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The effect of impulses on precipitation behavior in 7075-T6 aluminum alloy joint by impulse friction stir welding

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Abstract   

Joining procedure for aluminum alloy 7075-T6 (AlZnMgCu1.5) sheets was realized by impulse friction stir welding (IFSW) with different impulse frequencies. The additional mechanical impulses during IFSW enhance the forging action of the tool, resulting in the weld microstructure modification. The microstructural evolution in different zones of the weld (SZ and HAZ) was studied, focusing on the strengthening precipitation behavior of the welded joint as well as the overall mechanical properties. The results illustrate that the application of impulses during IFSW in SZ of the weld accelerates the reprecipitation and dynamic recrystallization processes, which lead to the formation of strengthening precipitates and the homogeneous grain microstructure, respectively. HAZ of the welds obtained by the FSW and IFSW represent dislocation-free grain interior, and the strengthening precipitation behavior was completely different: the HAZ of conventional FSW welds exhibits a high concentration of stable η phase, while in the HAZ of IFSW joints shows a high concentration of heat-sensitive η' precipitates, suggesting that even in the HAZ, only additional deformation generated by mechanical impulses even in HAZ is responsible for the induced formation of GP zones and after the transformation of GP zones to the metastable η' precipitates.

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Funding

This work was funded by the Ministry of Science and Higher Education of the Russian Federation as part of the World-class Research Center program: Advanced Digital Technologies (contract No. 075–15-2020–903 dated 16.11.2020).

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Authors and Affiliations

  1. Peter the Great St. Petersburg Polytechnic University, 195251, St. Petersburg, Russian Federation

    Keqi Wang, Anton Naumov, Fedor Isupov, Ahmad Alali Alkhalaf & Oleg Panchenko

  2. Institute of Laser and Welding Technologies, St. Petersburg State Marine Technical University, 190121, St. Petersburg, Russian Federation

    Marina Gushchina

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  1. Keqi Wang
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Contributions

Conceptualization, A.N.; methodology, A.N. and O.P.; formal analysis, M.G., K.W., A.A.A.; investigation, K.W., M.G., A.N., F.I.; resources, A.N., O.P., M.G.; data curation, K.W. and F.I.; writing—original draft preparation, K.W., A.N., A.A.A.; writing—review and editing, O.P.; visualization, K.W. and G.M.; supervision, A.N. and O.P.; project administration, A.N. and O.P.; funding acquisition, A.N. and O.P.

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Correspondence to Keqi Wang.

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Wang, K., Naumov, A., Gushchina, M. et al. The effect of impulses on precipitation behavior in 7075-T6 aluminum alloy joint by impulse friction stir welding. Int J Adv Manuf Technol 128, 373–389 (2023). https://doi.org/10.1007/s00170-023-11872-6

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