简介：3，5，20层从奥氏体的不锈钢，纯铝和铝合金表的穿着的板以不同方法被制作。段和接口性质被测量。结果显示出穿着的板是的那20层比其它好。结合得好的穿着的板成功地在下列过程被获得：从18张层Al1060/Al3003表的基本的穿着的表第一在450点与44%的起始的滚动减小被获得???????????????″??吗？？

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简介：Aresidual-stressprofilealongthethicknessofanaluminumalloysheetisdeterminedbylaser-ultrasonictechnique.SurfaceacousticwavesaregeneratedbyaNd:YAGpulselaseranddetectedbyaHeterodyneinterferometeronalateralfreesurfaceofthesheet.Thedistributionofresidualstressisdeterminedbymeasuringtherelativevariationofthewavevelocitiesatdifferentlocationofthesamplealongitsthickness.Thistechniqueisvalidatedbythreedifferentresidualstressprofilesobtainedexperimentally.

简介：合成电影被阳极化联合和稀土元素免职在A356铝合金上制作。在3.5%NaCl答案的合成电影的腐蚀保护效果和腐蚀行为被电气化学的阻抗光谱学(EIS)学习。SEM观察显示稀土元素Ce电影完全封上阳极的电影的多孔的结构，并且合成电影阳极的电影创作了，Ce电影紧缩、综合。根据EIS的特征，在不同沉浸时间的合成电影的EIS阴谋用Rsol(QceRce)(QaRa)的相等的电路被模仿，Rsol(QceRce)(QpRp)(QbRb)和Rsol(QpRp)(QbRb)分别地当模特儿。测试结果证明在合成电影的外部层的Ce电影在沉浸腐蚀的起始的阶段有好保护效果。阻止氯化物熨斗渗透铝合金矩阵有效地在内部层帮助了阳极的电影。在18天以后，Ce电影失去了它的防腐蚀的性质，并且阳极的电影带头了腐蚀保护的角色。当腐蚀时间直到42天时，铝矩阵还没被侵蚀。因此，为A356铝合金的合成电影的更高的保护度被归因于阳极的电影和稀土元素Ce电影的协同效果。

简介：与电极尖端的squeeze，铝(艾尔)上的氧化物电影合金表面被打破并且数微差距随机被形成。微差距的行为在焊接的开始作为进行看到，因此接触抵抗在艾尔合金的点焊极其高、不稳定。在这份报纸，一个新接触抵抗模特儿被收养模仿形成过程的金块。这个模型描述进行点的随机的分发特征。模拟结果显示那，在焊接电流的开始的5ms以内(交流，50Hz)，在细工品接口的温度分发严重是不规则的。另外，金块不从焊接中心起核心作用并且然而，连续地成长它几乎即刻地从几个点随机起核心作用然后快速合并进一个实体。试验性的结果同意了数字模拟。

简介：Themicrostructuresaftercastingandextruding,themechanicalpropertiesandelectricalconductivityafterRRAtreatmentofconventionalDCcastingandlowfrequencyelectromagneticcasting(LFEC)7075aluminumalloywereinvestigated.TheresultsshowedthatfinergrainswhichdistributedmorehomogeneouslywasobtainedinLFECingotscomparedwiththoseconventionalDCingots.TheextrudedbarsofLFECalloykeptitsfinegrainfeaturesoforiginalas-caststructure.IntheRRAtreatment,withtheextensionofsecondagingtime,thetensilestrengthandhardnessofalloydecreased,buttheelectricalconductivityincreased.Meanwhile,asthesecondagingtemperatureraised,thephasechangerateinprecipitationalsoincreased.Underthesameconditions,extrudedbarsofLFECalloyhadbetterperformancethanthatofconventionalDCcastalloy.TheoptimumRRAheattreatmentprocesswas120℃/24h+180℃/30min+120℃/24h.TheLFECextrudedbarsacquiredtensilestrength676.64MPa,hardness198.18,andelectricalconductivity35.7%IACSrespectively,whichwerehigherthanthatintheT6temper,indicatingthatanotableRRAresponsetakesplaceinLFECextrudedbars,whosesecond-stepretrogressiontimewas30min,anditwassuitableformassproduction.

简介：Themultilayered7XXXseriesaluminumalloywasimpactedby7.62mmogivalprojectilesatvelocitiesrangingfrom787to851m·s~(-1).Thedeformedmicrostructureundervariousimpactingvelocitiesandfracturesurfacesofdifferentsectionswereinvestigatedatdifferentphysicalscalestodeterminetheprocessoffailure.Opticalmicroscopy(OM),electronback-scattereddiffraction(EBSD)andscanningelectronmicroscopy(SEM)wereusedintheinvestigation.Theresultsshowthatcraterisconstrainedinthe7B52frontlayerandtwotypesofadiabaticshearbandswhicharetransformedbandsanddeformedbandsanddifferenttypesofcracksareobserved.Spallfractureisthesignificantfailuremodeof7B52frontlayer,andtheresultingdelaminationleadstothepresenceofbendingtensilefractureinsteadoftheshearplugging.Theductile7A01layerbluntsanddeflectsthespallcracktips,preventingthetargetsfromfullspall,andinducesaconstraintof7A52rearlayer.Theleveloftheconstraintdeterminesdifferentfracturemodesof7A52layer,accountingfortheasymmetryofdamage.

简介：Asameansofsurfacemodificationprocess,metalsurfacenanocrystallization(MSN)hasattractedwidespreadattentionandenjoyedagreatprospect.However,currentlylittleresearchiscarriedoutregardingMSNofweldedjoint.Theprocessesofhighenergyshotpeening(HESP)technologyandultrasonicimpacttreatment(UIT)werecarriedouttoachievejointsurfacenanocrystallization.ThegrainsizeofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithX-raydiffractometer,thesurfacedeformationlayerthicknessofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithopticalmicroscopy,thesurfacehardnessofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithmicrohardnessmachine.TheresultsshowthatbothoftheprocessescanachieveweldedjointsurfacenanocrystallizationandtheweldafterHESPhavesmallergrainsize,largerdeformationlayerthicknessandhigherhardnessvaluesthanthoseafterUIT.However,HESPisrestrainedbytheshapesandsizesofweldingmaterials,sotheUITprocessispreferredtouseinthegeneralengineeringpracticalapplications.

简介：Currentstudiesareaimingatmonitoringcorrosiondamageofaircraftmainstructuresbyusingacousticemission(AE)techniqueandatsupplyingusefuldatafordeterminingcalendarlifeoftheaircraft.ThecharacteristicsofAEsignalsproducedduringacceleratingcorrosionprocessaredescribed,andmethodsforevaluatingcorrosiondamagesanddeterminingremaininglifeofmainstructuresofaircraftusingAEtestingareoutlined.ExperimentalresultshaveshownthatAEtechniquecandetectcorrosiondamageofaluminumalloymuchearlierthanconventionalnon-destructivetestingmeans,suchasultrasonictestingandeddycurrenttesting.RelationshipbetweencorrosiondamageandAEparameterswasobtainedthroughinvestigatingcorrosiondamageextentandchangesofAEsignalsduringacceleratingcorrosiontest,andshowingthatAEtechniquecanbeusedtodetectearlycorrosion,investigatingcorrosiondevelopingtrend,andinmonitoringandevaluatingcorrosiondamages.

简介：四个参数，煤气的流动，旋转速度，精制时间，和炖的时间的效果，在7075的旋转impeller精炼上，艾尔被学习。C2精制的Cl6，精制的旋转impeller，并且7075艾尔合金的合成精制与对方相比。结果证明旋转impeller精炼的最大的影响参数是旋转速度，由煤气的流动，精制时间，和炖的时间列在后面。直角的分析获得的最佳纯化参数如下：400r/min，0.4mL/h的惰性的煤气的流动，15min的精制时间，和6min的炖的时间的转子速度。最好的排除效果能被C2Cl6和旋转impeller。C2Cl6,旋转impeller，并且合成精制分别地是34.5%，69.2%，和78%。旋转impeller精制的标本的机械性质比由C2精制的Cl6，但是比那些低由合成精制。

简介：Obtainingtheimageofmoltenpoolaluminumalloy'stungsteninertgas(TIG)weldingbecomesachallengingproblemintheweldingfield.Inthispaper,abran-newopticalsensorbasedanalyzingthelightspectrumwasdesigned,andtheclearimageofthemoltenpoolduringthealuminumalloy'sweldingusingthecommonindustrialCCDcamerawasobtained.Andwiththenewalgorithmprovidedbymyself,thedesirablecharacteristicparametersofthemoltenpoolofaluminumalloy'sweldingwereobtained,anditprovidesagoodbaseforadvancedmonitorweldingquality.

简介：为商业地制作的合金的三种典型产品状态的微观结构2195被观察。热转动的板被包含罚款的含纤维的结构描绘，这被发现，polygonized基础；并且滚动寒冷的表被包含高密度脱臼房间的pan-caked谷物结构描绘。脾气被证明包含大量散、塑造板的T1(Al2CuLi)的在近的山峰老化下面的产品猛抛，和theta的小部分；“(Al2Cu)盘子，展出机械性质的理想的联合。用扫描电子显微镜学的分析表明许多粗糙的、不规则形状的Al7Cu2Fe成分粒子处于所有产品状态存在，它显示中间的热处理几乎没在这个引起铁的、有害阶段上有小影响。为合金2195的不同产品状态的微观结构的形成和进化在商业生产条件的看法点被讨论。

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：Inthispaper,thebrazingmechanismofLY12aluminumalloyatmiddlerangetemperaturewaspresented.TheCsF-AlF3non-corrosivefluxwasutilizedtoremovethecomplexoxidefilmonthesurfaceofLY12aluminumalloy.TheresultsrevealedthattheoxidefilmwasremovedbytheimprovedCsF-AlF3fluxaccompaniedwiththeoccurrenceofreactionaswellasdissolutionandthecompoundsCsFplayedanimportantroletoremovetheoxidefilm.Actually,thehighactivityofflux,say,theabilitytoremovetheoxidefilm,wasduetothepresenceofthecompounds,suchasNH4F,NH4AlF4andcompositemoltensalt.TheproductionofHFwasthekeyissuetoacceleratethereactionandenhancetoeliminatetheoxidefilmbydissolution.ItwasfoundthattherareearthelementLaatsmallpercentagewasnotenrichedattheinterface.Moreover,therareearthfluorideenhancedthedissolutionbehavior.

简介：Fromtheviewpointofweldingmechanics,twonewweldingmethods-weldingwithtrailingpeeningandweldingwithtrailingimpactiverollingwereintroduced.Foraluminumalloythin-shellstructureswithhighstrength,weldingwillleadtohotcracking,poorjointanddistortion.Inordertosolvethem,trailingimpactivedevicewasusedbehindweldingtorchtoimpactthedifferentpositionsofweldedjoints,thusrealizingtheweldingwithfree-hotcracking,lowdistortionandjointstrengthening.Byuseofimpactiverollingwheelsinsteadofpeeningheads,theoutlookofweldedspecimencanbeimprovedandstressconcentrationatweldtoescanbereduced.Equipmentofthistechnologyissimpleandportable.Itcanusedtoweldsheets,longitudinalandring-likebeamsoftube-likestructures,aswellasthethin-shellstructureswithclosedweldssuchasflangesandhatches.Sothetechnologyhasthewideapplicationforegroundinthefieldsofaviationandaerospace.

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简介：微观结构和2519A铝合金板的机械性质上的Yb内容的效果借助于张力的测试，光显微镜学，传播电子显微镜学，扫描电子显微镜学和X光检查衍射计被调查。结果显示出Yb增加的0.17%的那增加(集体部分)密度“2519A合金板和还原剂的粒子变粗的速度率”在300牣獯潣楰?桰獡?楦汥?瑳摵?的阶段湯愠楧杮戠桥癡潩?景丠???娷?愠汬祯

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