稀土Er对过共晶Al-40Cu合金铸态组织的影响  

Effect of Rare Earth Er on As-cast Microstructure of Hypereutectic Al-40Cu Alloy

作　　者：童文辉 李为轩 王杰 赵晨爔 王丹妮 李壮 TONG Wenhui;LI Weixuan;WANG Jie;ZHAO Chenxi;WANG Danni;LI Zhuang(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136

出　　处：《热加工工艺》2023年第1期25-27,37,共4页Hot Working Technology

摘　　要：制备了添加不同含量稀土元素Er的Al-40Cu合金样品,采用OM、SEM、EDS、XRD、DSC研究Er元素对过共晶Al-40Cu合金铸态组织的影响。结果表明,通过在Al-40Cu合金中添加Er能有效细化初生Al_(2)Cu相。在Al-40Cu合金中加入0.7wt%的Er元素,初生Al_(2)Cu相的体积分数显著减少,形貌由粗大的针片状细化为不规则粒状。但在Al-40Cu合金中加入1.5%的Er元素时,与不添加Er元素的Al-40Cu相比,初生Al_(2)Cu相尺寸未产生明显变化,形貌由针片状转变为块状,同时生成大量的Al_(8)Cu_(4)Er相。该相的析出温度约730℃,在初生相Al_(2)Cu析出之前形成,并在后续凝固过程中发生包共晶转变,依托Al_(8)Cu_(4)Er相形成了更多共晶组织,使得共晶组织的体积分数增加。The samples of Al-40Cu alloys with the different contents of rare earth element Er were prepared.The influence of Er on as-cast microstructure of hypereutectic Al-40Cu alloy was investigated by OM,SEM,EDS,XRD,DSC.The results show that the Al_(2)Cu primary phase in the Al-40Cu alloy can be refined effectively by adding Er.When the addition of Er element is 0.7 wt% in Al-40Cu alloy,the volume fraction of Al_(2)Cu primary phase is obviously reduced,and the morphology is refined from thick needle flake to irregular granular.When 1.5%Er element is added to the Al-40Cu alloy,the Al_(2)Cu primary phase changes from needle sheet to block without obvious change in size,compared with that of Al-40Cu alloy.At the same time,a large amount of Al_(8)Cu_(4)Er phases are generated.The precipitation temperature of the phase is about 730℃,which is formed before precipitation of the primary phase Al_(2)Cu.The Al_(8)Cu_(4)Er phase participates,and the peritectic-eutectic transformation occurs during the following solidification process and more eutectic is formed based on Al_(8)Cu_(4)Er phase,which increases the volume fraction of the eutectic.

关 键 词：过共晶Al-Cu合金 稀土元素ER 显微组织 晶粒细化 

分 类 号：TG243[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]