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The microstructures and tensile properties of high-strength Al-Li alloy Al-4.15Cu-1.25Li-X sheet containing 0.09% and 0.23% Ce in the states of with T6 aging (aging at 175 ℃) and T8 aging (5% cold rolling pre-deformation and aging at 155 ℃) were investigated. The result shows that comparing with T6 aging, both the strength and the elongation of Al-Li alloy with T8 aging are enhanced. Meanwhile, the strength and elongation of the T8-aged alloy containing 0.23% Ce are lower than those of the alloy containing 0.09% Ce. However, Ce concentration increased does not change the precipitate type, and the aging precipitates are still T1(Al2CuLi)and θ′(Al2Cu) phases, but their amounts are decreased. Thus, the addition of Ce causes the formation of Ce-contained and Cu-rich particles Al8Cu4Ce, which cannot be completely dissolved into the alloy matrix during homogenization and solution process. Finally, the concentration of dissolved Cu in solid solution is decreased with increasing of Ce concentration in the Al-Li alloy, which decreases the fraction of Cu-containing precipitates T1 and θ′ after aging and weakens the alloy strength.
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［1］李劲风, 郑子樵, 陈永来, 等. 铝锂合金及其在航天工业上的应用[J]. 宇航材料工艺, 2012，42(1): 13-19.Li J F, Zheng Z Q, Chen Y L, et al. Al-Li alloys and their application in aerospace industry[J]. Aerospace Materials & Technology, 2012, 42(1): 13-19.
［2］曹大力, 石忠宁, 杨少华, 等. 稀土在铝及铝合金中的作用[J]. 稀土, 2006, 27(5): 88-93.Cao D L, Shi Z N, Yang S H, et al. Effects of rare earth on aluminium and its alloys [J]. Chinese Rare Earths, 2006, 27(5): 88-93.
［3］李红英, 孙远, 宾杰, 等. Ce 对耐热铝导体材料铸态组织和性能的影响[J]. 中南大学学报：自然科学版, 2011, 42(10): 3026-3032.Li H Y, Sun Y, Bin J, et al. Effect of cerium on as-cast microstructure and properties of heat-resistant aluminum conductor[J]. Journal of Central South University：Science and Technology, 2011, 42(10): 3026-3032.
［4］胡桂云, 陈送义, 姜慧丽, 等. 稀土Ce对7A52铝合金组织与性能的影响[J]. 中国有色金属学报, 2016, 26(7): 1372-1382.Hu G Y, Chen S Y, Jiang H L, et al. Effect of RE Ce on microstructure and properties of 7A52 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals, 2016, 26(7): 1372-1382.
［5］肖代红, 王健农, 丁冬雁, 等. 微量Ce和Ti对AlCuMgAg合金组织和性能的影响[J]. 稀有金属材料与工程, 2004, 33(4):404-407. Xiao D H, Wang J N, Ding D Y, et al. Effect of Ce and Ti doping on microstructure and properties of the alloy AlCuMgAg [J]. Rare Metal Materials and Engineering, 2004, 33(4):404-407.
［6］Yu X X, Yin D F, Yu Z M. Effects of cerium and zirconium microalloying addition on the microstructures and tensile properties of novel Al-Cu-Li alloys [J]. Rare Metal Materials and Engineering, 2016, 45(8): 1917-1923.
［7］Yu X X, Yin D F, Yu Z M, et al. Effects of cerium addition on solidification behaviour and intermetallic structure of novel Al-Cu-Li alloys [J]. Rare Metal Materials and Engineering, 2016, 45(6): 1423-1429.
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