资源描述：
《Effect of Nd and Y on the microstructure and mechanical》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、MaterialsScienceandEngineeringA445446(2007)16EffectofNdandYonthemicrostructureandmechanicalpropertiesofZK60alloyH.T.Zhoua,∗,Z.D.Zhanga,C.M.Liua,Q.W.WangbaSchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,PRChinabSchoolofMaterialsScienceandEngineering,S
2、hanghaiJiaoTongUniversity,Shanghai200030,PRChinaReceived26July2005;receivedinrevisedform29March2006;accepted12April2006AbstractTheeffectofneodium(Nd)andyttrium(Y)onthemicrostructureandtensilepropertiesofZK60alloyareinvestigated.Experimentalresultsshowthatanadditionofneodiumandyt
3、triumbothbringsaboutprecipitationofanewMg41Nd5andMg3Zn6Y(I)phasesandrefinetheas-castgrains.Afterhotextrusion,thealloyaddedwithNdandthealloywithNdandYaregreatlyrefinedthroughdynamicrecrystallizationbymeansofthepiningeffectofparticlesorprecipitates.Asaresult,veryfinergrainswithsizeof
4、48mareobtainedinthealloywithNdandY.However,thegrainsizeofthealloywithNdisrelativelylarge.ThissuggestedthatthecombinationofNdandYadditionhasagreateffectongrainrefiningduringdynamicrecrystallization,andleadstoeithertheincreaseofboththemeltingtemperaturesoftheeutecticphasesandtheme
5、ltingtemperatureofthealloysortheincreaseoftheyieldstrengthandtensilestrengthofthealloywithNdandYatroomtemperature.Incontrast,theelongationofbothZK60andthealloywithNdarehigherthanthatofthealloywithNdandY.©2006PublishedbyElsevierB.V.Keywords:ZK60alloy;Neodium;Yttrium;Extrusion;Ten
6、sileproperties1.Introductionstillislowcomparedtoaluminumalloy.Fromthispointofview,manyresearchersdevotetheireffortstoimproveitsmechanicalMgalloysarethelighteststructuralalloy,andhencetheyproperties.Recently,itisreportedthatextrudedMgalloyscon-arelikelytobeapplicabletomanystructu
7、ralpartsinauto-tainingREexhibitexcellentmechanicalproperties[6,7].Formotiveandaeroindustriesduetohighspecificstrength,highinstance,Maetal.studiedonextrudedZK60-REalloysandspecificstiffnessandgooddampingcapacity[1,2].However,suggestedthathotextrusioncouldimprovetensilepropertiesofs
8、trengthofmostcurrentMgalloyscannotmeetthestreng
