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1、J.Cent.SouthUniv.Technol.(2007)03?0305?05DOI:10.1007/s11771?007?0060?xEffectsofcryogenictreatmentonmechanicalpropertiesofextrudedMg-Gd-Y-Zr(Mn)alloys1,211XIONGChuang-xian(熊創(chuàng)賢),ZHANGXin-ming(張新明),DENGYun-lai(鄧運(yùn)來),111XIAOYang(肖陽(yáng)),DENGZhen-zhen(鄧楨楨),CHENBu-xiang(陳部湘)（1.SchoolofMaterialsScie
2、nceandEngineering,CentralSouthUniversity,Changsha410083,China;2.DepartmentsofCivilEngineering,HunanCityCollege,Yiyang413000,China）Abstract:TheinfluenceofcryogenictreatmentonthemechanicalpropertiesoftheextrudedMg-Gd-Y-Zr(Mn)alloyswasinvestigatedbythetensiletests,scanningelectronmicroscopy
3、(SEM),transmissionelectronmicroscopy(TEM),andenergydispersiveX-rayspectroscopy(EDS).Theresultsshowthatthemechanicalpropertiesofbothalloysareimprovedgreatlyduringtheinsitutensiletestbysoakingthesamplesinliquidnitrogenfor10min.Theultimatetensilestrength,yieldtensilestrengthandelongationofc
4、ryogenictreatedmagnesiumalloyaddedwithzirconiumormanganesearelargelyelevated.Andremarkablemicrostructurechangeisobservedinbothalloysbycryogenictreatment.Therearealargenumberoftwins，rod-like,tree-likeandchrysanthemum-likeprecipitatedphasesinthemicrostructuresandthefracturesurfacesexhibitt
5、hecharacteristicsofductilerupturewhentheyareobservedatroomtemperature.Keywords:magnesiumalloy;cryogenictreatment;mechanicalproperty;microstructure1Introduction2ExperimentalDuetohighspecificstrength,specificstiffness,Twoas-castalloyswerepreparedfrom99.95%Mgdampingandelectromagnetismshield
6、properties,(massfraction),99.96%Gd(massfraction),and99.94%magnesiumalloysarewidelyusedasstructuralmaterialsY(massfraction)bymeltinginaresistancefurnace.inthefieldofautomobile,aerialandspacingengineering.BothrareearthmetalsandZrwereaddedintomeltsinRecentliteraturesshowthatitispossibletoim
7、provethetheformofMg-Gd,Mg-YandMg-ZrmasteralloysstrengthofMgalloyssubstantiallybyadditionofheavypreparedbefore.MnwasaddedintheformofMnCl2.[1?4]rareearthelements,andtheadditionofGdandYThenominalcompositions(massfraction)oftwoalloysmightimprovepropertiesofMgalloy,especiallyh
