Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
- (1)
- CR can significantly improve the tensile strength and ductility of Al-Cu-Li alloy sheets, the best ultimate tensile strength of 502 MPa was achieved for the specimens subjected to CR at −190 °C, and the best ductility of 11.1% was obtained for the specimens subjected to CR at −100 °C before aging. The highest ultimate tensile strength of 549 MPa and the elongation rate of 13.9% was achieved simultaneously when the sheets were processed by CR at −190 °C and subsequence aging for 10 h.
- (2)
- The mechanical properties of Al-Cu-Li alloy sheets are dependent on the grain sizes, precipitations and clusters, the dislocation microstructure, and the back stress distribution during rolling. Grains in cryorolled samples were seriously refined compared to that in the alloy processed by HR. Numerous deformation-induced dislocation networks were observed. HDDZ and LDDZ occurred in the hot-rolled samples, while it distributed uniformly with a more arranged direction in the cryorolled samples. After aging at 160 °C for 10 h, grains size slightly increased compared to that in the alloy rolled at the corresponding temperature. The deformation-induced dislocations can facilitate the nucleation and growth of the main strengthening phases θ’, which resulted in enhanced strength.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Composition (Wt%) | Cu | Mg | Zn | Li | Ag | Mn | Zr | Al |
---|---|---|---|---|---|---|---|---|
Al-Cu-Li alloy | 3.72 | 0.58 | 0.46 | 0.96 | 0.30 | 0.58 | 0.31 | 91.6 |
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Wang, L.; Kong, C.; Tandon, P.; Pesin, A.; Pustovoytov, D.; Yu, H. Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy. Metals 2021, 11, 853. https://doi.org/10.3390/met11060853
Wang L, Kong C, Tandon P, Pesin A, Pustovoytov D, Yu H. Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy. Metals. 2021; 11(6):853. https://doi.org/10.3390/met11060853
Chicago/Turabian StyleWang, Lin, Charlie Kong, Puneet Tandon, Alexander Pesin, Denis Pustovoytov, and Hailiang Yu. 2021. "Effect of Rolling Temperature and Subsequence Ageing on the Mechanical Properties and Microstructure Evolution of an Al-Cu-Li Alloy" Metals 11, no. 6: 853. https://doi.org/10.3390/met11060853