外文翻译--复合材料mg2si-al的冷却斜槽法铸造和其局部重熔演化过程中的半固态微观结构 英文版.pdf外文翻译--复合材料mg2si-al的冷却斜槽法铸造和其局部重熔演化过程中的半固态微观结构 英文版.pdf

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MATERIALSSCIENCEANDENGINEERINGA444200799–103SEMISOLIDMICROSTRUCTUREOFMG2SI/ALCOMPOSITEBYCOOLINGSLOPECASTANDITSEVOLUTIONDURINGQDQIN,YGZHAO∗,PJSTREET,ACCEPTEDABSTRACTFABRICATEDMICROSTRUCTURE,,SIZETHATARESHAPEK1LOTMINIMIZINGANDSEMISOLIDOFTURENEEDEDISCONSTITUTEDOFSOLIDPHASEGLOBULESSUSPENDEDINTHELIQUIDPHASETHETHIXOTROPICEFFECTOFTHESEMISOLIDALLOYSALLOWSTHEMTOBEHANDLEDASAMASSIVESOLIDANDTOATTAINFLUIDLIKEPROPERTIESWHENSHEAREDDURINGSHAPING2MANYDIFFERENTROUTESSUCHSTRAINTIALRECENTLYSEMISOLIDKLEINERALLOGROFLOOFPROCESSALLOSPHERICALSUZUKITHIXOFORMINGINOFPOTENTIALASAUTOMOBILEBRAKEDISCMATERIALBECAUSETHEINTERMETALLICCOMPOUNDOFMG2SIEXHIBITSHASHIGHMELTINGTEMPERATURE,LOWDENSITY,HIGHHARDNESS,LOWTHERMALEXPANSIONCOEFFICIENTANDREASONABLYHIGHELASTICMODULUS8HOWEVER,09215093/DOIHAVEBEENUSEDTOPRODUCENONDENDRITICMICROSTRUCTURE,ASMAGNETOHYDRODYNAMICMHDSTIRRING,SPRAYFORMING,INDUCEDMELTACTIVATEDSIMA/RECRYSTALLISATIONANDPARMELTINGRAP,LIQUIDUS/NEARLIQUIDUSCASTINGETC3–8,CZERWINSKI9–11INVESTIGATEDTHEFABRICATIONOFMGALLOYSCOMPONENTSBYINJECTIONMOLDINGPROCESSETAL12STUDIEDTHEFORMATIONOFSEMISOLIDMG–AL–ZNYBYEXTRUDEDMETHODWUETAL13CONSTRUCTEDAMODELONWTHMORPHOLOGYOFSEMISOLIDMETALS,USINGSOLIDIFICATIONANDWSPEEDOFTHELIQUIDASVARIATIONSAFFECTINGTHEMORPHOLOGYCRYSTALSAMONGALLTHETECHNIQUESOFSSP,THECOOLINGSLOPE∗CORRESPONDINGAUTHORTEL864315094481;FAX864315095592EMAILADDRESSZHAOYGJLUEDUCNYGZHAOTHECOARSEREINFORCEMENTOFTHEPRIMARYMG2SIPARTICLESINTHENORMALCOMPOSITELEADSTOPOORPROPERTIESTHEREFORE,THECOMPOSITEWITHCOARSEPRIMARYMG2SIPARTICLESNEEDTOBEMODIFIEDTOOBTAINADEQUATEMECHANICALSTRENGTHANDDUCTILITYITHASBEENREPORTEDTHATRAREEARTHELEMENTSSUCHASCE16,SR17ANDITSSALTS18,19HAVETHEPOWERTOMODIFYTHEMORPHOLOGYOFPRIMARYMG2SIASEMISOLIDMICROSTRUCTUREINTHECOMPOSITEISEXPECTEDTOIMPROVETHEMECHANICALPROPERTIESTHESEMISOLIDOFMG2SI/ALCOMPOSITEHASBEENPRODUCEDVIASIMAINPREVIOUSSTUDY8HOWEVER,THISTECHNOLOGYISRELATIVECOMPLEXBECAUSEOFREQUIRINGCOLDEXTRUSIONANDDEFORMATIONLESSWORKHASBEENCARRIEDOUTONSEMISOLIDMG2SI/ALCOMPOSITEBYTHECOOLINGSLOPECASTANDPARTIALREMELTINGPROCESSINTHEPRESENTSTUDY,ASEMISOLIDOFINSITUMG2SI/AL–SI–CUCOMPOSITEWASPREPAREDBYTHECOOLINGSLOPECASTANDPARTIALREMELTINGPROCESS,–SEEFRONTMATTER2006ELSEVIERBVALLRIGHTSRESERVED101016/JMSEA200608074KEYLABORATORYOFAUTOMOBILEMATERIALSOFMINISTRYOFEDUCATIONJILINUNIVERSITY,NO142RENMINRECEIVED17APRIL2006;ANINSITUMG2SI/AL–SI–CUCOMPOSITEWITHSEMISOLIDSTRUCTUREWASANDEFFECTOFISOTHERMALHOLDINGTIMEONTHEMORPHOLOGYTHEMORPHOLOGYOFPRIMARYMG2SIANDH9251ALGRAINSINTHECOMPOSITEFACTOROFH9251ALGRAINSINCREASEWITHTHEISOTHERMALHOLDINGTIME2006ELSEVIERBVALLRIGHTSRESERVEDEYWORDSSEMISOLID;ALUMINUM;COMPOSITES;MICROSTRUCTURE;MAGNESIUMSILICIDEINTRODUCTIONITHASBEENWELLKNOWNTHATSEMISOLIDPROCESSINGSSPHASAOFSIGNIFICANTADVANTAGESOVERCONVENTIONALCASTING,SUCHASTHEMACROSEGREGATIONANDSOLIDIFICATIONSHRINKAGEREDUCINGTHEFORMINGTEMPERATURETHEKEYTHATPERMITSTHEALLOYSTOSHAPEISTHEABSENCEOFDENDRITICMORPHOLOGYTHESOLIDPHASE1THETYPICALNONDENDRITICMICROSTRUCPARTIALREMELTINGPROCESSCONG,WZHOU,BXUANDDEPARTMENTOFMATERIALSSCIENCEENGINEERING,CHANGCHUN130025,PRCHINA15AUGUST2006BYCOOLINGSLOPECASTANDPARTIALREMELTINGPROCESSTHEASCASTANDSHAPEFACTOROFTHEGRAINSWEREINVESTIGATEDTHERESULTSSHOWGLOBULARAND/ORELLIPTICAFTERPARTIALREMELTINGPROCESSTHESIZEANDISASIMPLEROUTETHEPRIMARYPHASEINTHESEMISOLIDYBYTHECOOLINGSLOPECASTHASBEENREPORTEDTOBECOMEAFTERREMELTEDINTHESEMISOLIDSTATE14HAGAAND14,15INVESTIGATEDTHEPRODUCINGPROCESSOFINGOTSFOROFAL–6SIALLOYSBYCOOLINGSLOPECASTINGHYPEREUTECTICAL–SIALLOYSWITHHIGHMGCONTENTISINFACTANSITUALUMINUMMATRIXCOMPOSITESCONTAININGALARGEAMOUNTHARDPARTICLESOFMG2SI,ANDTHEMG2SI/ALCOMPOSITEHASA100QDQINETAL/MATERIALSSCIENCEANDENGINEERINGA444200799–103TABLE1CHEMICALCOMPOSITIONSOFTHEMG2SI/ALCOMPOSITEWTMATERIALSALMGSICUCRZNNIFEAL–SI–MG–CUBAL132761128135230005002300010325FIG1TECHNICALSCHEMATICDIAGRAMOFTHECOOLINGSLOPECASTANDPARTIALREMELTING,ADOPTEDFROM15ANDTHEEFFECTOFISOTHERMALHOLDINGTIMEONTHEMICROSTRUCTUREOFTHECOMPOSITEWASINVESTIGATED2INGOT,WEREAL–SIELECTRICOF680–700STEELPRODUCEICALCASTINGSEQUENTLY12PERFORMEDUP600PROCEDUREOPTICALSOLUTIONSIZEANDAREAOFTHEPRIMARYSOLIDPHASEWEREANALYZEDSTATISTICALLYBYAQUANTITATIVEANALYSISSYSTEMOMNIMETIMAGINGSYSTEMSBUEHLER,USA3RESULTSANDDISCUSSIONACCORDINGTOTHECOMPOSITIONOFTHEALLOYANDTHEPREVIOUSSTUDIES8,16,THEASCASTMICROSTRUCTUREOFTHECOMPOSITECONSISTSOFMG2SI,H9251ALANDEUTECTICSIPHASESFIG2AANDBSHOWSTHETYPICALASCASTMICROSTRUCTUREOFINSITUMG2SI/ALCOMPOSITEBYTHENORMALCASTANDCOOLINGSLOPECAST,RESPECTIVELYTHEMICROSTRUCTUREOFTHECOMPOSITEREVEALSTHATTHEMORPHOLOGYOFPRIMARYMG2SIASCASTINTHECOMPOSITEBYTHENORMALCASTWASDENDRITICASINDICATEDWITHAARROWINFIG2A,WITHASIZEOF∼COMPOSITEPHASEDENDRITICMGREASONINISWILLCONTURESHOLDING600MGSHAPE,HAHOLDINGPARTICLESMORPHOLOGYOFSMALLERLIQUID,EXPERIMENTALPROCEDURECOMMERCIALAL–13WTSIMASTERALLOYINGOT,PURECU997PURITYANDMAGNESIUMINGOT,980PURITYUSEDTOPREPARETHEEXPERIMENTALALLOYABOUT520GOFMASTERALLOYMELTWASMOLTENINAGRAPHITECRUCIBLEINANRESISTANCEFURNACEABOUT100GOFMAGNESIUMAND26GCU,PREHEATEDAT300◦C,WEREADDEDINTOTHEAL–SIMELTAT◦CAFTERHOLDING15MIN,THEMELTWEREPOUREDINTOAMOLDVIAAALU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本文标题:外文翻译--复合材料mg2si-al的冷却斜槽法铸造和其局部重熔演化过程中的半固态微观结构 英文版.pdf
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