( 1. 中南大学 材料科学与工程学院， 长沙 410083；
2. 中南大学 粉末冶金国家重点实验室，长沙 410083;
3. 长沙大学应用化学与环境科学系，长沙410003)
摘 要: 通过力学性能测试和显微组织观察研究了2197合金组织和性能之间的关系。 结果表明： 2197合金具有中等强度、 各向异性小、热稳定性好等特点； 该合金在T8状态下能获得最佳的强度和塑性配合，在T6时效状态以析出少量δ′、θ′和T1相联合强化为主； 在2197合金的相组成中T1相析出数量不占主导地位，Al6Mn弥散质点的析出有利于减少各向异性； 2197合金中Li含量较低，使其呈现较好的热稳定性。
关键字: 2197铝-锂合金; 显微组织; 拉伸性能; 各向异性; 热稳定性
2197 Al-Li alloy
（ 1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China;
3. Department of Applied Chemistry and Environmental Science,
Changsha University, Changsha 410003, China）
Abstract: The relationship between microstructure and properties(including mechanical properties, thermal stability and anisotropy) of 2197Al-Li alloy was studied by tensile test and TEM. The results indicate that 2197 alloy is an alloy with moderate strength, little anisotropy and better thermal stability. 2197 alloy can obtain the optimistical combination of the strength and ductility in T8 temper. The major strengthening phases are a few δ′ particles, θ′ and T1 phases at peakaged condition in T6 temper in 2197 alloy. It is good for lowering the anisotropy because T1 precipitate is not dominant in all precipitates and dispersoid Al6Mn particles precipitate in 2197 alloy. Lower Li concentration makes 2197 alloy have better thermal stability.
Key words: 2197 Al-Li alloy; microstructure; tensile property; anisotropy; thermal stability
