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Towards aging in a multipass friction stir–processed АА2024

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Abstract

Multipass friction stir processing was applied to AA2024 8-mm-thick samples with the goal of studying the microstructural evolution of the metal processed. Up to three parallel FSP tracks with an overlap of 0.375 between the neighboring ones have been obtained on the samples and then characterized for microstructure and mechanical strength. Clear macroscopic zones between the tracks have been observed. The specificity of microstructural evolution in the fine crystalline part of the thermo-mechanically affected zone formed close to the stirring zone is its over-aging due to less intensive strain dissolution of precipitates as compared with that of the stirring zone. The minimum hardness zone is formed there while higher hardness is observed in the less deformed part of the zone due to S(S′) (Al2CuMg) precipitates. The thermo-mechanically affected zone formation was considered from the viewpoint of tribology when the stirring zone metal flow slides over the thermo-mechanically affected zone metal and deforms it.

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Acknowledgments

This study was performed within the frame of the Fundamental Research Program of the State Academies of Sciences for 2013–2020, line of research III.23.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science SB RAS, Tomsk, Russian Federation

    K. N. Kalashnikov, S. Yu. Tarasov, A. V. Chumaevskii, S. V. Fortuna, A. A. Eliseev & A. N. Ivanov

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  1. K. N. Kalashnikov
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  2. S. Yu. Tarasov
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  3. A. V. Chumaevskii
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  4. S. V. Fortuna
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  5. A. A. Eliseev
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  6. A. N. Ivanov
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Correspondence to S. Yu. Tarasov.

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Kalashnikov, K.N., Tarasov, S.Y., Chumaevskii, A.V. et al. Towards aging in a multipass friction stir–processed АА2024. Int J Adv Manuf Technol 103, 2121–2132 (2019). https://doi.org/10.1007/s00170-019-03631-3

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  • DOI: https://doi.org/10.1007/s00170-019-03631-3

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