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Creep behavior and mechanical properties of Al-Li-S4 alloy at different aging temperatures

时效温度对Al-Li-S4 合金的蠕变行为和力学性能的影响

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Abstract

Creep age forming techniques have been widely used in aerospace industries. In this study, we investigated the effect of aging temperature (143 °C–163 °C) on the creep behavior of Al-Li-S4 aluminum alloy and their mechanical properties at room temperature. The mechanical properties were tested by tensile testing, and the microstructural evolution at different aging temperatures was examined by transmission electron microscopy. Results show that the creep strains and the room-temperature mechanical properties after creep aging increase with the aging temperature. As the aging temperature increases, the creep strain increases from 0.018% at 143 °C to 0.058% at 153 °C, and then to 0.094% at 163 °C. Within 25 h aging, the number of creep steps increases and the duration time of the same steps is shortened with the growth of aging temperatures. Therefore, the increase in aging temperatures accelerates the progress of the entire creep. Two main strengthening precipitates θ′ (Al2Cu) and T1 (Al2CuLi) phases were characterized. This work indicates that the creep strain and mechanical properties of Al-Li-S4 alloys can be improved by controlling aging temperatures.

摘要

蠕变时效成形技术已经在航空航天领域得到了广泛的应用. 本文研究了时效温度(143 °C-163 °C)对Al-Li-S4 合金的蠕变行为和室温力学性能的影响.进行了力学性能拉伸测试和透射电镜下微 观结构表征实验, 结果表明: 时效温度的升高,使得蠕变量及其对应的室温力学性能都会增加, 具体 表现为蠕变量从143 °C 时的0.018%增加到153 °C 时的0.058%,进一步增加到163 °C 时的0.094%. 在时效的25 h 内, 温度的升高使得蠕变阶段的数量增加, 而对应的蠕变阶段保持的时间缩短. 因此, 时效温度的升高加速了蠕变时效进程. 同时, 对两种主要的强化相, θ′ (Al2Cu)相和T1(Al2CuLi)相进 行了表征. 研究表明, 通过调控时效温度. 可以获得Al-Li-S4 合金的蠕变量和力学性能的改善.

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Authors and Affiliations

  1. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Chang Zhou  (周畅), Li-hua Zhan  (湛利华), Ru-lin Shen  (申儒林), Xing Zhao  (赵兴), Hai-liang Yu  (喻海良), Ming-hui Huang  (黄明辉), He Li  (李贺), You-liang Yang  (杨有良) & Li-bin Hu  (胡立彬)

  2. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Chang Zhou  (周畅), Li-hua Zhan  (湛利华), Ru-lin Shen  (申儒林), Xing Zhao  (赵兴), Hai-liang Yu  (喻海良), Ming-hui Huang  (黄明辉), He Li  (李贺), You-liang Yang  (杨有良) & Li-bin Hu  (胡立彬)

  3. Beijing Institute of Aerospace Systems Engineering, Beijing, 100076, China

    De-bo Liu  (刘德博) & Zheng-gen Hu  (胡正根)

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  1. Chang Zhou  (周畅)
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  2. Li-hua Zhan  (湛利华)
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  7. He Li  (李贺)
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Correspondence to Li-hua Zhan  (湛利华) or Xing Zhao  (赵兴).

Additional information

Foundation item: Project(2017YFB0306300) supported by National key R&D Program of China; Project(zzyikt2015-05) supported by the Project of State Key Laboratory of High Performance Complex Manufacture, China

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Zhou, C., Zhan, Lh., Shen, Rl. et al. Creep behavior and mechanical properties of Al-Li-S4 alloy at different aging temperatures. J. Cent. South Univ. 27, 1168–1175 (2020). https://doi.org/10.1007/s11771-020-4357-3

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  • DOI: https://doi.org/10.1007/s11771-020-4357-3

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