Transactions of Materials and Heat Treatment

Title：Influence of aging and pre-deformation on microstructure and properties for 2195 Al-Li alloy

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ClassificationCode：TG146. 2

year,vol(issue):pagenumber：2023,48(1):216-221

Abstract：

The influences of aging temperature, aging time and pre-deformation amount on the microstructure and mechanical properties for 2195 Al-Li alloy were studied by transmission electron microscope observation and tensile test, and the aging treatment process of Al-Li alloy was optimized. The results show that with the increasing of aging time, the hardness of Al-Li alloys in T6 and T8 states first increases and then decreases, and the aging time corresponding to the peak hardness of Al-Li alloy is shortened after pre-deformation treatment. With the increasing of aging time, the change trends of tensile strength, yield strength and elongation after fracture of Al-Li alloys in T6 and T8 states are the same, and the peak tensile strength, peak yield strength and corresponding elongation after fracture of Al-Li alloy in T8 state after pre-deformation (pre-deformation amount of 5%+175 ℃ /36 h) are increased by 11. 58%, 22. 97% and 17. 78% respectively compared with Al-Li alloy in T6 states (175 ℃ /48 h). Particle δ′ phase, acicular θ′ phase, quasi spherical δ′/ β′ composite phase and acicular T1 phase are exist in Al-Li alloys in both T6 and T8 states, and T1 phase of the latter is finer, more quantity and more even distribution. The suitable aging process and pre-deformation amount of 2195 Al-Li alloy is 175 ℃ /36 h +5%.

Funds：

河南省科技攻关项目(192102310244); 机械工程智能化科研创新团队项目(HNACKT-2020-04)

作者简介: 张义俊(1974-), 女, 博士, 副教授 E-mail: yijun7402@ sina. com

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