含稀土铒元素Al-Zn-Mg-Cu合金微观组织及力学性能的研究  

Research on Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Containing Rare Earth Erbium

作　　者：韩逸[1,2] 邓桢桢[1] 李炼[1] 乐永康[1] 张新明[2] 

机构地区：[1]苏州有色金属研究院有限公司材料工艺研究所,江苏苏州215026 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《铸造》2010年第6期603-606,共4页Foundry

基　　金：中国铝业股份有限公司科研计划项目(ZB2006CBQB15-B19)

摘　　要：采用金相观察、扫描电镜与能谱分析、显微硬度和力学性能测试等方法,研究了不同含量稀土元素Er对Al-Zn-Mg-Cu合金组织与性能的影响。结果表明,在Al-Zn-Mg-Cu合金中添加Er元素后二次枝晶臂间距减小,枝晶网胞变薄。Er元素主要以Al8Cu4Er相形式存在于晶界,少量固溶于铝基体中。此外,Er元素能有效抑制Al-Zn-Mg-Cu合金发生再结晶,细化再结晶晶粒,提高合金时效强化效果。当Er含量超过0.3%时,脆性Al8Cu4Er相数量增多,导致合金力学性能变差。Effects of different Er content on the structure and properties of AI-Zn-Mg-Cu alloy were studied with optical microscope, scanning electron microscope, microhardness test and tensile properties measurement. Results show that the secondary dendritic arm spacing decreased and dendritic areas became thinner after addition of rare earth Er. In AI-Zn-Mg-Cu alloy, the Er mainly exists at the grain boundary as Al8Cu4Er phase, and a small quantity of it as solid solution in α -Al. Moreover, Er can restrain the recrystallization behaviour of Al-Zn-Mg-Cu alloy, refine recrystallization grain and improve the effects of ageing strengthening. When the content of Er was up to 0.3%, the strength and ductibility was obviously reduced as the result of the formation of eutectic Al8Cu4Er compound.

关 键 词：稀土Er Al-Zn-Mg—Cu合金 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]