Mg-Zn-Ca系富Mg侧三元化合物及其300℃固态相平衡

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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