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    CONTENTS

;Co-SponsoredbytheFoundryInstitute

    ;ofChineseMechanicalEngineering

    ;.Society

    ;SPECIALCASTING&NONFERROUSALLOYS

    ;Vo1.28No.72008Monthly(Series:No.184) ;CoNTENTS&ABSTRACTS

    ;LowCycleFatigueBehaviorandItsMechanismofAl

    ;7Si-0.3MgAlloyMoDefeng,HeGuoqiu,Zhu

    ;Zhengyu,HuZhengfei,Liu×iaoshan,Zhang ;Weihua(1.Schoo1ofMaterialsScienceandEngineer

    ;ing,TongjiUniversity,Shanghai,China;2.State ;KevIaboratoryofTractionPower,SouthwestJiao

    ;tongUniversity,Chengdu,china)2008,28(7)493

    ;495

    ;AbstractLowcyclefatiguebehaviorofA17Si0.3Mg

    ;alloywasexaminedbymechanicalfatiguetestingwith ;equivalentstrainamplitudevariedfrom0.15%to ;O.35%,andthedislocationevolutioninthespecimens ;wasobservedbyTEM(transmissionelectronmicro

    ;scope).Theresultsindicatethatthedislocationstruc

    ;tureiscloselydependentonstrainamplitude,andthe ;densityofdislocationinfailurespecimensisincreased ;withincreasinginequivalentstrainamplitude.Cyclic ;hardeningcanbefoundasaresultofthedislocation ;interactionandparticlepinning,andhardeningregion ;canbeenthroughouttheentirefatigueprocesswith ;thestrainamplitudemorethan0.35%.Fatigue1ifeis ;decreasedwiththeincreaseoftheequivalentstrain ;amplitude,confirmingtotheequationoftheManson

    ;Coffin.

    ;KeyWords:CastAIAlloy,LowCycleFatigue,Disloca

    ;tion

    ;ApparentViscosityofInsituSynthesizedParticulate ;ReinforcedAluminumMatrixCompositesLiGuir0na, ;ChenRuilong,ZhaoYutao,WangHongming,Chen ;Gang,DaiQixun,ChengXiaonong(SchoolofMate

    ;rialsScienceandEngineering,JiangsuUniversity, ;Zhenjiang,China)2008,28(7)496498

;AbstractIn-situ(A13Zr+A12O3)/A1particulaterein

    ;forcedaluminummatrixcompositeswassynthesized ;bydirectmeltreactionmethodinA1Zr(CO)system

    ;withthereinforcedparticulatesizeof0.53”m.The

    ;apparentViSCOSityoithecompositesmeltduringsyn

    ;thesizedprocesswasmeasuredwithrotarycylinder ;method.Theresultsindicatethatapparentviscosity

     ;viatimecurvesofthecompositeswith5%particlevol

    ;umetricfractionbelongstoaparabolicone,andkeeps ;aconstantvalueof0.75Pa?safter25minandistwo ;timeshigherthanthatof0.24Pa?sofpurealumi

    ;hum,whichisattributedtotheuniformanddispersive ;

    ;1\

    ;distributionofmicronparticulateincomposites.Melt ;apparentviscosityofthecompositeswith15%particu

    ;1atevolumetricfractionisincreasedwiththeincrease ;oftime,andtheparticulateaggregationcanbeob

    ;servedinthemicrostructure.

    ;KeyWords:ApparentViscosity,ParticulateReinforced ;AluminumMatrixComposites

    ;MicrostructureandMechanicalPropertiesofEqual- ;channelAngularPressedAZ31MagnesiumAlloyFeng ;Xiaoming,AiTaotao,ZhangHui(DepartmentofMa

    ;terialsScienceandEngineering,ShaanxiUniversityof ;Techology,Hanxhong,China)2008,28(7)4995O1

    ;AbstractEffectsofthepressingpassesonthemicro

    ;structureandmechanica1propertiesofAZ31magnesi

    ;umalloyduringequalchanne1angularprissing

    ;(ECAP)wereinvestigatedbyXraydiffractionand

    ;optica1microscope.Theresultsindicatethatwithin

    ;ceasinginthepressingpasses,elongationofthealloy ;isincreasedandthetensilestrengthisdecreasedasa ;resultoftherefinementofgrainsize.After8passes, ;grainsizeinthealloyisdecreasedfrom12Ogmto9 ;“m,whichisresponsibleforthedeformationmodeofa

    ;phasefromtwininginthefirstpassestothedisloca

    ;tionslipinthefollowingpasses.Afterpressing,the ;dispersiveorientationof(0001)crystalfaceinfluences ;thetensilestrengthofalloy.Increaseofelongationis ;attributedtotherefinementeffectsandtheactivation ;ofslidingplane.KeyWords:MagnesiumAlloy,ECAP, ;Microstructure,Mechanicalproperties

    ;OptimizationofElectrolyteFormulaofMicro-arcoxi-

    ;dationforMg9Gd3Y0.6Zn0.5ZrMagnesiumAlloy ;inAluminateSolutionWangPing,LiJianPing,Ma ;Qun(DepartmentofMaterialsandChemica1Engineer

    ;ing,XianTechnologicalUniversity,Xian,China)

    504 ;2008,28(7)5O2

    ;AbstractTheMg9Gd3Y0.6Zn0.5Zrmagnesiumal

    ;loywastreatedbymicro——arcoxidationinaluminiteso——

    ;1ution.andmorphologyandcorrosionresistanceofox- ;idecoatingatdifferentelectrolytewereinvestigatedby ;SEM(scanningelectronmicroscope),Xrayandelec-

    ;trochemica1testing.Theresultsindicatethatthecor

    ;rosionresistanceofthealloycanbegreatlyimproved ;byMAOtreatment.Theoptimizedprocessingparam

    ;etersasfollows:NaA1O2of5g/L,H2O2of1OmL/L, ;

    ;KFof6g/L,glycerineof15mI/L.Thecoatingwith ;uniformthicknessconsistsofMgO,A12O3and ;MgA1204aswellasalittleMgF2phase.

    ;KeyWords:Micro-arcOxidation,MagnesiumAlloy, ;Aluminite

    ;OptimizationofProcessingofSemisolidSlurryMaking

    ;BasedonArtificialNeuralNetworkZhanqSonqYanq, ;GengMaopeng,XieShuisheng.,GuoXiaoqin, ;ChengJunwei.LiQian,LiSizhong,ShaoYan

    ;tao,ZhangYIna(1.DepartmentofMechanica1and ;Electron,ZhengzhouInstituteofAeronautica1Indus

    ;tryManagement,Zhengzhou,China;2.Mechanica1 ;andElectrica1Schoo1.NanchangUniversity.Nan

    ;chang,China;3.BeijingGeneralResearchInstituteof ;NonferrousMeta1,Beiiing,China)2008,28(7)505

    ;507

    ;AbstractEffectsofprocessingparametersonmicro

    ;structureofsemisolidslurrypreparedbymechanica1 ;stirringwereinvestigated.Theoptimizedmode1of ;processingparametersinmechanicalstirringwases

    ;tablishedbymeansofartificia1neura1networkin ;whichthesolidfractionandsolidphasesizeofthe ;semi-solidstructurearetakenasinputparametersand ;stirringvelocity,stirringtime,holdingtimeandpou

    ;rlngtemperatureasoutputparametersbasedonor

    ;thogonaltestingtopreparedesirablesemisolidslurry.

    ;Theoptimizedresultsarewel1inagreementwithex

    ;perimenta1ones.Therefore,theartificia1neuralnet

    ;workmode1canbeusedtooptimizetheprocessingof

;theslurringmakingduringthesemisolidforming.In

    ;addition.themode1canbeusedfordifferentslurry

    ;makingwithalteringmputparameters.

    ;KeyWords:ArtificialNeuralNetwork.SemisolidMi

    ;crostructure,SemisolidSlurryMaking,Optimization ;ExperimentandNumericalSimulationofCrankthrow ;ShapePartinSequentialSolidificationCaoWenjiong, ;ZhouZhaoyao,LuoZongqiang,LiYuanyuan

    ;(Schoo1ofMechanica1Engineering.SouthChinaUni

    ;versityofTechnology,Guangzhou,China)2008.28 ;(7)507509

    ;AbstractEffectsofsimultaneousso1idificationandse

    ;quentia1solidificationonqualityofcrankthrowshape ;partswereanalyzed.Thefillingprocessofsequentia1 ;solidificationwassimulatedandcomparedwiththat ;fromexperimenta1results.Theresultsshowthatthe ;hotspotincrankthrowshapepartsiseffectivelyelimi

    ;natedandtheshrinkageporosity(hole)inthepartsis ;decreasedbycontrollingthesequenceofsolidification. ;KeyWords:CrankthrowShapeParts,SequentialSolidi- ;fication.NumericalSimulation

    ;OptimizedDesignofGatingSystemforDie-castingMag

    ;nesiumAlloySeatFrameworkBasedonVisualization ;DisplayHanJieIi,LongSiyuna,CaoHanxue,Cai ;Jun,ZengWenfeng,MaoRongjie,ChenLiya(1. ;Schoo1ofMechanica1Engineering,ChongqingUniver

    ;sity,Chongqing,China;2.ChanganAutomobile ;(Group)Co.,Ltd.,ChongqingVniversity,

    ;Chongqing,China)2008,28(7)510~512

    ;AbstractThefillingandsolidifyingprocessesofdie ;castingmagnesiumalloyseatframeworkwerevisual

    ;izedbyafiniteelementmethodtopredictthepotential ;defectpositionintheseatframework.Basedonsimu

    ;1atedresults.thedesignofgatingsystemwasopti

    ;mized.Theresultsshowthattheentrappedgasand

    ;shrinkageporosity(hole)canbeobviouslydecreased ;inmagnesiumalloyseatframeworkduringdiecasting ;withoptimizedgatingsystem,greatlyimprovingthe ;qualityofdiecastingseatframework.Furthermore, ;theshortcomingsofconventionaldiecastingprocess ;anddiedesigncanbeeffectivelyrelievedandtheprod

    ;uctperiodcanbeshortenedgreatly.

    ;KeyWords:Visualization,MagnesiumAlloy,DieCast

    ;ing,ProcessingDesign

;SimulationofEffectsofPhase-fieldParametersonDen

    ;driticGrowthinaForcedFlowChenYuiuan,Chen ;Changle,QiuWenxu,JiangShuang(TheLaborato

    ;rvofCondensedMatterStructureandProperties. ;Schoo1ofScience.NorthwesternPolytechnica1Uni

    ;versity,Xian,China)2008,28(7)513515

    ;AbstractThephasefieldmode1basedontheTongand

    ;Bechemannmode1whichcouplestheflowfieldwasde

    ;velopedtosimulatetheeffectsofphase.fieldparame.

    ;tersondendritegrowthinmicrostructureofpuremet

    ;a1bythefinitedifferencemethod(FDM).Theresults ;showthatthedendriticmorphologyobviouslychanges ;undertheconditionofconvection,inwhichthebranch ;ofupperdendriteisthelongestandthatofdownden

    ;driteistheshortestandthe1engthofthebranchin ;horizonta1directionismiddle.Thehighertheunder

    ;coolingrateis.themoredevelopmentthesidebran

     ;chesinupperandinhorizonta1directionare:the1ar

    ;gertheamsotropyparameters1s,thethinnerthe ;branchofmaindendritesis,andthesmallerthesec

    ;onddendritespacingis.Inaddition,thedendritetip ;velocityisacceleratedwiththeincreaseofconvection ;velocity.

    ;KeyWords:ForcedConvection,ThermalNoise,Side- ;branching,Phase-fieldParameters

    ;ResearchProgressinCastingTechnologiesforMultic- ;rystallineSiliconinSolarCellsGuoJinqiie,Huang ;Feng,ChenRuirun,DingHongsheng,BiWeisheng, ;FuHengzhi(InstituteofSolidificationProcessingof ;AdvancedMaterials,Schoo1ofMaterialsScienceand ;Engineering,HarbinInstituteofTechnology,Har

    ;bin,China)2008,28(7)516521

    ;AbstractDuetoitshighratioofperformancetoprice, ;mu1ticrvstallinesiliconbecomesthemainphotovohaic ;materials.With1owcostofthesolarcells.itissignif

    ;icanttoresearchanddevelopcastingtechnologyfor ;?

    ;

    ;multicrystaUinesiliconinsolarcells.Origination, ;principle,advantagesanddisadvantagesofthecasting ;technologiesweredescribedforproducingmulticrys

    ;talinesiliconingot,ribbonsiliconandfilmsilicon,and ;theSistructurecharacteristicsofthesiliconprepared ;bydifferentwayswereexpounded.Newcastingtech