稀土Pr、Sm、Y对Al-Cu合金组织的影响  

Effects of Rare Earth Pr,Sm and Y on Microstructure of Al-Cu Alloy

作　　者：岳春雨[1] 黄宏军[1] 左晓姣[1] 王宇翔 陶承闯 苏明[1] 袁晓光[1] Yue Chunyu;Huang Hongjun;Zuo Xiaojiao;Wang Yuxiang;Tao Chengchuang;Su Ming;Yuan Xiaoguang(School of Materials Science and Engineering,Shenyang University of Technology)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110000

出　　处：《特种铸造及有色合金》2022年第6期712-716,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51875365)

摘　　要：选取Al-4.4Cu-1.5Mg-0.15Zr合金,分别添加(质量分数)0.1%的Pr、0.1%的Sm、0.1%的Y,利用SEM、EDS、XRD等分析方法研究稀土元素对合金的作用机理。结果表明,分别添加0.1%的Sm、Pr、Y后,与基体合金相比,合金组织得到不同程度的细化,二次枝晶间距减小,合金中孔洞等缺陷减少;稀土元素分别在晶界处,形成Al_(3)Pr、Al_(10)Cu_(7)Sm_(2)、Al_(6)Cu_(6)Y相;添加0.1%的Pr,合金组织细化效果最佳,二次枝晶的间距最小,稀土化合物在晶界处分布最均匀。Al-4.4Cu-1.5Mg-0.15Zr alloy was selected and added with 0.1% Pr, 0.1% Sm and 0.1% Y, respectively. The working mechanism of rare earth elements on the alloy was investigated by SEM, EDS and XRD. The results indicate that the microstructure of alloys with 0.1% Sm, Pr and Y are refined in different degrees compared with that of the matrix alloy, where the secondary dendrite spacing is decreased, and the defects such as holes in the alloy are reduced. The Al_(3)Pr, Al_(10)Cu_(7)Sm_(2) and Al_(6)Cu_(6)Y phases are formed at grain boundaries, respectively. The alloy with 0.1% Pr addition has desirable refinement effect, where the secondary dendrite spacing is the least, and the rare earth compounds are most evenly distributed at grain boundaries.

关 键 词：AL-CU合金 稀土元素 组织形貌 细化作用 

分 类 号：TG146.21[一般工业技术—材料科学与工程]