Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy

Yu-peng Li; Da-qian Sun; Wen-biao Gong; Liang Liu

doi:10.1007/s12613-019-1800-2

Volume 26 Issue 7

Jul. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(7): 849-857

Yu-peng Li, Da-qian Sun, Wen-biao Gong, and Liang Liu, Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 849-857. https://doi.org/10.1007/s12613-019-1800-2

Cite this article as:

Yu-peng Li, Da-qian Sun, Wen-biao Gong, and Liang Liu, Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 849-857. https://doi.org/10.1007/s12613-019-1800-2

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Research Article

Effects of postweld aging on the microstructure and properties of bobbin tool friction stir-welded 6082-T6 aluminum alloy

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Corresponding author:
Da-qian Sun E-mail: Sundq@jlu.edu.cn
Received: 11 September 2018; Revised: 26 December 2018; Accepted: 2 January 2019

Abstract

Abstract

Samples of 6082-T6 aluminum alloy were subjected to bobbin tool friction stir welding (BT-FSW), and the joints were treated by postweld natural aging (PWNA) and postweld artificial aging (PWAA). The microstructure, microhardness, and tensile properties of the aged and as-welded specimens were investigated. Transmission electron microscopy (TEM) observations revealed that a large number of Guinier-Preston (GP) zones precipitated in the form of a network on the stir zone (SZ) after PWNA for 60 d, and a large number of β" phases precipitated in the matrix for after PWAA for 6 h. As the aging time increased, the microhardness of the SZ and the thermomechanically affected zone (TMAZ) increased significantly, and the hardness of the SZ after PWAA for 6 h was close to that of the base metal (BM). With increasing PWNA time, the strength and strain increased slightly. When the PWAA time increased, the strength clearly increased, with a maximum value of 279.9 MPa after 6 h, while the strain decreased.
- postweld aging;
- aluminum alloys;
- bobbin tool friction stir welding;
- microstructure;
- properties

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References

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