Abstract
The strength and extent of elongation of AA2024 sheets should be improved to realize the fabrication of lightweight components. We prepared high-performance AA2024 strips following a combination of (low-temperature pre-aging + cryorolling + aging) processes and studied their mechanical properties and microstructures. The results showed that the ultimate tensile strength of the material prepared by this process reached 631 MPa, and 10% elongation could be achieved. The microstructure reveals that the process of pre-aging can significantly improve the dislocation density (~ 47.5%) after cryorolling and then improve the strength of the AA2024 sheets following the dislocation strengthening mechanism. It is also found that the cryorolled AA2024 sheets exhibit the \(\gamma \)-fiber texture, similar to asymmetric rolling. Finally, we calculated the yield strength increment of the material and discussed its strengthening source.
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Acknowledgments
The authors thank the National Key Research and Development Program (grant no. 2019YFB2006500), the High-tech Industry Technology Innovation Leading Plan of Hunan Province (grant no. 2020GK2032), the Innovation Driven Program of CSU (no. 2019CX006), and the Research Fund of the Key Laboratory of High Performance Complex Manufacturing at CSU for the financial support.
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Zhou, Y., Xiong, H., Jiang, J. et al. Effect of Pre-aging on Microstructure and Mechanical Properties of Cryorolled AA2024 Sheets. JOM 75, 2935–2948 (2023). https://doi.org/10.1007/s11837-022-05616-2
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DOI: https://doi.org/10.1007/s11837-022-05616-2