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【图文】Characterization of planar features in Mg–Y–Zn alloys
Available online at
ActaMaterialia58(2010)
图片(Characterization of planar features in Mg–Y–Zn alloys)
图片(Characterization of planar features in Mg–Y–Zn alloys)
/locate/actamat
CharacterizationofplanarfeaturesinMg–Y–Znalloys
Y.M.Zhua,A.J.Mortonb,M.Weylandc,J.F.Niea,*
ARCCentreofExcellenceforDesigninLightMetals,DepartmentofMaterialsEngineering,MonashUniversity,Vic.3800,Australia
CSIROMaterialsScienceandEngineering,Clayton3168,Australia
MonashCentreforElectronMicroscopy,MonashUniversity,Vic.3800,Australia
Received24June2009;receivedinrevisedform7August2009;accepted10September2009
Availableonline14October2009
TheplanarfeaturesinaMg–8Y–2Zn–0.6Zr(wt.%)alloysolution-treatedat500°Cfor1hhavebeenexaminedusingconventionaltransmissionelectronmicroscopyandatomic-resolutionhigh-angleannulardark-fieldscanningtransmissionelectronmicroscopy.Threetypesofplanarfeaturesaredetectedinthemicrostructure.Thefirsttype,whichwaspreviouslyreportedtobeanintrinsicstackingfaultI1boundedbyaFrankpartialdislocation,isshowntobethe14HprecipitatephasethatisassociatedwithShockleypartialdislocations.ThesecondtypeisalsoaprecipitatephasethathasasingleunitcellheightandisassociatedwithShockleypartialdislocations.Thethirdtypeofplanarfeaturecomprisessmallribbon-likestackingfaults.ThesestackingfaultsaredeterminedasintrinsicI2typeboundedbytwoShockleypartialdislocations,whichisfurtherconfirmedbycomputersimulation.Thestackingfaultenergyassociatedwiththefaultsismuchsmallerthanthatofpuremagnesium.
?2009PublishedbyElsevierLtd.onbehalfofActaMaterialiaInc.
Keywords:MPSDHAADF-STEM
1.Introduction
Magnesiumalloyscontainingrare-earth(RE)elementshavereceivedconsiderableattentionduringthepasttwodecadesduetotheirpotentialinachievinghighstrengthandexcellentcreepresistance.Mostofrare-earthcontain-ingmagnesiumalloysareprecipitation-hardenable,suchasMg–Y–Nd[1–3],Mg–Gd[4–6],Mg–Gd–Nd/Y[7,8],andthealloysbasedonthem[9–17].Themicrostructuralevolu-tionsinthesealloyshavebeenrelativelywellestablished.Incomparison,ternaryMg–Y–Znalloysexhibitlittleage-hardeningresponse[18],eventhoughanultrahighstrengthof600MPahasbeenachievedinthesealloyswhentheyareproducedbyrapidsolidificationprocesses[19].TheuniquemicrostructuresoftheMg–Y–Znalloyshaveattractedmuchattentioninrecentyears.Themicrostructureschar-acteristicoftheMg–Y–Znalloysusuallyincludearangeofphaseswithlong-periodstackingorderedstructures,
Correspondingauthor.Tel.:+;fax:+.E-mailaddress:nie@eng.monash.edu.au(J.F.Nie).
amongwhich14Hand18Raremostcommonlyobserved[20–27].Ourrecentwork[28]hassuggestedthatthe14Hand18RstructuresareactuallymadeupoftwoandthreebuildingblockshavinganABCA-typestackingsequence,respectively.However,thedetailedcrystalstructuresofthesetwophasesandtherelationshipbetweenthemremaintobeestablished.Apartfromtheselong-periodstackingorderedstructures,someplanardefectshavealsobeenreportedinpreviousinvestigationsoftheMg–Y–Znalloys[26,29–31].Buttheidentityoftheseplanardefectsandtheirrelationshipwiththelong-periodstackingorderedstruc-tureshavenotbeenstudiedsystematically.
Therearethreetypesofstackingfaultsinpuremagne-siumanditsalloys[32–34].TwoareintrinsicfaultsI1andI2whichformasfollows:
???ABABBABA???(removalofI1:??ABABABABA???
1?A)???ABABCBCB??slideofAE2:h1100i1andI?
100i.??ABABABAB?????ABABCACA??slideofAEh1?
Thethirdoneisanextrinsicfault,E,whichcanbeformedbyinsertinganextraplaneofC,i.e.E:??ABABA-BAB?????ABABCABA??.Ofthesethreetypesofstacking
/$36.00?2009PublishedbyElsevierLtd.onbehalfofActaMaterialiaInc.doi:10.1016/j.actamat.
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