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Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

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 (Al2CuLi) 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′ (Al2Cu) 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′ (Al3Li). 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.

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Acknowledgements

Authors thank the National High Technology Research and Development Program of China (No. 2013AA032401) and Teacher’s Research Foundation of Central South University (No. 2013JSJJ 001) for the financial support. The financial support from Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Centre was also greatly appreciated.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Jin-Feng Li, Zhi-Hao Ye, Dan-Yang Liu & Zi-Qiao Zheng

  2. Aerospace Research Institute of Materials and Processing Technology, Beijing, 100076, China

    Yong-Lai Chen, Xu-Hu Zhang & Xiu-Zhi Xu

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  1. Jin-Feng Li
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  2. Zhi-Hao Ye
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Li, JF., Ye, ZH., Liu, DY. et al. Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys. Acta Metall. Sin. (Engl. Lett.) 30, 133–145 (2017). https://doi.org/10.1007/s40195-016-0519-6

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  • DOI: https://doi.org/10.1007/s40195-016-0519-6

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