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简介：Solidificationstructurevariationofsinglephasealloywithundercoolingpriortonucleationhasbeenwidelystudied.Theprogress,especiallyduringthelastdecade,isreviewedsoastogiveacomprehensiveknowledgeforit,inwhichtheemphasesarelaidonthestructureevolutionmechanismandthepotentialapplication.Lastly,thefutureinterestingsubjectsarepresented.

简介：Mg-Caalloyshavebeenproposedtobeanewcandidateforbiodegradablemetalmaterialsinthepresentstudy.Mg-1Ca,Mg-5CaandMg-20Ca(wt%)havebeenpreparedandtheprimarypropertiesrelatedtotheirbiomedicalapplicationhavebeeninvestigatedbyX-raydiffraction,SEMobservation,tensile,electrochemicalandimmersiontests.TheexperimentalresultsshowthatwiththeincreaseofCaconcentration,theworkingabilityofMg-Caalloybecomesworse.OnlyMg-1CaandMg-5Caalloyspecimenscanbehotrolledi...

简介：DensityofmoltenNiandNi-Walloyswasmeasuredinthetemperaturerangeof1773～1873Kwithasessiledropmethod.ThedensityofmoltenNiandNi-Walloystrendstodecreasewithincreasingtemperature.ThedensityandmolarvolumeofthealloystrendtoincreasewithincreasingWconcentrationinthealloys.ThecalculationresultshowsanidealmixingofNi-Walloys.

简介：1.IntroductionLightrareearthadditioncanremarkablyenhancetheservicelifeofFe-Cr-Alalloyforelectricalheatingelement,butitscontentinthealloymustbecontrolledbelowthelevelof0.1wt-%.Whenthecontentexceedsthat,theperformance

简介：基于成核底层被激活由的假设在冷却下面宪政在起始的团结期间由邻近的谷物生长和溶质分发产生了，为有谷物精炼的铝合金的谷物尺寸的计算的一个模型被开发，在成核被二个参数统治的地方，i.e.growth限制因素Q并且在使参数P.The生长凉下来下面，限制因素Q与起始的率成正比在使开发和罐头凉下来下面宪政与强壮的潜在的成核粒子在合金直接被用作谷物精炼的一个标准。undercoolingparameterP能被认为是最大值在使三角洲T_c.For弱潜在的成核粒子凉下来下面宪政，RGS的使用将是更精确的。纯铝和AISi7合金的谷物精炼的试验性的数据是重合的与模型一起预言了结果。

简介：Theinfluenceofthevolumefractionoftemperedmartensiteonmagnetomechanicaldampingoftheferriticmatrixindual-phasealloyswasstudied.Theexperimentalresultsshowedthat（1）dual-phasedampingalloyisofgoodcombinationofstrengthandtoughness:（2）gooddampingca-pacity(Q-1≥5.0×10-3)canbeobtainedindual-phasealloysonlywhenthevolumefractionoftemperedmartensitewascontrolledproperly.Theeffectofmartensiteonmagnetomechanicaldamp-ingoftheferriticmatrixwasanalysed.Thedampingcapacityofdual-phasealloyswasrelatedtothevolumefractionVmoftemperedmartensitebyQ^{-1=Q-1（1-Vm/1+BVm）atsmallvibrationstrainamplitudesεA≤5.0×10-6.}

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

简介：Thedevelopmentofthermalanalysistechniquesforevaluationofcastalloymeltqualityanditscurrentapplicationsinthefoundrywerereviewed.Thecharacteristicsofthecurrentthermalanalysistechniqueswereanalyzed.Anewcomprehensivemethodforcoolingcurverecognitionhasbeenproposed.Theevaluationofcastalloymeltqualitywasrealized.

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

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简介：TheX-raydiffractionpeak-shiftmethodwasintroducedintothedeterminationofdeformationfaultprobability(α)ofFe-Mn-SialloyswithvariousMncontentsandthermomechanicalcyclingnumbers.Thepreciselatticeconstantsrequiredwereobtainedbynumericalcalculationinsteadofusingstandardsamplewithoutanyfault.Theinfluenceofinternalstressonthedeterminedαhasbeenevaluated,andthecausedrelativeerrorwasdeterminedasabout4%andthusnegligible.TheresultsshowthatthedeformationfaultprobabilityincreaseswithdecreasingMn-contentandincreasingcyclenumber,whicharequalitativelyconsistentwiththoseresultsofPsfdeterminedbypeak-broadeningmethod.

简介：InthisstudyweconductedsingleV-groovebuttwelding(GTAW)onthreetypesofheattreatablealuminumalloys2024-T351,6061-T6and7075-T6andcomparedtheangulardistortionlevelsofthethreealuminumalloysatdifferentVeepreparationangleswithorwithoutrestraint.ExperimentalresultsdemonstratedthatwhentheVeepreparationanglewas0°(I-shapedgroove),theangulardistortionleveloftherestrainedweldmentcanexceedthatoftheunrestrainedweldments.Moreover,whentheVeepreparationanglewas45°,60°or90°,therestrainedweldmenthadlowerangulardistortionthantheunrestrainedweldments.ThesingleVeepreparationangle(amountoffillermetal)inbuttweldingaffectedtheangulardistortionoftheweldment.Withoutrestraint,theangulardistortiontendedtoincreasewiththesingleVeepreparationangle.Meanwhile,theangulardistortiontendedtodecreasewhenthesingleVeepreparationanglewas60°.Additionally,arestrainedweldmenthadhighangulardistortionwhenthesingleVeepreparationanglewas0°.Notably,theangulardistortiontendedtoreducewithincreasingsingleVeepreparationangle.Theangulardistortionoftheweldmentwasminimizedatanangleof60°.However,theangulardistortionincreasedwhentheVeepreparationangleexceeded60°.Thehigh-temperatureyieldstrengthofamaterialalsoaffecteditsangulardistortion.Angulardistortionincreasedwithhigh-temperatureyieldstrength.Experimentalresultsalsoshowedthat,fromthestrongesttotheweakest,thehigh-temperatureyieldstrengthofthethreetypesofaluminumalloysfollowedtheorder6061-T6and2024-T351>7075-T6.

简介：DropletsofCo-37.6wtpctMoandNi-47.7wtpctMoeutecticalloyswererapidlysolidifiedduringcontainerlessprocessingina3mdroptube.Akindofanomalouseutecticappearsinthesetwoeutecticalloyswhenundercoolingisbeyond56and61K,respectively.Thetwoeutecticphasesinanomalouseutecticwereobservedtogrowindendritemanner.Theformationofanomalouseutecticisascribedtothecooperativedendritegrowthofthetwoindependentlynucleatedeutecticphases.Currentdendriteandeutecticgrowththeoriesareappliedtodescribetheobservedprocesses.

简介：AseriesofDy(Gd)-basedbulkamorphousalloyrodswerepreparedbywater-cooledcoppermoldmethod.ThermalstabilityandstructureofDy-Gd-Co-AlalloyswereinvestigatedbydifferentialscanningcalorimetryandX-raydi-raction,respectively.TheresultsshowthattheDy-Gd-Co-Alalloyshavegoodglass-formationability,andtheDy31Gd25Co20Al24alloycanbereadilycastintofullglassyrodsupto5mmindiameter.Theglass-formingabilityofmulticomponentalloyswasgreatlydependentontheirchemicalinteractionandtheequivalentbondparametersamongatomssuchasequivalentelectronegativitydierence,equivalentatomicsizeparameter.TheDy(Gd)-basedbulkamorphousalloyscouldbeexpectedaspotentialfunctionalmaterials.

简介：AresearchonkineticsofAlevaporationfromliquidU—Alalloyswasmadeinavacuuminductionmelting（VIM）furnaceat1673—1843K.TheevaporationrateofAlwasfoundtobefirstorderwithrespecttoAlcontentinthemelt.TheoverallmasstransfercoefficientofAlwasdeterminedanditwasfoundthattheevaporationrateofAlincreasedwithincreasingtemperatures.TheapparentactivationenergyofAlevaporationat1673-1843Kwas171.5kJmol-1.ThevalueofmasstransfercoefficientofAlintheliquidphasewasestimatedtobe3.77×10-6,7.41×10-6,and9.40×10-6ms-1at1673,1753,and1843K,respectively.Meanwhile,ratedeterminingstepswerediscussedanditwasconcludedthattheevaporationrateofAlismainlycontrolledbyliquidphasemasstransfer.

简介：Themicrostructuralfeatures,shapememorybehaviorandmechanicalpropertiesofNi-Mnbasedalloyswereinvestigatedbydierentialscanningcalorimetry(DSC),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)andthermalcyclingtestundervariousstresses.ThetransformationtemperaturesshiftedtowardlowertemperatureswhenaddingathirdelementintotheNi-Mnsystem.Theadditionof10at.pctFeincreasedconsiderablythemechanicalpropertiesexhibitingstillhightransformationtemperatures.However,itwasfoundthatinNiMn40Fe10alloythemartensitictransformationisnotthermoelasticinnature.ThemechanismofthistransformationandthecrystallographyofNi-Mn(50-x)-Fex(x=5,7,10,20at.pct)alloysarepresented.

简介：与优秀biomechanical相容性开发新钛合金是一个重要研究方向外科植入材料。现在的纸总结生物医学的钛合金的国际研究和开发。瞄准增加biomechanical相容性，它也介绍合金设计的探索和改进，机械处理，微观结构和阶段转变，并且以后最后为关于生物医学的钛合金的科学研究构画出方向。