(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 通過顯微硬度測試、拉伸實驗和透射電鏡觀察，研究不同熱處理狀態(tài)(T6、T8)和微量Zn的添加對WeldaliteTM210Al-Li合金顯微組織和拉伸性能的影響。結(jié)果表明：WeldaliteTM210Al-Li合金具有很高的強度，在T6狀態(tài)下，該合金的主要析出強化相是θ′相、δ′相和T1相；而在T8狀態(tài)下，其主要強化相是δ′相和T1相，預(yù)變形促進T1相的析出，提高T8狀態(tài)下合金的時效強化效果；微量Zn的添加明顯促進T1相的析出和彌散分布，使合金強度提高，但Zn的加入使合金塑性略有下降。
關(guān)鍵字: WeldaliteTM210Al-Li合金；Zn；顯微組織；力學(xué)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
