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

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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.

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun, 130025, China

    Yu-peng Li, Da-qian Sun & Liang Liu

  2. School of Materials Science and Engineering, Jilin University, Changchun, 130025, China

    Yu-peng Li, Da-qian Sun & Liang Liu

  3. Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China

    Yu-peng Li & Wen-biao Gong

  4. School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China

    Yu-peng Li & Wen-biao Gong

Authors
  1. Yu-peng Li
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  2. Da-qian Sun
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  3. Wen-biao Gong
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  4. Liang Liu
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Correspondence to Yu-peng Li.

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Li, Yp., Sun, Dq., Gong, Wb. et al. 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, 849–857 (2019). https://doi.org/10.1007/s12613-019-1800-2

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  • DOI: https://doi.org/10.1007/s12613-019-1800-2

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