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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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