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AlMo_(0.5)NbTa_(0.5)TiZr难熔高熵合金微观组织及力学性能研究.docx

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AlMo_(0.5)NbTa_(0.5)TiZr难熔高熵合金微观组织及力学性能研究 Title:MicrostructureandMechanicalPropertiesInvestigationofAlMo(0.5)NbTa(0.5)TiZrRefractoryHighEntropyAlloy Abstract: Refractoryhighentropyalloys(RHEAs)areaclassofmetallicmaterialscharacterizedbytheirexcellenthigh-temperaturestrengthandresistancetooxidationandcorrosion.Inthisstudy,themicrostructureandmechanicalpropertiesoftheAlMo(0.5)NbTa(0.5)TiZrRHEAwereinvestigated.Thealloywaspreparedbyarcmeltingandcharacterizedusingvarioustechniques,includingscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),X-raydiffraction(XRD),andmechanicaltesting.Theresultsdemonstratedacomplexmicrostructureconsistingofabody-centeredcubic(BCC)solidsolutionphasewithprecipitatesofvarioussizesandgrainboundarieswithdifferentdistributions.Furthermore,theAlMo(0.5)NbTa(0.5)TiZralloyexhibitedsuperiormechanicalproperties,includinghighyieldstrengthandfracturetoughness,makingitapotentialcandidateforhigh-temperatureapplications. 1.Introduction: Refractoryhighentropyalloys(RHEAs)havegainedsignificantattentionduetotheirexceptionalmechanicalpropertiesathightemperatures.ThecombinationofrefractoryelementsinequimolarornearlyequimolarratiosinRHEAspromotestheformationofasimplesolidsolutionphase,leadingtouniqueproperties.AmongvariousRHEAs,theAlMo(0.5)NbTa(0.5)TiZralloyhasshownpromiseforhigh-temperatureapplicationsduetothepresenceofrefractoryelements,aluminum,andtitanium.ThispaperaimstoanalyzethemicrostructureandmechanicalpropertiesoftheAlMo(0.5)NbTa(0.5)TiZralloytogaininsightsintoitssuitabilityforhigh-temperatureapplications. 2.ExperimentalMethods: TheAlMo(0.5)NbTa(0.5)TiZralloywaspreparedbyarcmeltingtheconstituentelementsunderanargonatmosphere.Theas-castsamplewasfurtherhomogenizedbyannealingatahightemperaturetoeliminateanysegregationandtoobtainahomogeneousmicrostructure.Themicrostructurecharacterizationwasperformedusingscanningelectronmicroscopy(SEM)formacrostructureobservationandtransmissionelectronmicroscopy(TEM)fordetailedmicrostructuralanalysis.X-raydi