/6061Alwasinvestigated.Fromtheresultsofexperiments,itisfoundthatthestrengthofjointismainlyinfluencedbyweldingtemperature,andhighstrengthofjointisobtainedunderweldingtemperaturebetweenliquidusandsolidusofmatrixalloy.DiffusionweldingofSiCw/6061.Alwassuccessfullyrealizedwithappropriateweldingparameters.

简介：Al-pillaredinterlayeredmontmorillonite(Al-PILM)waspreparedusingtheartificialNa-montmorillonitefromtheQingfengshanbentonitemineasastartingmaterialmixedwithAl-pillaringsolutions.ThemicrostructureofthematerialswasstndiedbyanX-raypowderdiffractometerandaFouriertransforminfrared(FTIR)spectrometer.Theresultsindicatedthatthebasalspacing[d(001)value]ofthematerialswasincreasedsignificantlyto1.9194nmrelativetoNa-montmorillonite(1.2182nm).Aftercalcinedfor2hat300℃,thebasalspacingwasstabilizedat1.8394nmandthelayeredstructureofthematerialswasnotdestroyed.Thermalanalysiswasconductedbyathermalgravimetryanddifferentialthermalanalysis(TG-DTA)instrument,itshowedthatAl-PILMlostphysicallyadsorbedwaterbelow230.6℃andwaterformedbydehydroxylationofthepillarsataround497.1℃,withapeakofthephasetransformationat903.0℃.

简介：AdditionofAl-5Ti-1Balloytomoltenaluminumalloyscanrefineα-Algrainseffectivelyandtherebyimprovetheirstrengthandtoughness.TiAl3andTiB2inAl-5Ti-1Balloyarethemainsecondary-phaseparticlesforrefinement,whiletheunderstandingontheeffectoftheirsizesonα-Algrainrefinementcontinuestobefragmented.Therefore,Al-5Ti-1Balloyswithvarioussizesandmorphologiesofthesecondary-phaseparticleswerepreparedbyequalchannelangularpressing(ECAP).Evolutionofthesecondary-phaseparticlesduringECAPprocessandtheirimpactonα-AlgrainrefinementwerestudiedbyX-raydiffractionandscanningelectronmicroscope(SEM).ResultsshowthatduringtheECAPprocess,micro-cracksfirstlyappearedinsideTiAl3particlesandthengraduallyexpanded,whichresultedincontinuousrefinementofTiAl3particles.Inaddition,micro-distributionuniformityofTiB2particleswasimprovedduetotheimpingementofTiAl3particlestoTiB2clustersduringdeformation.ExcessivelylargesizesofTiAl3particleswouldreducethenumberofeffectiveheterogeneousnucleusandthusresultedinpoorgrainrefinementeffectiveness.Moreover,excessivelysmallTiAl3particleswouldreduceinhibitoryfactorsforgraingrowthQandweakengrainrefinementeffectiveness.Therefore,anoptimalsizerangeof18-22μmforTiAl3particleswassuggested.

简介：有在2～6的范围的厚度的极端薄铝电影0nm被dc磁控管劈啪作响扔了仪器。获得的样品的反射和发射度与一个WFZ-900-D4UV/VIS分光光度计被测量。光常数(n，k)并且介电常数(ε'，ε')被使用Newton-Simpson周期性的替换决定方法。结果显示极端薄铝电影的电磁的组成的特征是厚度的功能并且有明显的尺寸效果。

简介：为了提高方镁石-尖晶石砖性能，以电熔镁砂、镁铝尖晶石、金属铝粉和板状刚玉为原料来制备方镁石-尖晶石材料。研究了金属铝粉和板状刚玉添加量对材料体积密度、显气孔率、高温抗折强度、抗热震性的影响。结果表明：随着金属铝粉加入量的增多，材料烧结性能得到提高，加入金属铝粉时材料的高温抗折强度变大，加入金属铝粉1．5％时抗热震性最好；加入板状刚玉2％时烧结性能和抗热震性最好，加入4%板状刚玉时材料的高温抗折强度最大。

简介：以两种Al2O3-Al2TiO5复合粉体为原料经SPS烧结制备出Al2O3-Al2TiO5复相陶瓷。采用纳米结构复合粉体烧结而成的复相陶瓷有着较优的力学性能，特别是具有较高的断裂韧性和硬度，与其较小的晶粒尺寸相对应。干滑动摩擦磨损试验在4N和6N法向载荷下进行，结果表明，采用微米结构复合粉体烧结而成的复相陶瓷磨损表面较光滑，体积磨损量较小。在磨损试验中，纳米结构复合粉体烧结而成的复相陶瓷的破坏方式为沿晶断裂，有明显的晶粒拔出现象；微米结构复合粉体烧结而成的复相陶瓷呈不连续的微观断裂并产生塑性变形；同时，两种材料在摩擦磨损过程中都发生接触面的氧化和物质转移。

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简介：1.IntroductionLightrareearthadditioncanremarkablyenhancetheservicelifeofFe-Cr-Alalloyforelectricalheatingelement,butitscontentinthealloymustbecontrolledbelowthelevelof0.1wt-%.Whenthecontentexceedsthat,theperformance

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简介：DiffusionofAlinthinfilmnanocrystallineCu(18nm)hasbeeninvestigatedbymeansofsecondionmassspectroscopy(SIMS).Intheexperimentaltemperaturerangesfrom421to773K,thereseem-inglyexiststwodiffusionmechanisms.TheimpurityelementsOandCaresupposedtoaccumulatetothegrainboundariesandinhibitthefastgrainboundarydiffusion.

简介：Al-4。5Cu-5Pb合金被扔的沙和寒冷准备。一样的合金也是在1.6MPa的一个煤气的压力扔的水花。微结构特征展览一对为沙和寒冷铸石金的好树枝状的形态学粗糙。Equiaxed谷物被观察因为水花形成了合金。穿测试采用一根大头针--在圆盘上类型安装，揭示更加更低与寒冷和沙铸石金的相比水花穿扔的合金。词法特征在显示的标本和碎片上穿轨道混合oxidative-cum-adhesive为在现在的调查测试的这些合金穿机制。(编辑作者摘要)36个裁判员。

简介：PhysicalsimulationisusedtostudythemovementofnonmetallicparticlesinAlmeltinelectromagneticfield.ItisfoundthattheterminalvelocityofparticlesindifferentReynoldsnumberrangehasdifferentfunctions.ByconfirmingdragforcecoefficientofnonmetallicparticleswithReynoldsnumberintherangeof0.2～10and10～25respectively,twofunctionsofterminalvelocityforsphericalnonmetallicparticleshavebeengotaccordingly,whichprovideatheoreticalbasisforseparatingnonmetallicinclusionsfromAlmeltinelectromagneticfield.

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