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ID:37803770
大小:1.02 MB
页数:9页
时间:2019-05-31
《Mg-Zn-Ca系富Mg侧三元化合物及其300℃固态相平衡》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、登槊万方数据Availableonlineatwww.sciencedirect.com.。,,·::,ScienceDirectPressTrans.NonferrousMet.Soc.China21(2011)2147—2153TransacfionsofNonferrousMetalsSocietyofChinawww.tnmsc.cnTernarycompoundsandsolid-statephaseequilibriainMg—richsideofMg—Zn—Casystemat300oCLIHong·xiao,RENYu-ping
2、,MAQian-qian,JIANGMin,QrNGao-wuKeyLaboratoryforAnisotropyandTextureofMaterials,MinistryofEducation,NortheasternUniversity,Shenyang110819,ChinaReceived30October2010;accepted27May2011Abstract:ThephaseequilibriaandcompositionsinMg-richsideat300oCwereinvestigatedinMg-Zn—Caternar
3、ysystemthroughtheequilibratedalloymethodbyusingscanningelcottonmicroscopy,electronprobemicroanalysis,X-raydiffractionandtransmissionelectronmicroscopy.TheresuItsshowthattwoternarycompoundsTlandT2canbeinequilibriumwitlltheMg.basedsolidsolutioninMg—Zn-Casystem.五phaseisalinearc
4、ompoundwiththecompositionregion(molarfraction)ofl5%Ca,20.5%-48.9%ZnandbalancedMgat300oC.ItshexagonalstructureparametersdecreasewithincreasingZncontent.i.e.a=0.992-0.94511111.c=1.034-1.003nfn.T2phasehashexagonalstructurewiththecompositionregionof26.4%-28.4%Mg。63.2%-65.5%Znand
5、7.1%-8.4%Ca.At300。C.thesolubilityofZnintheMg.basedsolidsolutionincreasesfortheadditionofCa,themaximumsolubilityofZnis3.7%.Three-phasefieldsconsistingofa-Mg+M92Ca+乃,a-Mg+Tl+疋,a-Mg+1"2+MgZnandMgZn+T2+M勘Zn3existintheMg-Zn-Casystemat300。C.Keywords:Mg.—Zn..Casystem;ternarycompoun
6、d;structure;composition;phaseequilibrium1IntroductionAlloyingisthemosteffectivemethodtomodifythemicrostructuresandpropertiesofthestructuralMg.basedalloys.Znadditiontothemagnesiumalloycouldresultintheage—hardeningr1-3].AdditionofCawithlowdensityandcostcouldincreasetheignition
7、temperatureofthemoltenmagnesiumalloyduetotheformationofthestableoxidizationlayer[4—51.Specially,theternaryadditionofCatotheMg—Znalloysismoreeffectivefortheimprovementofthemechanicalproperties[6—101.Asearlyasinthe1930s,researchontheMg—Zn--Casystembegan.Buttillthe1960s,thepart
8、ialisothermalsectionoftheMg-Zn--Casystemat335。CwasobtainedbyCLAItK『11】.Duet
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