稀土Er对Al-Cu-Mg-Ag合金微观组织和力学性能的影响  

Effect of Er Addition on Microstructure and Mechanical Properties of Al-Cu-Mg-Ag Alloys

作　　者：谢浩宇 刘志义[1] 赵娟刚 曹靖 宁国栋[2] 袁豪杰 XIE Hao-yu;LIU Zhi-yi;ZHAO Juan-gang;CAO Jing;NING Guo-dong;YUAN Hao-jie(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Beijing Research Institute of Mechanical&Electrical Technology,Beijing 100083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]北京机电工程研究所,北京100083

出　　处：《矿冶工程》2022年第1期140-143,148,共5页Mining and Metallurgical Engineering

基　　金：国家重点研究与发展计划项目(2016YFB0300900)。

摘　　要：通过室温拉伸和高温拉伸实验以及金相显微镜、扫描电镜、透射电镜和X射线衍射测试,研究了稀土Er对Al-Cu-Mg-Ag合金微观组织和力学性能的影响。结果表明:Al-Cu-Mg-Ag合金中添加微量Er元素后,合金晶粒尺寸明显减小;Er在Al-Cu-Mg-Ag合金中以Al_(8)Cu_(4)Er相存在,没有观察到Al_(3)Er相;随着Er含量升高,Al-Cu-Mg-Ag合金中Ω相析出受到抑制,进而导致合金的室温和高温力学性能显著下降。The effect of an addition of rare-earth Er on the microstructure and mechanical properties of Al-Cu-Mg-Ag alloys was investigated by tensile tests at room temperature and high temperature,as well as using metallographic microscope,scanning electron microscopy,transmission electron microscopy characterization and X-ray diffraction analysis.The results reveal that a small addition of Er can reduce the grain size of Al-Cu-Mg-Ag alloy;Er in Al-Cu-Mg-Ag alloy exists in the form of Al_(8)Cu_(4)Er phase,and no Al_(3)Er phase is observed;the precipitation ofΩphase is obviously suppressed with the increasing of the Er content,thereby leading to degradation of the mechanical properties of Al-Cu-Mg-Ag alloy at room temperature and high temperature.

关 键 词：铝合金 AL-CU-MG-AG 力学性能 微合金化 稀土 ER Ω相 

分 类 号：TB302[一般工业技术—材料科学与工程]