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Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al–Cu–Li Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The investigation concentrates on friction stir welded (FSW) Al–Cu–Li alloy concerning its local microstructural evolution and mechanical properties. The grain features were characterized by electron back scattered diffraction (EBSD) technology, while precipitate characterization was conducted by using transmission electron microscopy (TEM) aligned along [011]Al and [001]Al zone axes. The mechanical properties are evaluated through micro-hardness and tensile testing. It can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization (DRX), primarily occurring in continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX). In the thermal–mechanically affected zone (TMAZ), numerous sub-structured grains, exhibiting an elongated morphology, were created due to partial DRX, signifying the dominance of CDRX, DDRX, and geometric dynamic recrystallization (GDRX) in this region. T1 completely dissolves in the nugget zone (NZ) leading to the formation of Guinier–Preston zones and increase of δ′, β′ and S′. Conversely, T1 partially solubilizes in TMAZ, the lowest hardness zone (LHZ) and heat affected zone (HAZ), and the residual T1 undergoes marked coarsening, revealing various T1 variants. The solubilization and coarsening of T1 are primary contributors to the degradation of hardness and strength. θ′ primarily dissolves and coarsens in NZ and TMAZ, whilst this precipitate largely coarsens in HAZ and LHZ. σ, TB, grain boundary phases (GBPs) and precipitate-free zone (PFZ) are newly generated during FSW. σ exists in the TMAZ, LHZ and HAZ, whereas TB nucleates in NZ. GBPs and PFZ mostly develop in LHZ and HAZ, which can cause strain localization during tensile deformation, potentially leading to LHZ joint fracture.

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Acknowledgements

This research is financially supported by the Natural Science Foundation of Sichuan Province (2023NSFSC0915), the Postdoctoral Research Project Special Fund of Sichuan Province and Natural Science Starting Project of SWPU (2023QHZ017).

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Authors and Affiliations

  1. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China

    Peng Chen, Wenhao Chen, Zhiyu Chen & Bensheng Huang

  2. Sichuan Provincial Engineering Research Center of Advanced Materials Manufacturing Technology for Shale Gas High-Efficient Exploitation, Southwest Petroleum University, Chengdu, 610500, China

    Peng Chen & Bensheng Huang

  3. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

    Peng Chen, Jiaxin Chen & Zhiqing Zhang

  4. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

    Yang Tang

  5. School of Robot Engineering, Yangtze Normal University, Chongqing, 408100, China

    Ge Liu

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  1. Peng Chen
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Chen, P., Chen, W., Chen, J. et al. Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al–Cu–Li Alloy. Acta Metall. Sin. (Engl. Lett.) (2024). https://doi.org/10.1007/s40195-024-01674-4

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  • DOI: https://doi.org/10.1007/s40195-024-01674-4

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