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The influence of pre-deformation on aging precipitates of three near peak-aged Al–Cu–Li alloys,1460 alloy with a low Cu/Li ratio(1.46),2050 alloy with a high Cu/Li ratio(4.51) and 2A96 alloy with a medium Cu/Li ratio(2.97),was investigated.The strength of the aged alloys is enhanced by the pre-deformation.The effectiveness of pre-deformation on precipitates is dependent on the alloy’s composition.With increasing the pre-deformation,the population density of T1(Al_2Cu Li) precipitates increases in all three Al–Cu–Li alloys and their diameter decreases in 2050 and 2A96 alloys,and the greatest effectiveness is observed in 2A96 alloy.The pre-deformation also increases the population density of θ’(Al_2Cu)precipitates and decreases their diameter in 2050 and 2A96 Al–Li alloys,but the effectiveness is smaller compared to that on T1 precipitates.In 1460 alloy subjected to two-step aging at 130 °C for 20 h followed by 160 °C for 12 h,the main precipitates are δ’(Al_3Li).At 2%–6% pre-deformation,GP-I zones form and pre-deformation displays little influence.Eight percentage pre-deformation promotes θ’’/θ’ precipitation and increases their population density.
The influence of pre-deformation on aging precipitates of three near peak-aged Al-Cu-Li alloys, 1460 alloy with a low Cu / Li ratio (1.46), 2050 alloy with a high Cu / Li ratio with a medium Cu / Li ratio (2.97), was investigated. The strength of the aged alloys is enhanced by the pre-deformation. The effectiveness of pre-deformation on precipitates is dependent on the alloy’s composition. Increasing the pre-deformation, the population density of T1 (Al_2Cu Li) precipitates increases in all three Al-Cu-Li alloys and their diameters decrease in 2050 and 2A96 alloys, and the greatest effectiveness is observed in 2A96 alloy.The pre-deformation also increases the population density of θ ’(Al 2 Cu) precipitates and decreases their diameter in 2050 and 2A96 Al-Li alloys, but the effectiveness is smaller than to on T1 precipitates. In 1460 alloy subjected to two-step aging at 130 ° C for 20 h followed by 160 ° C for 12 h, the main precipitates are δ ’(Al_3Li) .At 2% -6% Pre-deformation, GP-I zones form and pre-deformation displays little influence. Energy percentage pre-deformation promotes θ ’/ θ’ precipitation and increases their population density.