稀土Nd（Y）對(duì)Mg-Zn系合金組織及力學(xué)性能的影響.pdf

1、沈陽(yáng)工業(yè)大學(xué)碩士學(xué)位論文稀土Nd（Y）對(duì)MgZn系合金組織及力學(xué)性能的影響姓名：任偉才申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：材料學(xué)指導(dǎo)教師：楊林孫晶20070305稀十Ndfv)對(duì)MgZn系合金組織及力學(xué)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