(1. 中南大学 材料科学与工程学院，长沙 410083;
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083；
3. 中南大学 有色金属先进结构材料与制造协同创新中心，长沙 410083；
4. 轻质高强结构材料重点实验室，长沙 410083)
摘 要: 通过金相显微分析(OM)、扫描电镜观察(SEM)、透射电镜观察(TEM)、X射线衍射(XRD)、显微硬度测试、拉伸性能测试和断裂韧性测试，研究不同时效制度对2050铝锂合金组织及性能的影响。结果表明：2050铝锂合金的最佳时效制度为(145 ℃，80 h)。T8态合金峰时效的主要析出相为T1相和S相，其中主要强化相为尺寸细小弥散分布的T1相，合金强化效果较好。实验合金经时效处理后存在明显的各向异性，合金沿轧制方向的屈服强度和抗拉强度最高。随着时效温度升高，合金断裂韧性下降。
关键字: 2050铝锂合金；时效；T1相；各向异性
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China;
3. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;
4. Science and Technology on High Strength Structural Materials Laboratory, Changsha 410083, China）
Abstract:The effects of aging process on the microstructure and properties of 2050 Al-Cu-Li alloy were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, hardness tests, tensile properties tests and fracture toughness tests. The results show that the optimum aging treatment is determined as (145 ℃, 80 h). The main precipates of the alloy in T8 temper are T1 phase and S phase at peak aging. The number of S phase is very small and the main strengthenning phase is T1 phase and the strengthening effect is better. The anisotropy during aging treatment for 2050 Al-Li alloy shows that, the yield strength and tensile strength of rolling orientation are the highest. With the increase of temperature, the fracture toughness of alloy decreases.
Key words: 2050Al-Li alloy; aging; T1 phase; anisotropy
