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1.
1.IntroductionHightemperaturetitaniumalloysforuseingasturbineengines,airframesandotherapplicationshasexperiencedalongtime.Thehighstrengthtodensityratiooftitaniummakesitaveryattractivedesignchoiceinenergyefficienthighthrusttoweightengines.Tita…  相似文献   

2.
1IntroductionTherearealotofnonmetallicmaterialssuchasceramics,fiberreinforcedplasticsandvariouswoodbasedproducts,nonferrousmetalsandalloys,andcompositeswhichcannotbemachinedusingcementedcarbidecuttingtools.Withthecontinualdevelopmentsandengine…  相似文献   

3.
1 INTRODUCTIONZincbasedcastalloyscontainingahighconcentrationofaluminumandsomecopperhavebeenfoundtobeeconomicalandeffectiveforsubstitutesforbronzeinavarietyofgeneralengineeringwiththeirexcellentcomprehensivemechanicalpropertiesandwearresistance…  相似文献   

4.
1.IntroductionBoronisaveryeffectiveliquidphasesinteringadditivetoiron〔1-2〕.TheFeBCphasediagramshowsaternaryeutecticreactionoccurringat1097℃〔3〕.AdditionofFeBandFeCmasteralloypowderstoFeMoBCsinteredsteelscanactivatethesinteringprocessbyliquidpha…  相似文献   

5.
1 INTRODUCTIONAlrichNi3Al(stoichiometricandhyperstoichiometric)issuperiortoNirichNi3Alasahightemperaturematerial.ItisconsiderablystrongerthanNirichNi3Alathightemperature[1].Inaddition,AlrichNi3AlismoreresistanttooxidationthanNirichNi3Albecaus…  相似文献   

6.
1-IntroductionTheSi3N4ceramicasahightemperaturestructuralmaterialhasattractedanextensiveattentionlongago,andwasextensivelystudiedin70′sinUSA,UK,GermanyandJapan,butthefieldsofapplicationwererestrictedbecauseitsstrengthdramaticallydescreasesatabo…  相似文献   

7.
1.IntroductionInlaboratory,sputteringmagnetoopticalfilmisoftenobtainedbyusinginlaidtargetandtherelationshipsamongcomposition,sputteringparametersandmagnetoopticalpropertiesarestudiedbyvaryingsputteringparameters〔12〕.However,inthepracticalmagneto…  相似文献   

8.
1.IntroductionAlLibasedalloysareaginghardenedalloys,theirmechanicalpropertiesdependtoaconsiderableextentonphasetransformationprocess.Intherecentyears,investigationontheprocessofagingtransformationinAlLibasedalloymainlyconvergesontheinitialstageo…  相似文献   

9.
1.PrefaceForFeMnSialloyfamily,γ→εmatensitictransformationissemithermoplastic,andstructureoftheparentphaseisdisordered.ThemechanismofshapememoryofthiskindofalloyisdifferentfromthatofNiTiandCubasealloy.theshapememoryeffectoftheFeMnSialloyfamilyor…  相似文献   

10.
1.IntroductionSinceIijimadiscoverednanocarbontubein1991.Theseonedimensionalnanomaterialshaveimportantbasestudyvalueandpotentialapplicationvaluebecauseoftheirspecificstructurecharactersandnewphysicalpropertiesdissimilartothebasematerials,nowtheyar…  相似文献   

11.
1 INTRODUCTIONTheAB2typeZrbasedLavesphasehydrogenstoragealloyshavebeenstudiedextensivelyduetotheirhighcapacity,longcyclelifetimeandthepotentialtobecomeapromisingcandidateforAB5typealloysinNiMHbatteries[1,2].UnlikethecommonAB5typehydrogenstorag…  相似文献   

12.
1.Introduction45steelisusedwidelyinChina.Theprocessisasusualthefollow:forgingmachiningroughlyquenchingtemperingathightemperaturemachiningfinely.Consumingenergyandbadsurfaceconditionarethemajordefectsofthisprocess.Sometimesthefine,homogeneousaust…  相似文献   

13.
Structural evolution of non-dendritic AlSi7Mg alloy during reheating   总被引:3,自引:0,他引:3  
1 INTRODUCTIONMetalforminginthesemisolidstateisnowbecominganewgenerationmetalformingprocessforitseasytorealizenearnetshapeforming,prolongedmoldlife,reductioninsolidificationshrinkage,porosityandsegregation,aswellasitsnondendriticmicrostructurean…  相似文献   

14.
1.IntroductionIthasbeenreportedthatFeMnSiCrNishapememoryalloysexhibitnotonlyagoodshapememoryeffect(SME),butalsoagoodcorrosionresistance〔1,2〕,comparedwithFeMnSialloys.Furthermore,itcanbeusedinmanufacturingpipecouplingsbecauseofitshighphasetransf…  相似文献   

15.
1.IntroductionMuchworkhasbeendoneontheeffectsofmicroalloying〔14〕,solidsolutionandagingtreatment〔2,46〕,andgrainboundaryprecipitation〔2,4,7〕onelevatedtemperaturemechanicalpropertiesofrefractoryalloys.Tomeasurecomplexmechanicalpropertiesofarefractor…  相似文献   

16.
RECRYSTALLIZATION IN A SPINODAL Cu Ni Fe ALLOY   总被引:1,自引:0,他引:1  
1.IntroductionNanometergradetwophasemicrostructurecouldbeachievedthroughspinodaldecomposition〔1〕,andmagnetismofpermanentmagnetmaterialCuNiFewasimprovedbySpinodaldecomposition〔2〕.However,nosystematicstudyonthechangesduringagingtreatmentofthesolut…  相似文献   

17.
1IntroductionTherelativelynewmetastableβtitaniumalloy(β21S)hasfoundincreasingapplicationsinaerospaceprograms,especiallyinmetalmatrixcompositesinfuturehypersonicvehiclesforitsattractivecombinationofproperties.Theβ21Salloyisstripproducible,coldr…  相似文献   

18.
1 INTRODUCTIONBothcompositionandprocessrouteareimportantfactorsindeterminingthepropertiesofTiAlbasedalloysandithasbeenshownthroughanumberofstudiesthatrefinementofthestructureisaveryefficientwaytoimproveproperties[1].Inthecaseofcastalloystheuseof…  相似文献   

19.
1IntroductionDendrimerligandsareasortofimportantpolyfunctionalcomplexantshavinghighlyorderlyspatialstructureandinnercavitieswithdefinitesize,andithasbeenfoundthattheyhavemanypotentialapplications,suchasmoleculerecognitionagents,highlyeffectiveex…  相似文献   

20.
1 INTRODUCTIONTherearetwokindsofmechanismofdezincificationinbrass[1].Oneisdissolutionresedimentationandtheotherispreferentialsolutionofzinc.Cooperationofbothmechanismsisalsoreported.Pickeringetal[2]pointedoutthatpreferentialdissolutionofzincinbr…  相似文献   

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