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1、Tensilefractureofas-castandhotrolledMg-Zn-Yalloywithlong-periodstackingphase1,213WANGBai-shu(王柏树),XIONGShou-mei(熊守美),LIUYong-bing(刘勇兵)1.StateKeyLaboratoryofAutomotiveSafetyandEnergy,DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China;2.KeyL
2、aboratoryofAdvancedStructuralMaterials,MinistryofEducation,DepartmentofMaterialsScienceandEngineering,ChangchunUniversityofTechnology,Changchun130012,China;3.KeyLaboratoryofAutomobileMaterials,MinistryofEducation,DepartmentofMaterialsScienceandEngineering,Jilin
3、University,Changchun130025,ChinaReceived23September2009;accepted30January2010Abstract:AnexperimentalMg97Zn1Y2(molarfraction,%)alloywasproducedbyrollingtheas-castalloy.Themicrostructureofthealloyiscomposedoftheα-Mg(alsomarkedas2H-Mgwithreferencetolong-periodstac
4、kingstructureaccordingtohexagonalclosepackedstructure)andlong-periodstacking(LPS)phase.TensiletestsofMg97Zn1Y2alloyincomparisonwithpureMgwereconducted.Thefracturemorphologiesofthetensilespecimenswerecharacterizedandthemicrostructuresnearfracturesurfacewereobser
5、ved.TheresultsshowthattherolledMg97Zn1Y2alloyshowsamixedfracturemodeincludingdimplesindicatingaductilefracturepatternandasmallfractionofcleavageplanesindicatingabrittlefracturepattern,whichisdifferentfromthesinglebrittlefractureoftheas-castalloy.Inaddition,thep
6、lasticdeformationismainlyfromdislocationsinducedstrainwithsmallstrengtheningeffectduringplasticdeformationintheas-castMg97Zn1Y2alloy,andthestrainhardeningrateissimilartothatoftheas-castpuremagnesium.ThedeformationmechanismofMg97Zn1Y2alloyisdifferentfromthatofth
7、epuremagnesiumaccordingtoametallographicalobservationthatwhethertwinsarefoundornot.ThestrengtheningeffecthardlyexistsintherolledMg97Zn1Y2alloyunderthesamedislocationsinducedstrain,whichisdifferentfromthatoftheas-castalloywithmoderatestrengtheningeffect.Keywords
8、:magnesium-yttrium-zincalloy;long-periodstackingphase,rolling;mechanicalproperties;fracturestacking(LPS)structurebyelectrondiffractiontechnique.1IntroductionKAWAMURAetal[6−8
