Abstract
Dislocation tangle and coarse precipitate segregation cause incalculable damage to the strength and ductility of high-strength Al-Zn-Mg-Cu aluminum alloys. These drawbacks are inevitable for the alloys undergoing deformation and artificial aging. In this work, electroshock treatment (EST) was successfully introduced between deformation and artificial aging of the alloys to improve their strength and ductility. The uniaxial tensile test results show that the elongation of the samples with EST could increase by 28.8%, and the ultimate strength simultaneously increases by 20 MPa relative to that without EST samples. Through microstructure characterization, it was found that EST eliminates dislocation tangle resulting from pre-stretching in the material. Furthermore, the distribution of coarse precipitates in EST samples is more uniform, and the size of precipitates is smaller in comparison with non-EST samples. The dislocation evolution induced by EST could be attributed to the non-equilibrium scattering of electron-dislocation, and a kinetic model for nucleation and growth of precipitates has been proposed to reveal the mechanism of precipitate evolution.
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Acknowledgements
This work was financially supported by the National Key R&D Program of China (No. 2020YFA0714900), the National Natural Science Foundation of China (Grant No. 51975440,52205410), the Project funded by China Postdoctoral Science Foundation (Grant No. 2022M712482), the Natural Science Foundation of Hubei Province (2022CFB846), the 111 Project (Grant No. B17034), and the Innovative Research Team Development Program of Ministry of Education of China (Grant No. IRT17R83).
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Wenlin Wu: Conceptualization, Methodology, Writing–original draft, Investigation. Yanli Song: Funding acquisition, Writing–review & editing. Pu Zhou: Methodology, Data curation, Investigation. Jue Lu: Data curation. Lin Hua: Supervision, Writing–review & editing.
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Wu, W., Song, Y., Zhou, P. et al. Achieving High-Strength Ductility Property in a Microstructure Homogenization Al-Zn-Mg-Cu Alloy by Electroshock Treatment. JOM (2024). https://doi.org/10.1007/s11837-024-06697-x
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DOI: https://doi.org/10.1007/s11837-024-06697-x