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Microstructural Characteristics and Mechanical Properties of Friction Stir Welded 2219 Aluminum Alloy Plate After Spinning and Heat Treatment

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Abstract

A 3.2 mm thin-walled 2219 aluminum alloy hemisphere shell was successfully fabricated by friction stir welding (FSW) combined with spinning and subsequent T6 treatment. The microstructural characteristics and the mechanical properties of the spun FSWed alloy were investigated. The results showed that the differences in microstructure of the base material and the joint were greatly improved during the spinning process, which consisted of fine dynamic recrystallization (DRX) grains with an average grain size of 4.7 μm and 6.6 μm, respectively. The microstructure and the mechanical properties of the joint were similar to the base material. After the solid solution, the uniformly distributed θ phase particles were greatly dissolved in the Al matrix and the growth of the grains was promoted. Besides, the dislocation densities were significantly decreased. However, a large quantity of needle-like θ′ phase precipitates evenly distributed in the matrix after T6 treatment. Moreover, the strengths were further improved to 291.6 MPa and 331.8 MPa after T6 treatment due to the high density of θ′ precipitates by hindering the dislocation movement.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Z. L. Chang, M. H. Huang & L. H. Zhan

  2. Beijing Institute of Astronautical Systems Engineering, Beijing, 100076, People’s Republic of China

    Z. L. Chang & X. B Wang

  3. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, People’s Republic of China

    J. Q. Pan, G. D. Sun, J. L. Yang, L. Zhou & W. C. Zhang

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  1. Z. L. Chang
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  2. M. H. Huang
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Chang, Z.L., Huang, M.H., Wang, X.B. et al. Microstructural Characteristics and Mechanical Properties of Friction Stir Welded 2219 Aluminum Alloy Plate After Spinning and Heat Treatment. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09438-y

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  • DOI: https://doi.org/10.1007/s11665-024-09438-y

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