等径道角挤压预变形AZ61镁合金在半固态等温处理中的微观组织演变（英文）.pdf

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1、Availableonlineat、^，ww．sciencedirect．corn一Transactioilsof晦黪ScienceDirectNonferrousMetals黉SocietyofChinaEIS]巨VIERPressTrans．NonferrousMet．Soc．China22(2012)555—563WWW．tnmsc．cnMicrostructuralevolutionofAZ61magnesiumalloypredeformedbyECAEduringsemisolidisothermaltreatmentJIANGJu．f

2、u一，LINXin，WANGYing，QuJian-jun，LUOShou-jing1．SchoolofMaterialsScienceandEngineering，HarbinInstituteofTechnology,Harbin150001，China；2．StateKeyLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity,Xi’an710072，China；3．SchoolofMechatronicsEngineering，HarbinInstit

3、uteofTechnology,Harbin150001，ChinaReceived15September2011；accepted30November2011Abstract：ThemicrostructuralevolutionofAZ61magnesiumalloypredeformedbyequa1channelangularextrusion(ECAE)duringsemisolidisothermaltreatment(SSIT)wasinvestigatedbymeansofopticalmetalloscopyandimageana

4、lysisequipment．TheprocessinvolvedapplicationofECAEtoas—castalloyat310。Ctoinducestrainpriortoheatinginthesemisolidregionfordifferenttimelengths．Theresultsshowthatextrusionpass．isothermaltemperatureandprocessingroutehaveaninfluenceonmicrostructuralevolutionofpredeformedAZ61magne

5、siumalloyduringSSITWiththeincreaseofextrusionpass．thesolidparticlesizeisreducedgradually．WhenisotherlTlaltemperatureincreasesfrom530。Cto560。C．theaverageparticlesizeincreasesfrom22Bmto35I．tm．Whenisothermaltemperatureis575。C．theaverageparticlesizedecreases．Theparticlesizeofmicro

6、structureofAZ6lmagnesiumalloypredeformedbvECAEatBrdaringSSITisthefinest．Keywords：AZ61magnesiumalloy；semisolidisothermaltreatment：equa1channe1angularextrusion；microstructuralevolutionthixoformingprocess．Researchonpreparationofthe1IntrOductiOnsemisolidingotsandthemicrostructural

7、evolutionofsemisolidingotsrslurries)hasbeendonebysomeThecombinationoflowdensity,highspecificresearchersduetotheimportancetothequalityofthestrengthandstiffness，andexcellentdampingcapacityfinalthixoformedparts．Variousrouteshadbeenqualifiesmagnesiumalloyasidealmaterialsfordevelop

8、edforfabricatingthenon．dendriticspheroidallightweightconstruc