航空学报 > 2004, Vol. 25 Issue (2): 197-200

少量Cu对喷射沉积Al-Li合金显微组织与性能的影响

戴圣龙1, 韩雅芳1, 杨守杰1, 李树索2   

  1. 1. 北京航空材料研究院, 北京 100095;2. 北京航空航天大学材料科学与工程学院, 北京 100083
  • 收稿日期:2003-02-21 修回日期:2003-06-12 出版日期:2004-04-25 发布日期:2004-04-25

Effect of Small Content Cu on Microstructure and Properties of Spray Deposited Al-Li Alloy

DAI Sheng-long1, HAN Ya-fang1, YANG Shou-jie1, LI Shu-suo2   

  1. 1. Institute of Aeronautical Materials, Beijing 100095, China;2. Materials Science and Engineering School, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2003-02-21 Revised:2003-06-12 Online:2004-04-25 Published:2004-04-25

摘要: 用喷射沉积方法制备了Al-Li合金及其含0.5%Cu的改型合金,进行了挤压和时效处理,测定了不同状态下这两种合金的显微组织和室温拉伸性能。结果表明,喷射沉积状态的Al-3.8Li-1.0Mg-0.4Ge-0.2Zr合金具有等轴细晶组织,析出Al4Li9和δ AlLi相,时效后析出大量δ' AlLi相;添加0.5%Cu使屈服强度提高30~48MPa,拉伸强度提高44MPa,性能提高的原因是Cu的固溶强化和Li在基体固溶度减少导致δ'相含量增加。

关键词: 喷射沉积, Al-Li合金, 时效, 拉伸性能

Abstract: Al-Li alloy containing high content of Li and its modified alloy with 0.5% Cu are prepared by spray deposited processing,and then extruded and aged. Microstructure and tensile properties at room temperature are determined for the two alloys at different conditions. The results show that spray deposited Al-3.8Li-1.0Mg-0.4Ge-0.2Zr alloy possess a fine equiaxed microstructure and precipitates Al4Li9 and δ-AlLi phases. Large amounts of δ'-AlLi phases are formed after aging. The addition of 0.5%Cu to the alloy leads to an improvement of 30~48MPa and 44MPa for yield strength and ultimate tensile strength respectively. The reason of improvement is due to the solid-solution strengthening effect of Cu and the decrease of the solid solubility of Li in the matrix leading to the higher volume fraction of δ'phases.

Key words: spray deposition, Al-Li alloy, aging, tensile property