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《Grain refinement of Mg–Al based alloys by a new Al–C master alloy》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JournalofAlloysandCompounds467(2009)202207GrainrefinementofMgAlbasedalloysbyanewAlCmasteralloyHanGuang,LiuXiangfa∗,DingHaiminKeyLaboratoryofMaterialsLiquidStructureandHeredity,MinistryofEducation,ShandongUniversity,Jinan250061,ChinaReceived21October2007;accepted6December2
2、007Availableonline15December2007AbstractAnewAlCmasteralloyforgrainrefinementonMgAlbasedalloyshasbeenfabricatedbypowdermetallurgy.Al4C3isformedbyreactionbetweenpartoff.c.cAl(C)solidsolutionandaluminumduringfabrication,andthenet-likemixtureofAl4C3andAl(C)solidsolutionisloca
3、tedattheboundariesofaluminumparticles.Millingandpressingofgraphiteandaluminumpowderschangethenatureofgraphiteandensurethekineticsconditionsofthereactionbetweenthetwophases.GrainrefinementexperimentshowsAl1CmasteralloycanefficientlyrefineAZ31(Mg3%Al1%Zn).At760◦C,whenadding2w
4、t.%Al1Cmasteralloy,thegrainsizeisreducedsharplyfrom400mto140mcomparingtothesampleadded2wt.%commercialpurealuminum,andthegrainmorphologyof-Mgtransitsfromacharacteristicsixfoldsymmetricalshapetoapetal-likeshape.©2007ElsevierB.V.Allrightsreserved.Keywords:Metalsandalloys
5、;Powdermetallurgy;Microstructure;Metallography;X-raydiffraction1.Introductioncialgrainrefinershouldbedeveloped.Amongtheaddedagentsofgrainrefining,addingmasteralloyisanimportantresearchMagnesiumalloys,aslightweightstructuralmaterials,aredirectionforitsconvenientoperation,le
6、sspollutionandfinereceivingincreasedattentiononreplacingothermetalsinauto-grainrefinementefficiency.mobileindustry.GrainrefinementisanimportantmethodtoThemechanismofcarboninoculationrefiningmethodtoimprovethemechanicalpropertiesandworkabilityofbothcastMgAlbasedalloysisveryimp
7、ortanttotheresearchanddesignandwroughtmagnesiumalloys[16].ofmasteralloy.AmongthehypothesesproposingtoexplaintheMgAlbasedalloysarethemostcommoncommercialmag-mechanism,Al4C3nucleihypothesis[915]hasbeenthemostnesiumalloystowhichmanygrainrefiningmethodshavebeencommonlyaccepte
8、dtheory,asgrainrefinementbyanadditionapplied,suchassuper-heating,Elfinal,carboninoculationandofcarbonison
