(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 通过显微硬度测试、拉伸实验和透射电镜观察，研究不同热处理状态(T6、T8)和微量Zn的添加对WeldaliteTM210Al-Li合金显微组织和拉伸性能的影响。结果表明：WeldaliteTM210Al-Li合金具有很高的强度，在T6状态下，该合金的主要析出强化相是θ′相、δ′相和T1相；而在T8状态下，其主要强化相是δ′相和T1相，预变形促进T1相的析出，提高T8状态下合金的时效强化效果；微量Zn的添加明显促进T1相的析出和弥散分布，使合金强度提高，但Zn的加入使合金塑性略有下降。
关键字: WeldaliteTM210Al-Li合金；Zn；显微组织；力学性能
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of different aging treatments (T6 and T8) and small additions of Zn on the microstructures and the tensile properties of the WeldaliteTM210 alloy were studied by microhardness test, tensile test and TEM. The results indicate that the WeldaliteTM210 alloy has high strength. Under T6 condition, the major strengthening phases of the WeldaliteTM210 alloy are θ′, δ′ and T1 phases. Under T8 condition, the major strengthening phases are δ′ and T1 phases. Predeformation promotes the precipitation of T1 phase. The higher strength in T8 temper is attributed to high volume fraction of T1 phase. The small addition of Zn promotes T1 precipitation and their dispersive distribution, thus increases the strength of the WeldaliteTM210 alloy. But the small addition of Zn has unfavourable effect on the ductility of the WeldaliteTM210 alloy.
Key words: WeldaliteTM210 Al-Li alloy; Zn; microstructure; tensile properties
