简介：GaxIn1-xAs1-ySbyalloyshavebeengrownbyatmosphericpressureMOCVDonn-GaSb（Te-doped）substrate.Thesohdcompositionwasdeterminedbyusingelectronmicroprobe.ThealloysofGalnAsSbwithcompositioninmiscibilitygapweresuccessfullygrown.TheopticalpropertiesofGaxIn1-xAs1-ySbylaverswerecharacterizedbythephotoluminescenceandtheinfraredabsorption.Thespectralresponsesofp+-GaInAsSb/p-GaxIn1-xAs1-ySby/n-GaSbdetectorsshowedwavelengthcutoffat2.4μmanddetectivity-D*=5×108cmHz1/2/Watroomtemperature.

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简介：RapidsolidificationofCu-Pbmonotecticalloyshasbeenaccomplishedduringfreefallina3mdroptube.BothmacrosegregatedanduniformlydispersedstructuresareobservedinCu-40wtpctPballoydroplets,whereasdropletsofcompositionCu-64wtpctPbexhibitonlymacrosegregationmorphologies.Themicrostructuresarestronglydependentondropletsize.Thehigherundercoolingtendstofacilitateliquidphaseseparationandresultsinmoreextensivemacrosegregationinsmallerdroplets.ThereexistsapronouncedtendencyforthePb-richliquidtooccupythesurfaceofthedropletsofbothcompositions,resultingfromthequitelowersurfacetensionofthePb-richphaseandcausingaPb-richlayeratthesurfaceofthesolidifieddroplet.ThenucleationofmonotecticcellsintheCu-40wtpctPbdropletswithdispersedstructurespreferentiallyoccursatthedropletsurface.Asinglenucleationeventtakesplacemorefrequentlyasdropletsizeisreduced.

简介：TherearetwotpyesofphasetransformationsinFe-MnandFe-Mn-Sialloyswhenthetemperatureisdecreased,γ(fcc)→ε(hcp)martensitictransformation(MT)andparamagnetic-antiferromagnetictransition(AMT)ofγphase.Fromthethermodynamicpointofview,theformerusuallyappearsinaslightlyhighertemperaturerangethanthelatterbecauseifisgenerallyacceptedthatthemagnetictansitionhasasuppressingeffectonthethermallyinducedεmartensite(Satoetal.,1984.,BogachevandZvigintzeva,1976;Murakamietal.,1987:Yangetal.,1992)GartsteinandRobinkin(1979)eventhoughtthattheγ-εtransformationshouldbeterminatedbelowNeeltemperature(TN)duetothedecreaseoffreeenergyarisingfromtheAMTofγphase.However,someexperimentalresultshaeindicatedtheformationofεphasebelowT(LiandWayman,1994:Fujimori.1966).Inthepresentwert.thebehavorofγ-εtransformationbelowTNwasfurtherinvestigatedbyclectricalresistancemeasurements.

简介：电气化学的实验被执行测试铝锌的腐蚀率热剧降的涂层。5.3%铝锌合金(重量比率)有优异耐蚀性质，这被显示出。坚定的微观结构显示了由纳米组成的非结晶的结构系统的大小的粒子。分析显示了5.3%铝锌系统的吉布斯精力的大否定变化。分子的动力学模拟证明5.3%铝锌系统从另外的系统有很不同的行为。这个特别系统的阶段转变从模拟被观察。转变温度在400K附近被决定。模拟显示5.3%铝锌系统在从300～900K的温度范围上是非结晶的，支持从铝锌合金的非结晶的固体有的实验的推理特殊耐蚀特性。

简介：ThisworkstudiesTedopingeffectsonthedirectbandgapphotoluminescence（PL）ofindirectGaxIn1-xPalloys（0.72≤x≤0.74）.Thetemperature-dependentPLshowsthattheenergydifferencebetweendirectΓvalleyandindirectXvalleysisreducedduetothebandgapnarrowing（BGN）effect,andthedirectbandtransitiongraduallydominatesthePLspectraastemperatureincreases.CarrierthermalizationhasbeenobservedforTe-dopedGaxIn1-xPsamples,asintegratedPLintensityincreaseswithincreasingtemperaturefrom175to300K.Theactivationenergyforcarrierthermalizationisreducedasdopingconcentrationincreases.BothBGNeffectandcarrierthermalizationcontributetothecarrierinjectionintotheΓvalley.Asaresult,thedirectbandtransitionisenhancedintheTe-dopedindirectGaxIn1-xPalloys.Therefore,thePLintensityoftheGa0.74In0.26Psamplewithactivedopingconcentrationof9×1017cm-3isincreasedbyfivetimescomparedwiththatofanominallyundopedsample.ItisalsofoundthatthePLintensityisdegradedsignificantlywhenthedopingconcentrationisincreasedto5×1018cm-3.Fromcross-sectiontransmissionelectronmicroscopy,nolargedopantclustersorotherextendeddefectswerefoundcontributingtothisdegradation.

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简介：在不同温度的非结晶的CuHf合金的结构的因素由使用高温度X光衍射计的redetermined。theshort范围顺序结构而且中等范围的顺序结构在非结晶的CuHfalloys存在，这被发现不仅。合金融化的CuHf的动态粘性被扭力的摆动粘度计测量。脆弱过热CuHf合金融化基于粘性数据被计算。形成CuHf的能力的玻璃是的试验性的结果表演仔细与脆弱有关他们的超级加热融化。在中等范围顺序结构和脆弱之间的关系过热融化也在非结晶的CuHfalloys被建立了。与supercooled液体的脆弱相对照，过热的液体的脆弱答应一条更好的途径到反映形成液体的玻璃的动力学。

简介：Thedevelopmentofthermalanalysistechniquesforevaluationofcastalloymeltqualityanditscurrentapplicationsinthefoundrywerereviewed.Thecharacteristicsofthecurrentthermalanalysistechniqueswereanalyzed.Anewcomprehensivemethodforcoolingcurverecognitionhasbeenproposed.Theevaluationofcastalloymeltqualitywasrealized.

简介：Precipitationresponseofarecentlydevelopedb-typeTi–25Nb–2Mo–4Snalloy(wt%)duringagingwasinvestigatedindetail.Experimentalresultsindicatethatthemetastableωorequilibriumαphasecanformalternativelyevenunderthesameagingcondition,dependingontheconditionpriortotheaging,i.e.,solutiontreatmentorseverecoldrolling.Thisprovides,forthefirsttime,thedirectevidenceforthecompetitionbetweenωandαinagedβ-typeTialloys.Thispeculiaragingresponseisfoundtobecloselyrelatedtohigh-densitydislocationsandgrainboundarieswhichsuppresstheformationofωbutfavortheprecipitationoffineaphase.

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简介：ThispaperinvestigatesthesolidificationbehaviouroftheAg—Cueutecticalloymeltundercooledupto100K.ItisrevealedthatlamellareutecticsgrowinadendriticformintheAg-Cueutecticmeltwithundercoolingequaltoorgreaterthan76K.Asundercoolingincreases,theremeltedfractionoftheprimaryeutecticsduringrecalescencerises.Thesevereremeltingandthesubsequentripeningoftheprimaryeutecticdendritesleadtotheformationofanomalouseutectics.

简介：ThehydrogenstoragepropertiesofTi1.2Fe+xCa(x=1%,3%and5%inmassfraction)alloyswasinvestigated.ResultsshowthatthemodifiedalloyscanbeactivatedwithoutanythermaltreatmentatroomtemperatureduetotheadditionofCaandexcessTiinthealloys.HydrogenstoragepropertiesofthesemodifiedalloysvarywithCaamountandreactiontemperature.Inaddition,theinfluencemechanismoftheadditionofCaandexcessiveTiontheactivationbehaviorandhydrogenstoragecapacityofthealloyswasdiscussed.

简介：PhasesandmicrostructuresofthreehighZncontainingAl–Zn–Mg–Cualloyswereinvestigatedbymeansofthermodynamiccalculationmethod,opticamicroscopy（OM）,scanningelectronmicroscopy（SEM）energydispersivespectroscopy（EDS）,X-raydiffraction（XRD）,anddifferentialscanningcalorimetry（DSC）analysis.TheresultsindicatethatsimilardendriticnetworkmorphologiesarefoundinthesethreeAl–Zn–Mg–Cualloys.Theas-cast7056aluminumalloyconsistsofaluminumsolidsolution,coarseAl/Mg（Cu,Zn,Al）2eutecticphases,andfineintermetalliccompoundsg（MgZn2）.Bothofas-cast7095and7136aluminumalloysinvolvea（Al）eutecticAl/Mg（Cu,Zn,Al）2,intermetallicg（MgZn2）,andh（Al2Cu）.Duringhomogenizationat450°C,fineg（MgZn2）candissolveintomatrixabsolutely.Afterhomogenizationat450°Cfor24h,Mg（Cu,Zn,Al）2phasein7136alloytransformsintoS（Al2CuMg）whilenochangeisfoundin7056and7095alloys.ThethermodynamiccalculationcanbeusedtopredictthephasesinhighZncontainingAl–Zn–Mg–Cualloys.

简介：MicrostructureandtextureofTi-Nb-Sibasedalloys,preparedbywaterquenchingfromβ-phasefield,coldrollingandrecrystallizationheattreatmentfollowedbywaterquenching,wereinvestigatedintermsofopticalmicrostructureandanalysisofX-raypolefigureresult.Inas-quenchedsample,relativelyrandomdistributionofpolefigurewasdetectedwithoutshowingaspecifictexturecomponent.Inas-coldrolledsample,however,itisfoundwell-developedseveraltexturecomponentsconsistingofrotatedcube,α-fiberandγ-fibertexturecomponentswhicharefrequentlyobservedinbcc-structuredmetalsandalloyswerefound.Therefore,texturecomponentsdevelopedinthepresentalloysarecloselyrelatedtothedeformationofβ-phaseeventhoughsmallamountofα″phaseco-existinthemicrostructure.Inrecrystallizedsample,α-fibertexturecomponentisweaklydetectedwhiletheothertexturecomponents,rotatedcubeandγ-fibercomponents,appearstoberelativelyunchanged.Noadditionaltexturecomponentsweredetectedbesidesthosetexturecomponentsobservedinthecoldrolledsamples.

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简介：W-25Cualloysweremicrowavesinteredina2.45GHzmultimodeapplicator.Thedensification,microstructureandtheirdependenceonsinteringmodeandFeadditionwereinvestigatedindetail.Owingtothevolumetricheatingintrinsicinmicrowaveprocessing,amicrostructurewithlargerWgrainsizeincenterregionswasobservedasagainstlargergrainsizeinedgeregionsforconventionalsintering.Microwavesinteringdemonstratesitsintrinsicadvantagessuchasrapidheatingrate,densificationenhancementandmicrostructuralhomogeneity;butitundesirablypromotesWgraingrowth.Undermicrowavesintering,theroleofFeadditiononcompactconsolidationisnotsosubstantialasunderconventionalsintering.MoreoverFedegradesthemicrostructuralquality,generatingworseuniformityandcoarserWgrains.

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