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Effect of Ti content on microstructures and mechanical properties of cast Al-2Li-2Cu-0.5Mg alloy

Time：2023-07-01　　　Hits：6865

Title: Effect of Ti content on microstructures and mechanical properties of cast Al-2Li-2Cu-0.5Mg alloy

DOI: https://doi.org/10.1007/s41230-023-3036-z

Author: You-jie Guo, Dong-chen Yang, *Liang Zhang, **Guo-hua Wu, Yi-xiao Wang, Pei-sen Li, Guang-xiao Ren, Liang-bin Li, and Xun-man Xiong

Corresponding author:

*Liang Zhang

Ph. D, Associate Researcher. His research interests mainly focus on the microstructures and mechanical properties of cast Al-Li-Cu alloys.

E-mail: liangzhang08@sjtu.edu.cn
**Guo-hua Wu
Ph. D, Professor. His research interests mainly focus on the microstructures and mechanical properties of high-performance cast Al and Mg alloys.
E-mail: ghwu@sjtu.edu.cn

Abstract: Ti is regarded as one of the promising grain refiners in cast Al-Li-Cu alloys, but few research works have been done on its independent role. In this study, the effect of Ti on the microstructure evolution and mechanical properties of cast Al-2Li-2Cu-0.5Mg base alloy was investigated. The results revealed that the grains can be prominently refined with the increase of Ti addition. After adding Ti, high density TiB2-Al3Ti composite particles with a low lattice misfit form as heterogeneous nucleation sites for the α-Al matrix. δ'(Al3Li) and T1(Al2CuLi) precipitates that provide enhanced strength are dominated in the alloys after T6 aging treatment. The average size of both δ' and half-width of δ'-precipitation free zone (PFZ) decreases gradually with the increase of Ti content. This is because the higher binding energy between Ti atoms and vacancies limits the diffusion efficiency of Li atoms, and thus results in a higher ductility. Additionally, no nano-sized Al3Ti or core-shell structure of Al3(Li, Ti) particles are found. The tensile property test results indicate that the Al-2Li-2Cu-0.5Mg alloy achieves optimal properties after aging at 175 °C for 32 h when 0.15wt.% Ti is added. It exhibits a yield strength of 352±5 MPa, an ultimate tensile strength of 423±6 MPa, and an elongation of (3±0.4)%. These findings are expected to offer a reliable theoretical guidance for the industrial composition design of the Al-Li-Cu series cast alloys.

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