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1、Vol.30No.2铸造技术Feb.2009FOUNDRYTECHNOLOGY#203#铈对AZ91D镁合金组织和力学性能的影响陈芙蓉,李仕慧,郭锋,常淑琴(内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051)摘要:利用光学显微镜、X射线衍射和扫描电镜等分析研究了含铈AZ91D镁合金(0.26%Ce、0.69%Ce、0.93%Ce)的显微组织及相组成,并对其室温力学性能进行了测试,同时与不含铈AZ91D镁合金的组织和力学性能进行了比较。结果表明,当加入0.69%Ce时,合金铸态组织得到明显细化,网状B相呈弥散
2、的粒状分布于晶界上,同时有大量的针状物Al4Ce相出现;而当加入0.93%Ce时,合金的铸态组织没有细化现象,反而较AZ91D-0.69%Ce的组织有粗化的趋势,且针状化合物长大成杆状。适量稀土Ce可以改善合金的力学性能,当Ce含量为0.69%时,合金的抗拉强度、屈服强度、伸长率及硬度分别比AZ91D镁合金提高15.8%、8.7%、140%及15.7%,其综合力学性能达到最佳。分析了Ce对合金的综合强化机理。关键词:AZ91D镁合金;铈;力学性能;强化机理中图分类号:TG146.2+2文献标识码:A文章编号:1000-
3、8365(2009)02-0203-04EffectofCeonMicrostructureandMechanicalPropertyofAZ91DMagnesiumAlloyCHENFu-rong,LISh-ihui,GUOFeng,CHANGShu-qin(SchoolofMaterialsScienceandEngineering,InnerMongoliaUniversityofTechnology,Huhhot010051,China)Abstract:Themicrostructureandphasecom
4、positionofAZ91DmagnesiumalloyswiththedifferentadditionsofCewerestudiedbyopticalmicroscope(OM),X-raydiffraction(XRD)andscanningelectronmicroscope(SEM),themechanicalpropertiesatroom-temperatureweretested,andthemicrostrucutreandmechanicalpropertieswerecomparedbetwe
5、enthealloyswithandwithouttheadditionofCe.Theresultsshowthattheas-castmicrostructureofAZ91Dmagnesiumalloywithadditionof0.69wt%Ceisrefinedobviously,reticularBphaseisdistributeddispersedlyongrainboundaryandalargenumberofacicularAl4Ceappear.However,theas-castmicrost
6、ructureofthealloyAZ91Dmagnesiumalloywithadditionof0.93wt%Ceisnorefined,buthasacoarseningtrendwhencombinedwiththatofAZ91Dmagnesiumalloyswiththeadditionof0.69wt%Ceandtheacicularcompoundbecomerodlikestructure.TheappropriateCeadditioncanimprovethemechanicalpropertie
7、sofAZ91Dmagnesiumalloy,thetensilestrength、yieldstrength、elongationandhardnessofthealloywiththeadditionof0.69wt%Ceareincreasedby15.8%,8.7%,140%and15.7%respectivelywhencomparedwiththoseofAZ91Dmagnesiumalloy,andthecombinedmechanicalpropertyisthebest.Inaddition,thes
8、trengtheningmechanismofAZ91DmagnesiumalloywiththeadditionofCeisdiscussedaswell.Keywords:AZ91Dmagnesiumalloy;Cerium;Mechanicalproperty;Strengtheningmechanism[4,5]镁合金是目
