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Effect of varied initial dislocation densities on the anisotropic behavior of creep-aging in Al–Cu–Li alloy

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Abstract

Accurate forming predictions for the third-generation Al–Cu–Li alloys challenged by anisotropic creep-aging (CA) behavior. The creep-aging anisotropic behavior of Al–Cu–Li alloys with different initial dislocation densities is not clear. The anisotropy of creep behavior and yield strength in Al–Cu–Li alloy under high dislocation density (T3) and low dislocation density (T4) conditions have been experimentally investigated. The results show that the in-plane anisotropy (IPA) of creep strain decreased from 59.3% and 50.2% to 7.2% and 8.3% for T4 and T3 samples, respectively. It is found that the T1 phase significantly suppresses the anisotropy of creep strain, the faster the precipitation rate of the T1 phase, the more diffuse the distribution of the inhibitory effect is more obvious, the T1 phase inhomogeneous coarsening of the creep strain inhibition effect is slightly weakened. The yield strength IPA of T4 and T3 samples decreased from 6.88% and 19.47% to 5.66% and 6.41%, respectively. The higher initial dislocation density promotes a uniform and diffuse distribution of the T1 phase, which greatly suppresses the yield strength anisotropy. Different initial dislocation densities lead to different precipitation behaviors of the T1 phase, which should be responsible for the difference in the anisotropy of CA behavior, as is the yield strength.

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Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (Nos. U22A20190 and 52175373), National Natural Science Foundation Joint Fund Key Support Project (U2341273), and the Science and Technology Innovation Program of Hunan Province (2020RC4001).

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Authors and Affiliations

  1. Light Alloys Research Institute, Central South University, Changsha, 410083, China

    Shengmeng Hui, Lihua Zhan, Yongqian Xu, Bolin Ma, Min Xie, Jingpeng Feng & Tong Feng

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

    Lihua Zhan, Yongqian Xu, Bolin Ma & Chang Zhou

  3. State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha, 410083, China

    Lihua Zhan, Yongqian Xu & Bolin Ma

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  1. Shengmeng Hui
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  2. Lihua Zhan
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Contributions

Shengmeng Hui worked in investigation, data curation, and writing—original draft. Lihua Zhan helped in funding acquisition, supervision, and writing—review and editing. Yongqian Xu worked in investigation and formal analysis. Bolin Ma worked in investigation and data curation. Chang Zhou helped in investigation and methodology. Jingpeng Feng helped in investigation and performing experiments. Min Xie helped in investigation and methodology. Tong Feng helped in investigation and experimental equipment.

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Correspondence to Lihua Zhan.

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Hui, S., Zhan, L., Xu, Y. et al. Effect of varied initial dislocation densities on the anisotropic behavior of creep-aging in Al–Cu–Li alloy. J Mater Sci 59, 12661–12676 (2024). https://doi.org/10.1007/s10853-024-09870-4

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