简介:AmodelhasbeendevelopedtodescribethemicrostructureevolutionintheatomizeddropletsofCu-Fealloyduringcoolingthroughthemetastablemiscibilitygap.CalculationshavebeenperformedforCu85Fe15alloytoinvestigatetheprocessofliquid-liquidphasetransformation.Thenumericalresultsindicatethattheminorityphasedropletsarenucleatedinatemperatureregionaroundthepeakofthesupersaturation.TheaverageradiusoftheFe-richdropletsdecreasesandthenumberdensityoftheminorityphasedropletsincreaseswithdecreasingtheatomizeddropletsize.Thesimulatedresultswerecomparedwiththeexperimentalones.Thekineticprocessoftheliquid-liquidphasetransformationwasdiscussedindetail.
简介:Usingaspecialconstantdeflectiondevice,thechangesindislocationconfigurationaheadofaloadedcracktipfor60Fe40Nialloy,beforeandaftermagnetizationinamagneticfield,havebeenstudiedinTEM.Theresultsshowedthatthemagnetizationfor60Fe40Nialloycouldenhancedislocationemission,multiplicationandmotion.Also,themechanicalpropertiesof60Fe40Nialloy,inairandinthemagneticfieldrespectively,havebeeninvestigatedusingtheslowstrainratetension.Andtheresultsindicatedthatmagnetizationcouldmaketheyieldstrengthcorrespondingtodecreaseby26percent,butdidnotinfluencetheultimatetensilestrengthandthefracturestrain,whichshowedthatmagnetizationcouldenhanceplasticdeformation.
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简介:Excessiveconsumptionofelectricalenergyhashamperedthewidespreadapplicationofelectrochemicaltechnologyfordegradationofvariouscontaminants.Inthispaper,aFe-basedmetallicglass(MG)wasdemonstratedasanewtypeofelectrocatalysttoeffectivelyandeconomicallydegradeanazodye.Incomparisontoothertypicalelectrodes,Fe-basedMGelectrodesexhibitaminimizeddegradationtime,andthespecificenergyis4-6ordersofmagnitudelowerthanthatofdimensionallystableanode(DSA),metal-likeboron-dopeddiamond(BDD)andotherelectrodes.Assacrificialelectrodematerials,Fe-basedMGshavelessspecificelectrodemassconsumptionthanironelectrodes.TheuseofFe-basedMGswillpromotethepracticalapplicationofelectrochemicaltechnologyandtheuseofMGsasfunctionalmaterials.
简介:Inthiswork,compressive,flexuralandsplittensilestrengthtogetherwithcoefficientofwaterabsorptionofhighperformanceself-compactingconcretecontainingdifferentamountofFe2O3nanoparticleshavebeeninvestigated.ThestrengthandthewaterpermeabilityofthespecimenshavebeenimprovedbyaddingFe2O3nanoparticlesinthecementpasteupto4.0wt%.Fe2O3nanoparticleasaforeignnucleationsitecouldaccelerateC-S-HgelformationasaresultofincreasedcrystallineCa(OH)2amountespeciallyattheearlyageofhydrationandhenceincreasethestrengthofthespecimens.Inaddition,Fe2O3nanoparticlesareabletoactasnanofillersandrecovertheporestructureofthespecimensbydecreasingharmfulporestoimprovethewaterpermeability.Severalempiricalrelationshavebeenpresentedtopredicttheflexuralandthesplittensilestrengthofthespecimensbymeansofthecorrespondingcompressivestrengthatacertainageofcuring.Acceleratedpeakappearanceinconductioncalorimetrytests,moreweightlossinthermogravimetricanalysisandmorerapidappearanceofpeaksrelatedtohydratedproductsinX-raydiffractionresultsindicatethatFe2O3nanoparticlesupto4wt%couldimprovethemechanicalandthephysicalpropertiesofthespecimens.
简介:摩尔比为Ni2+:Zn2+:Fe3+:0.6:0.4:2.0的水溶液与OH-在气泡液膜中进行共沉淀反应,制得0.6Ni(OH)2(H2O)0.75·(0.4-n)Zn(On)2·2(1-m—n)Fe(OH)3·mFezO3·nZnFe2O4·xH2O前驱体,微结构为大量螺旋状分子簇和少量亚晶结构,用XRD检测结果表明,前驱体在室温放置10和14个月的转化产物是Fe2O3,ZnFe2O4和Nin6Znn.Fe2O4;放置55个月的主要产物是Nin6Znn4Fe2O4。提出了分子簇演绎氢氧化物脱水,优先生成Fe2O3晶核,亚晶结构演绎新生态氧化物分子自组装的低温自发固相反应机理。
简介:用organo听Sn(OC4H9)4作为先锋,钠dodecylsulfonate(SDS)和SDS明胶(SDS-G)象模板复杂,二听二氧化物胶体的粒子被准备由一自己组装方法。两个SnO2产品分别地与SDS-G与SDS和SnO2-C粒子被标记SnO2-B粒子,它在制作相应于SnO2-B和SnO2-C传感器的SnO2煤气的传感器被使用。X光检查衍射(XRD),扫描电子显微镜学(SEM),传播电子显微镜学(TEM)和thermogravimetry和不同热分析(TG/DTA)被用于描述。试验性的结果证明SnO2-B胶体的粒子由mesoporous组成像片的粒子,当SnO2-C粒子主要由球形的粒子组成时。煤气的察觉到大小证明那个SnO2-B传感器执行察觉到反应到所有目标气体的最好,包括H2,C2H5OH和液体石油气体(LPG)。特别地,SnO2-B传感器的察觉到的反应在1000潩獮的集中在H2空气在32点被完成
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简介:利用喷射沉积工艺制备Al-3.3Fe-10.7Si合金坯,经挤压制成试样。研究了合金组织、韧性及内耗行为,得出该合金在60-250℃温度范围产生的内耗峰,是由于晶界滑动弛豫引起的,弛豫过程激活能为172.2kJ/mol。在内耗峰位置晶界滑动消耗部分振动能,合金韧性在此处出现极大值。
简介:Theyolk-shellFe3O4@Cnanocubesweresuccessfullysynthesizedthroughcarbothermicreductionprocessfromcarbon-coateda-Fe2O3precursor.Theresultsshowthattheyolk-shellFe3O4@Cnanocubesareuniformlycoatedwithathincarbonlayer,andaclearcavityabout150nminwidthbetweenFe3O4coreandcarbonshellareformedduetothevolumeshrinkageduringthereductiontreatment.Theobtainedyolk-shellFe3O4@Cnanocubesexhibitexcellentcyclingstability(thedischargecapacityis709.7mAh/gafter100cyclesatthecurrentdensityof0.1C)andrateperformance(1023.4mAh/gat0.1C,932.5mAh/gat0.2C,756.1mAh/gat0.5C,405.6mAh/gat1C,and332.3mAh/gat2C,andmoreimportantly,whenthecurrentdensityfinallybacksto0.1C,acapacityof776.8mAh/gcanberestored).Theoutstandinglithiumstoragepropertiesmaybeattributedtotheuniqueyolk-shellstructures.