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Effect of Heat Treatment on the Microstructure and Properties of High Strain Rate Rolled 7050 Aluminum Alloy

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Abstract

High strain rate rolling (HSRR) is developed to improve the strength, plasticity and stress corrosion resistance of 7050 aluminum alloy simultaneously. The volume fraction of the small-angle grain boundary in the HSRRed alloy sheet is 89.9%. TEM shows that the presence of dislocations and sub-grains promotes the precipitation of the second phase. The alloy in the T6 state has the highest strength (622 MPa) and the biggest elongation to rupture (20.6%), but poor corrosion resistance. The over-aged state shows the best corrosion resistance. The RRA state can achieve the tensile strength equivalent to T6 of 614 MPa, the highest yield strength of 561 MPa and corrosion resistance comparable to the over-aged state. TEM observation shows the existence of sub-grains and dislocations plays an important role in the nucleation of the second phase. The high strength can be attributed to the higher volume fraction of the precipitates, and the high plasticity can be attributed to the higher work hardening rate. The better corrosion resistance can be ascribe to the wider precipitate-free zones at the grain boundary and the presence of the larger size second phase particles.

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Acknowledgements

The authors would like to express their sincere gratitude to Mr. Huang and Mr. Wang(Central South University, China) for their assistance in the XRD analysis and the uniaxial tensile testing.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hunan University, Changsha, 410082, People’s Republic of China

    Yang Liao, Hongge Yan, Weijun Xia, Jihua Chen, Bin Su, Xinyu Li & Lu Zhao

  2. Hunan Provincial Key Laboratory of Spray Deposition Technology & Application, Hunan University, Changsha, 410082, People’s Republic of China

    Yang Liao, Hongge Yan, Weijun Xia, Jihua Chen, Bin Su, Xinyu Li & Lu Zhao

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  1. Yang Liao
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  2. Hongge Yan
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Correspondence to Hongge Yan.

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Liao, Y., Yan, H., Xia, W. et al. Effect of Heat Treatment on the Microstructure and Properties of High Strain Rate Rolled 7050 Aluminum Alloy. Met. Mater. Int. 28, 1014–1025 (2022). https://doi.org/10.1007/s12540-020-00961-w

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  • DOI: https://doi.org/10.1007/s12540-020-00961-w

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