Abstract
The microstructure, mechanical properties, and intergranular corrosion (IGC) susceptibility of peak-aged 2195 Al-Cu-Li alloy at different temperatures were investigated. The results showed that the microhardness and tensile properties of the alloy were significantly improved by increasing the aging temperature, while the ductility and corrosion resistance decreased. The medium-temperature aged sample could obtain optimal mechanical properties and acceptable corrosion resistance in comparison with other samples. A competitive relationship was observed between T1 (Al2CuLi) and θ' (Al2Cu) phases during aging treatment, where a higher aging temperature promoted nucleation of the T1 phase, which played the dominant role in strengthening the alloy. However, the θ' phase precipitation was inhibited. The improvement of corrosion susceptibility was mainly related to fine intragranular precipitates, continuous grain boundary precipitates, and a narrow precipitate-free zone. Furthermore, the relationship between the open circuit potential and the IGC sensitivity was discussed to determine the corrosion mechanism of the alloy.
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Acknowledgment
This work was supported by the National Foundation of China (No.414010003), the Changsha Municipal Natural Science Foundation (kq2007085) and the Project of Changsha Science and Technology (k1705013). The authors would prefer to thank Mrs. Yingchun Wan for the help of sample preparation and paper writing.
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Xia, L., Li, Y., Huang, M. et al. Influence of Aging Treatment on the Corrosion Susceptibility and Mechanical Properties of Peak-Aged 2195 Al-Cu-Li Alloy. J. of Materi Eng and Perform 31, 631–642 (2022). https://doi.org/10.1007/s11665-021-06158-5
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DOI: https://doi.org/10.1007/s11665-021-06158-5