稀土Er改性Al-Si-Mg-Cu合金的组织性能  

Microstructure and properties of Er modified Al-Si-Mg-Cu alloy

作　　者：刘怀冰 雷璇璇 赵旭 吕林虎 何奕宝 朱行行 杜晓东[1,2] LIU Huai-bing;LEI Xuan-xuan;ZHAO Xu;LüLin-hu;HE Yi-bao;ZHU Xing-hang;DU Xiao-dong(Department of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;Engineering Research Center of High Performance Copper Alloy Materials and Processing,Ministry of Education,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]高性能铜合金材料及成形加工教育部工程研究中心,安徽合肥230009

出　　处：《材料热处理学报》2020年第11期22-29,共8页Transactions of Materials and Heat Treatment

基　　金：合肥工业大学2019年省级大学生创新创业训练计划项目资助(S201910359031);安徽省重点研发计划项目(201904a05020084);长丰-合肥工业大学产业创新引导资金项目(JZ2019QTXM0281);安徽万安资助项目(W2019JSKF0210);中央高校基本科研业务费专项资金(PA2020GDGP0054)。

摘　　要：采用显微硬度计、光学显微镜、扫描电镜、透射电镜和万能试验机等研究了具有不同Er元素含量的Al-3Si-0.45Mg-0.45Cu合金经不同时效处理后的组织与性能。结果表明,添加Er元素后,铸态合金的晶粒细化、α-Al树枝晶向等轴晶转变和共晶硅形态优化。时效处理后,基体α-Al中析出了强化相Al3Er,阻碍位错的运动,铸态下细长的棒状共晶硅发生球化,合金性能得到提升。当Er元素添加量达到0.6 mass%时,时效8 h后的合金硬度与拉伸强度达到峰值,较不含Er元素的铸态合金分别提高了57 HV0.2和138 MPa。Microstructure and properties of Al-3 Si-0.45 Mg-0.45 Cu alloy with different Er contents after different aging treatments were studied by means of microhardness tester, optical microscope, scanning electron microscopy, transmission electron microscopy and universal testing machine. The results show that after the addition of Er element, the grain refinement, the transformation of α-Al dendritic to equiaxial crystal and the morphology optimization of eutectic silicon appear in the as-cast alloy. After aging treatments, the enhanced phase Al3Er is precipitated from the α-Al matrix, which hinders dislocation movement, and spheroidization of the long and thin rod-like eutectic silicon of the as-cast alloy occurs, which improves the properties of the alloy. When the addition of Er elements reaches 0.6 mass%, the hardness and tensile strength of the alloy after aging at 160 ℃ for 8 h reach the peak value, which is 57 HV0.2 and 138 MPa higher than that of the as-cast alloy without Er elements, respectively.

关 键 词：Al-3Si-0.45Mg-0.45Cu合金 Er元素 时效强化 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]