简介：三维的磨擦促使焊接(FSW)过程模型基于液体力学被开发了。在焊接过程的材料运输被认为是laminar，粘滞、非牛顿经过一根旋转大头针流动的液体。划分焊接地区的一个标准根据速度地和粘性地的合作被给了。也就是说，在工具大头针附近存在的0-easy-flow地区对应于焊接金块地区；在0-easy-flow地区和1粘性乐队之间的区域被通信到热机械的影响地区(TMAZ)。模型给一些有用信息通过速度分发的模拟结果在FSW改进材料流动的理解。为了估价磨擦，促使大头针设计，三种大头针几何学，一个人是列大头针，第二是逐渐变细大头针，和最后大头针是螺丝钉线程逐渐变细大头针，在模型被使用。大头针几何学严重在0-easy-flow地区影响了速度分发的模拟结果。在0-easy-flow地区的速度分发能被看作优化磨擦的标准搅动工具设计。这研究将受益指导磨擦搅动工具设计。

简介：Afiniteelementbasedsensitivityanalysismethodforpreformdieshapedesigninmetalforgingisdeveloped.Theoptimizationgoalistoobtainmoreuniformdeformationwithinthefinalforgingbycontrollingthedeformationuniformity.Theobjectivefunctionexpressedbytheeffectivestrainisconstructed.Thesensitivityequationsoftheobjectivefunction,elementalvolume,elementaleffectivestrainrateandtheelementalstrainratewithrespecttothedesignvariablesareconstituted.ThepreformdieshapesofanH-shapedforgingprocessinaxisymmetricdeformationaredesignedusingthismethod.

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：Usingdirectfinitedifferencemethod,anumericalmodelforsimulatingthetemperaturefieldinthechargeduringinductionskullmelting(ISM)hasbeendeveloped.Onthebasisofthemodel,thetemperaturefieldinTi-47Ni-9Nbingothasbeencalculatedundervariousmeltingconditions.Finally,theprocessingparameters(meltingpower,melting-downtimeandthefinalmelttemperature)havebeenoptimized.

简介：Duetotheminiaturizationofmoderndevicesre-quirecomponentswithlightweight,highintegra-tionandtheabilitytostoreenergyinassmallvol-umeaspossible.Asaresult,energystoragedensitybecomesanimportantfigureofmeritforenergystor-agedevices.Inthispaper,firstly,wediscussedtheenergydensityinfine-grainedleadzirconatetita-nateglass-ceramicscompositewiththehelpofthe

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简介：Highentropyalloyhasattractedincreasingattentions.However,toenhancethealloystrengthoftenleadstoimpairmentoftheductility,orviceversa.HerewereportedaheattreatmentapproachonAlCrFeNi2Ti0.5highentropyalloy,whichcanelevatethestrengthandductilitysimultaneously.AningotofAlCrFeNi2Ti0.5weighing2.5kgwasfirstlyfabricatedbymediumfrequencyinductionmelting.Thensamplesfromthesameheightofthebulkingotwereannealedfor6hat600,700,800and1000℃,respectively.After1000℃annealing,anoptimalmicrostructurewasobtainedbyusingourapproachwhichcanmakesomeprecipitationparticlesdistributehomogeneouslyinthedendriteinteriorwhilekeeptheinterdendritestructureasasinglesolidsolutionphase.ThemechanicaltestonthisAlCrFeNi2Ti0.5alloysampleshowedthat,thecompressivefracturestrengthσbcwasincreasedbyabout600MPaandtheplasticstrainepwasdoubled,comparedwiththoseoftheas-castsample.Ourapproachcanbereadilyadaptedtolarge-scaleindustrialproductionofhighentropyalloyswithhighstrengthandductilitybyproperannealingtreatment.

简介：这学习介绍鸡蛋壳的使用利用手掌的废物基于的核壳通过他们的表面的修正激活碳(PKSAC)到提高H的吸附能力2S。反应表面方法论技术被用来优化过程条件，他们被发现是：为H2S起始的集中，在接触时间的540min和为吸附物的1g集中。三安排的影响H2S移动效率和使妊娠的交流产量被调查。两回答IAC收益(IACY，%)并且移动效率(RE，%)被最大化优化IAC准备条件。为IACY和RE的最佳准备条件如下被发现：880的IAC的锻烧温度???ì