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1.
Influence of grain size on mechanical properties of isostatically pressed beryllium materials 总被引:1,自引:0,他引:1
1 INTRODUCTIONBerylliumhasitsowncharacteristics:lowdensi ty,highmeltingpoint ,highelasticmodulus ,espe ciallyhighspecificstiffness (modulus/density) ,gooddimensionalstability ,etc .Soitisagoodmaterialforinertialguidancesystemandopticalsystem[1~ 3 ] .Powdermetallu… 相似文献
2.
LI Yuan yuan 《中国有色金属学会会刊》2000,10(3)
1 INTRODUCTIONHypereutecticAlSialloyisusedextensivelyaspistonmaterialsduetoitslowcoefficientofthermalexpansionandhighthermalstability.ThekeyfactorwhichinfluencesthepropertiesofhypereutecticAlSialloysisthecoarseprimarysiliconphase,andmuchresearchworkha… 相似文献
3.
Refinement and thermal analysis of hypereutectic Al-25%Si alloy 总被引:1,自引:0,他引:1
1 INTRODUCTIONThehypereutecticAl Sialloysexhibitahighlydesirablecombined properties ,suchascastability ,highstrength to weightratio ,lowthermalexpansioncoefficient,highcorrosionandabrasionresistances .SothehypereutecticAl Sialloyshavewidespreadus ageinautomo… 相似文献
4.
1 INTRODUCTIONTibasedIrO2 coatinganodeswerewildlyusedinelectrochemicalindustryfortheirhighelectrocatalyticactivityandstability[1] .Inanextremecondition ,suchashigh speedelectrodeposition ,however ,thestabilityofIrO2 isnolongersatisfied .Therefore ,themodificat… 相似文献
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1 INTRODUCTIONAsoneofthealternativesofThO2 Wcathode ,La2 O3 Mothermioniccathode (La Mo)appearedinrecent 30 years[1~ 4 ] .Althoughthiscathodehasgoodemissivity ,ithasnotbeenusedcommerciallybecauseofitspooremissionstability[5~ 8] .Themicrostructurestudyonthiscathodesho… 相似文献
6.
Eigen elastic mechanics and its variation principle 总被引:3,自引:0,他引:3
郭少华 《中国有色金属学会会刊》2001,(2)
1 INTRODUCTIONTheconceptionofeigenelasticmechanicsbenefitsfromthestandardspacetheory[1~ 4] .Aseriesofstud ies[5~ 7] madebyauthorrecently ,haveestablishedtheeigenformofelasticmechanicsundermechanicalrepre sentationanditsoperationalizedprinciple,butthecorrespon… 相似文献
7.
INTRODUCTIONAl Pbhypermonotecticalloyisanewtypebear ingmaterial[1] .Greatemphasishasbeenputonites peciallysince 1990s[2~ 4 ] .PbhasexcellentlubricatingpropertywhichcanmatchthatofSn ,butitscostismuchlowerthanthatofSn ,soAl SnalloyisreplacedbyAl Pballoyinthefieldo… 相似文献
8.
1 INTRODUCTIONRockisahighlynonlinearmedium ,whosebe haviorcanbecategorizedintoaninitiallinearresponsefollowedbyplasticortheweakenedphaseafterat tainingthepeakstress[1 ] .Traditionally ,theaveragemodulusofrockistakenas 50 %ofelasticmodulusofthepeakstressintrad… 相似文献
9.
1 INTRODUCTIONMetal plasticdeformationresistanceisoneofthebasicparameterofrollingprocessandequipmentpa rameter[1,2 ] .Theeffectofthedeformationconditionsondeformationresistanceisdifficulttocountandana lyzebymeansoftheoreticalmethodbecausethemetalplasticflo… 相似文献
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1 INTRODUCTIONBoundarylubricationandthin filmlubricationaretwolubricatingstateswidelyexistinginmetalplasticworkingprocess .In 1919Hardyetal[1] firstadvancedtheconceptofboundarylubrication ,in192 9Tomlinson[2 ] disclosedtheintermoleculareffectofboundarylubricatio… 相似文献
11.
TU Hai ling 《中国有色金属学会会刊》2000,10(3)
1 INTRODUCTIONTibasedhydrogenstoragealloysbecameattractivebecauseoftheirlargehydrogencapacities.Bernaueretal[1]andLietal[2]pointedoutthatmultielementTibasedhydrogenstoragealloysaremorepromisingmaterialsforpracticalapplications.(TiZr)(MnCrVFe)2alloyisacommon… 相似文献
12.
Thermal debinding dynamics of novel binder system 总被引:2,自引:0,他引:2
1 INTRODUCTIONBinderplaysafoundationalpartofincreasingflowandkeepingshapesinthe plasticizing powderextrusionmolding processes[1] .Now ,newbindersystems[2~ 9] aredesignedwithmutli componentsoastochangetherheologicalpropertiesandthermalde bindingbehaviorsofbind… 相似文献
13.
1 INTRODUCTIONCu basedshapememoryalloys (SMA )werestudiedbymanyauthorsinrecentyears[1~ 13 ] .Itisconvincedthattheshapememoryeffectisass 相似文献
14.
1 INTRODUCTIONHybridformingisanewmethodformanufactur ingofmetalsheetandplasticcombinedmacro com positecomponents[1] .Twometalsheetswith pre treatedsurfacesareheldtogetheralongtheiredgesbyclampingoperationofthemoldforhybridformingthroughtheinjectionmachine … 相似文献
15.
1 INTRODUCTIONCopperbaseshapememoryalloyshavelowcostsand goodshapememoryproperties .Theirshapememoryeffectsoriginatefromthermo elasticmarten sitictransformations .Alotofworkhasbeendoneonthemartensitictransformations[1,2 ] ,martensiticstructures[3~ 5] ,ageingeff… 相似文献
16.
1 INTRODUCTIONWiththedevelopmentofcomputertechnologyandartificialintelligence ,newmethodshavebeenap pliedtoimprovecastingproduction[1] .Expertsystemisanimportantbranchofartificialintelligence ,itisessentiallyancomputer programwith“intelligent”characteristi… 相似文献
17.
Effects of technological parameters on microstructures and properties of in situ TiC_p/Fe composites 总被引:2,自引:0,他引:2
1 INTRODUCTIONTiCiswidelyusedasinsitureinforcingparticleinmetalmatrixcomposites[1~ 5] ,becauseithasnotonlyhighmelting point ,hardness,elasticmodulusandexcellentcorrosionresistance,butalsomoreneg ativestandardGibbsformationfreeenergy .Inrecentstudies[6~ 9] ,howe… 相似文献
18.
1 INTRODUCTIONAcontinuousrecoveryandrecrystallizationmechanism[1,2 ] wasproposedbyLinandcoworkersforthesuperplasticityinlarge graine 相似文献
19.
1 INTRODUCTIONDiesplayanimportantroleinmodernmanufac turingindustry .Newprocessingtechniques[1] arebe inginnovateddayandday ,suchassparkerosion ,ul trasonicandelectron beammachining ,superplasticformingandsoon .Theirapplicationhasremarkablyimprovedtheefficien… 相似文献
20.
1 INTRODUCTIONFunctionallygradedmaterials(FGM )isanewkindofnon homogeneouscomposites[1] .Widespreadattentionhasbeenpaidtosuchkindofmaterialsforitssuperiorcharacteristicsandnoveldesignideasandimportantapplicationbackground .Itiswellknownthatformationprocess… 相似文献