Abstract
Spray-deposited 7034 Al alloy processed by forward extrusion has good application prospect in manufacturing structure components of aerospace equipment, due to super-high strength achieved by hot deformation and heat treatment. To manufacture high-performance 7034 Al alloy structure components used in aerospace equipment, it is critical to find out an effective heat treatment scheme and a reasonable hot processing window for spray-deposited 7034 Al alloy processed by forward extrusion. This paper attempted to investigate the mechanical properties and the hot deformation behaviors of spray-deposited 7034 Al alloy processed by forward extrusion. Firstly, the tensile tests were performed to evaluate the mechanical properties of this alloy undergoing various heat treatment, and it was found this alloy obtained excellent mechanical properties (the ultimate strength reached 796 MPa and the elongation reached 10.6%) by two-stage solution (450 °C for 1 h +475 °C for 1 h) and two-stage aging (80 °C for 8 h +120 °C for 8 h). Secondly, isothermal compression (IC) tests were performed under the deformation conditions of 330-450 °C and 0.01-10 /s to investigate the hot deformation behavior of this alloy. Based on the data from IC tests, processing maps (MPs) and the constitutive equation of this alloy were established, and the hot processing window for this alloy was ascertained to be within the range of 340-450 °C and 0.01-0.81 /s. Finally, through characterizing the microstructures of specimens used for the tensile tests and IC tests, the improvement mechanism of the mechanical properties of this alloy after heat treatment was revealed as well as the hot deformation mechanism of this alloy. The research results can provide theoretical guideline for manufacturing high-performance 7034 Al alloy structure components used in aerospace equipment.
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Acknowledgments
The authors would like to thank the Fundamental Research Funds for the Central Universities (WHUT, no. 2019-YB-016) for the support offered to this work.
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Tian, D., Wang, R. & Zheng, J. Research on the Mechanical Properties and Hot Deformation Behaviors of Spray-Deposited 7034 Al Alloy Processed by Forward Extrusion. J. of Materi Eng and Perform 31, 37–52 (2022). https://doi.org/10.1007/s11665-021-06166-5
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DOI: https://doi.org/10.1007/s11665-021-06166-5