时效处理对新型Al-Li-Cu系合金组织和性能的影响  

Effect of aging treatment on microstructure and mechanical properties of a new Al-Li-Cu alloy

作　　者：杜子龙[1] 曾卫东[1] 杨文华[1] 张超[1] 史春玲[2] 王浩军[2] 周志平[2] 

机构地区：[1]凝固技术国家重点实验室,陕西西安710072 [2]中航工业西安飞机工业(集团)有限责任公司,陕西西安710089

出　　处：《材料热处理学报》2013年第8期85-88,共4页Transactions of Materials and Heat Treatment

基　　金：教育部博士点基金项目(20116102110015)

摘　　要：采用TEM研究了时效处理对一种新型Al-Li-Cu系合金显微组织和力学性能的影响。结果表明:合金中的强化相主要有δ'相、T1相、θ'/θ″相、δ'/β'(Al3Zr)和T1/θ'相。随着时效时间的延长,首先析出大量θ″相和少量θ'相、δ'/β'相,35 h时θ″相减少,θ'相和δ'/β'相增加,37 h时主要为少量θ'相、T1/θ'相和大量T1相;随着时效温度的升高,首先析出大量δ'/β'相和少量θ″相、θ'相,143℃时以δ'、δ'/β'相和θ'相为主,148℃时主要为少量θ'相、T1/θ'相和大量T1相,合金的强度和塑性在143℃×35 h的时效条件下达到了较好的匹配。Effect of aging treatment on microstructure and mechanical properties of a new type A1-Li-Cu alloy was investigated by using TEM analysis. The results show that the main strengthening phases in the alloy are θ＇, T1, 0＇/0＂, δ＇/β＇（A13Zr） and Tl/0＇ phase. With aging time prolonging, a large amount of θ＂ and a small amount of θ＇, δ＇/β＇＇ phases precipitate first, and then the θ″ phase decreases but θ＇, δ＇/β＇ phases increase for the alloy after aging at 143 ℃ for 35 h. A small amount of θ, T1/δ＇/β＇＇ and a large amount of T1 phases are the main phases in the sample for the alloy aged at 143 ℃ for 37 h. With the aging temperature increasing, a large amount of δ＇/β＇ and a small amount of θ＇,θ″ phases precipitate first. 8＇, δ＇/β＇ andθ″ phases are the main phases for the alloy aged at 143 ℃. A small amount of θ″, TI/0＇ and a large amount of T1 phases are the main phases when aged at 148 ℃. A good combination of the strength and plasticity is obtained for the alloy aged at 143 ℃ for 35 h.

关 键 词：铝锂合金 时效处理 强化相 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]