稀土Nd（Y）對Mg-Zn系合金組織及力學性能的影響.pdf

1、沈陽工業(yè)大學碩士學位論文稀土Nd（Y）對MgZn系合金組織及力學性能的影響姓名：任偉才申請學位級別：碩士專業(yè)：材料學指導(dǎo)教師：楊林孫晶20070305稀十Ndfv)對MgZn系合金組織及力學性能的影響TheEffectofNd(Y)OnMicrostructureandMechanicalPropertiesofMgZnAlloysAbstractWroughtmagnesiumisnotedtohaveahigherstrengtha

2、ndductilitythancastmagnesiumTesearchthegoodpropertiesformagnesiumalloyscontainedRE，inthepresentresearchNdandYrespectivelyisoddedtotheMg一5wt％Znbasealloystoproduceascastandas—extruded(hotextrudedextrudedratiois175：alloyswi

3、thdifferentcompositionThispaperinvestigatestheeffectofREelementsandprocessingmethodsonmicrostructureandmechanicalpropertiesanddiscussesthestrengtheningmechanismTheresultsshowthatNdadditionoilMg一5wt％Znmagnesiumalloyrefine

4、thegrain；especially，whencontentofNdis3wt％thegrainsarethemostfinestWhenMg一5wt％Zn(1～5)wt％Ndalloyisextrudedat330i10。C，thegrainrefinedobviouslyComparingtoas—castalloyofthesamecomposition，thesizeofgrainsofhotextrudedalloyisfi

5、ner，withtheincreaseofpercentageofNd，andthelongitudinallinearofmicrostructureismoreobviousMoreover，whenhot—extrudedMg一5wt％Znmagnesiumalloy，contentofNdis3wt％，theultimatetensilestrengthis3301MPa；andyieldstrengthis2948MPa；th

6、eelongationis984％atroomtemperatureTheultimatetensilestrengthis2484MPa；andyieldstrengthis2034MPa；theelongationis3416％at150。CTheultimatetensilestrengthis2194MPa；andyieldstrengthis1915MPa；theelongationis426％at200。CTheresear

7、chonthemicrostructureandtensilepropertiesofasextrudedMg5wt％Zn一(1～5)wt％NdalloysrevealsthealloysarenotsensitivetoagingtreatmentandthemicrostructurcandthetensilepropertieshavenoobviouslychangeSotheheattreatmentisnotnecessar

8、yforthisseriesofmagnesiumalloyInaddition，theeffectofNdandYontheMg5wt％ZnalloyisalmostthesameDiscussionshowsthatREadditionandextrudedtreatmenthavehugeeffectsontensilepropertiesofMg一5wt％ZnalloyTheycanrefinegrainandpurifythe