简介：Theeffectsofconcurrentpulsesinholdingdurationonsuperplasticityof2091Al-Lialloyhavebeeninvestigatedinthispaper.Theresultsofsuperplasticdeformationshowedthatconcurrentpulsesinholdingdurationdecreasedtheoptimumholdingtimeforsuperplasticdeformation(ε=3.33×10-2s,T=500℃)from15to5minandincreasedelongation（δ）from530to550%.Themetallographicobservationsshowedthatthespecimensappliedlybyconcurrentpulsewerecom-pletelyrecrystallizedafterholding5minat500℃,andgrainsrefinedtoabout2μm,andthosespec-imensunappliedcurrentpulseswerepartlyrecrystallizedevenafterholding15minat500℃.theelectronprobeanalysesindicatedthatconcurrentpulsespromotedatomicdiffusion.Itispointedoutthatconcurrentpulsesaccelerateatomdiffusionanddislocationmotion.increasenucleationrateofrecrystallizationanddecreasetheoptimumholdingtimeforsuperplasticdeformationandincreasesuperplasticproperties.

简介：以便得到TiB2-Al2O3的同质的混合物和协议，一个表面修正方法被用来准备nano规模的杂交Al2O3涂的TiB2粒子。PE蜡粒子是第一到由杂交，然后nano规模Al2O3粒子的TiB2粒子上涂又是涂的到由PE蜡粒子涂的TiB2的表面上。SEM，TEM和版本被用来描绘同样收到的核心/壳粒子和它的协议的微观结构。试验性的结果显示出那粒子规模TiB2和Al2O3的同质的分散能不仅在混合粉末而且在使脱蜡的协议被形成。协议当时是由煤气压的sintering(GPS)的sintered。物件顶端的装饰物产品显示出与参考样品由正常方法制作了作比较的改进技工性质。

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简介：透明的传导性的铝做了锌氧化物(ZnO:艾尔，偶氮)电影被rf(收音机频率)在玻璃底层上准备磁控管从ZnO劈啪作响：3wt%艾尔2O3陶器的目标。氩气体压力的效果(PAr)与小变化被调查在这些电影的电、光、结构的性质上理解影响。使用X光检查衍射(XRD)并且扫描电子显微镜学(SEM)的结构的考试证明ZnO:薄电影是的艾尔(002)面向。抵抗力价值被四点的探查与5.76穩摥甠楳杮愠?灯楴業敺?票牤瑯敨浲污洠瑥潨?倠牵?桰獡?景?㈱?眠獡朠瑯愠?的最低抵抗力测量?潣灭牡瑡癩汥?潬敷?整灭牥瑡牵?挨愮??‰??楳瑳?景漠敮?睴?琠牨敥?牯映畯?慬敹獲漠?敭慴?晲捡獥瀠慬散?湩琠敨渠慥?楦汥?敲楧湯漠??業牣獯牴灩瀠瑡档愠瑮湥慮?桔?湡整湮?慲潤敭猠獹整?慧湩椠?浩牰癯摥戠????潣灭牡摥琠?桴?慰'?湡整湮?污湯?愠摮琠敨爠摡慩楴湯瀠瑡整湲栠污?吗潰敷?敢浡楷瑤?獩爠摥'转棳_??L潳灲楴湯瀠慥獫眠牥?獡楳湧?敧愠敲?吠敨栠杩汨?晥楦楣湥?L潳灲楴湯漠？

简介：AnewmethodforcorrosionprotectionofAl-basedmetalmatrixcomposites(MMC)wasdevelopedusingtwo-stepprocess,whichinvolvesanodizinginH2SO4solutionandsealinginrareearthsolution.Corrosionresistanceofthetreatedsurfacewasevaluatedwithpolarizationcurves.TheresultsshowedthattheeffectoftheprotectionusingrareearthsealingisequivalenttothatusingchromatesealingforAl6061/SiCp.TherareearthmetalsaltcanbeanalternativetothetoxicchromateforsealinganodizedAlMMC.

简介：Theinterfacialbindingcovalentbonddensity(CBD)andthelocalenvironmentaltotalbondorder(LTBO)oftheNi/Ni3Alinterfacewithdifferentlatticemisfits(δ)werecalculatedbyusingfirst-principlesdiscretevariationXαmethod.ItwasfoundthattheeffectsoflatticemisfitsontheelectronicstructuresofincoherentNi/Ni3Alinterfacewereveryobvious.Ononehand,lessthan-0.6%negativelatticemisfitcanpromotethebindingstrengthofγ/γ′interface.Ontheotherhand,thetotalbondingstrengthofγ/γ′interfacedecreaseswithincreasingδ.Therefore,themagnitudeandsignoflatticemisfitmustbecarefullycontrolledforbalancingthehightemperaturecreepstrengthofNi-basesinglecrystalsuperalloyandthestructuralstabilityofγ/γ′interfacewhenonedesignsanewNi-basesinglecrystalsuperalloy.

简介：Inthispaper,polycrystallinesiliconfilmsweredepositedbyelectroncyclotronresonanceplasma-enhancedchemicalvapordeposition(ECR-PECVD)usingSiH_4/ArandSiH_4/H_2gaseousmixture.EffectsofargonflowrateonthedepositionefficiencyandthefilmpropertywereinvestigatedbycomparingwithH_2.TheresultsindicatedthatthedepositionrateofusingArasdischargegaswas1.5-2timeshigherthanthatofusingH_2,whilethepreferredorientationsandthegrainsizesofthefilmswereanalogous.FilmcrystallinityincreasedwiththeincreaseofArflowrate.OptimizedflowratioofSiH_4toArwasobtainedasF(SiH_4):F(Ar)=10:70forthehighestdepositionrate.

简介：三不同Ti-Si氧化物structuares，硅石支持了titania，硅石涂的titania和亲密地混合的silica-titania，包含10%-40%SiO2，被nanocrystalline(nc)的微观结构参数的sol-gelprocess.The变化在二进制氧化物的三kirds成为TiO2锐钛矿包括在里面飞机间距d，电池常数(a0，C0)，房间体积V，房间轴比c0/a0和水晶谷物缩放，被高决定传播电子显微镜学(HRTEM)和X光检查衍射(XRD)比较地调查。微观结构参数与增加SiO2内容显著地变化，这被发现，annealingtemperature.Different组织了Ti-Si二进制氧化物导致微观结构参数的不同变化趋势。二进制氧化物包含越多SiO2，ncTiO2锐钛矿的缺点越格子出现；Si阳离子的散开或移植能是在微观结构的变化的一个重要有影响的因素。在三种二进制氧化物的ncTiO2的谷物尺寸不仅取决于SiO2内容和退火的温度而且在ncTiO2-anatase.Both谷物尺寸和nc的阶段转变的格子microstrainand失真的度上，TiO2锐钛矿是有效地与增加SiO2内容禁止了。

简介：通过湿化学方法合成了纳米α-Fe颗粒。合成铁纳米颗粒的化学溶液由稀释的二价铁溶液、甲醇和十二烷基硫酸钠组成。在溶液中以NaBH4为还原剂．将二价铁离子直接还原为α-Fe颗粒，得到的金属铁颗粒以氧化硅进行包覆．在金属铁表面生成致密的氧化硅膜．防止金属铁被再氧化。在铁的合成过程中通入了超声波，以加速药剂的扩散并防止和减小生成物的团聚。以X射线衍射、差热0热重分析和透射电镜对合成产物进行分析和检测。结果表明，采用湿化学法可以直接还原制备α-Fe．其颗粒大小为10-40nm。

简介：Tensileandfracturebehaviorsofsandwich-structuredcompositesconsistingofaFe-basedamorphouslayerwithaconstantthicknessandultrafine-grainedNilayerswithdifferentthicknesseswereinvestigated.TheresultsindicatethattheinitiationandthestablepropagationoftheshearbandintheamorphouslayerwasdominatedbytheNilayersduetotheirstrongconstraintrole.ThecatastrophicfractureoftheamorphouslayerwaspostponedinthesandwichcompositesthroughproperlyincreasingtheconstrainedNilayerthickness,whicheffectivelydecreasedtheshearstressontheshearfractureplanesoftheamorphouslayer,andthusledtostablepropagationoftheprimarySBcharacterizedbytheincreaseinthesmoothregionsizeoftheshearband.

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简介：铸造铝合金在诸多方面有着极其广泛的应用。阐述了铸造铝合金强化的途径，包括舍金化、变质处理、晶粒细化和熔体处理。研究和试验表明，铸造铝合金可以通过上述方法得到强化。

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简介：采用HSiCl3—NH3—N2（稀释气体）体系在石英陶瓷基板上通过低压化学气相沉积（LPCVD）法沉积出了Si3N4涂层，研究了工艺条件对涂层沉积速率的影响。结果表明，在没有稀释气体的情况下，随着沉积温度升高，Si3N4涂层的沉积速率逐渐增加，在850℃附近达到最大值，随着反应温度的进一步升高，涂层沉积速率下降。当存在稀释气体时，在所选温度范围内随着沉积温度的升高，Si3N4涂层的沉积速率一直增大，反应的表观活化能约为222kJ／mol。随着原料中NH3／HSiCl3流量比值的增大，Si3N4涂层的沉积速率逐渐增加，随后稳定，但稍有下降趋势。在所选稀释气体流量范围内，Si3N4涂层的沉积速率随着稀释气体流量的增加而增大。

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简介：TheAlNp/2024compositewithahighvolumefraction(50%)wasfabricatedbysqueezecasting.Itsmechanicalpropertieswereinvestigatedbytensiletestsatambienttemperatureandthemicrostructurewasobservedbyatransmissionelectronmicroscope(TEM).ItwasindicatedthataftersixthermalcoolingcyclestreatmenttheAIN/2024Alcompositeexhibitedhigherelasticlimit(σ0.01),tensilestrength(UTS)andelasticmodulus(E).TEMobservationshowedthattherewashigherdislocationdensitybothinthematrixandtheparticle.δ′phaseisthemainlyprecipitate.