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Improvement of Microstructure and Mechanical Properties of Rapid Cooling Friction Stir-welded A1050 Pure Aluminum

  • Metallic Materials
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Abstract

Two-mm thick A1050 pure aluminum plates were successfully joined by conventional and rapid cooling friction stir welding (FSW), respectively. The microstructure and mechanical properties of the welded joints were investigated by electron backscatter diffraction characterization, Vickers hardness measurements, and tensile testing. The results showed that liquid CO2 coolant significantly reduced the peak temperature and increased the cooling rate, so the rapidly cooled FSW joint exhibited fine grains with a large number of dislocations. The grain refinement mechanism of the FSW A1050 pure aluminum joint was primarily attributed to the combined effects of continuous dynamic recrystallization, grain subdivision, and geometric dynamic recrystallization. Compared with conventional FSW, the yield strength, ultimate tensile strength, and fracture elongation of rapidly cooled FSW joint were significantly enhanced, and the welding efficiency was increased from 80% to 93%. The enhanced mechanical properties and improved synergy of strength and ductility were obtained due to the increased dislocation density and remarkable grain refinement. The wear of the tool can produce several WC particles retained in the joint, and the contribution of second phase strengthening to the enhanced strength should not be ignored.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Hohai University, Changzhou, 213200, China

    Nan Xu  (许楠), Lutao Liu, Qining Song, Jianhua Zhao & Yefeng Bao

Authors
  1. Nan Xu  (许楠)
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  2. Lutao Liu
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  3. Qining Song
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  4. Jianhua Zhao
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  5. Yefeng Bao
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Correspondence to Nan Xu  (许楠).

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All authors declare that there are no competing interests.

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Funded by the Natural Science Foundation of Jiangsu Province (No.BK20211067) and “Qing Lan” Project of Jiangsu Province

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Xu, N., Liu, L., Song, Q. et al. Improvement of Microstructure and Mechanical Properties of Rapid Cooling Friction Stir-welded A1050 Pure Aluminum. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 134–141 (2024). https://doi.org/10.1007/s11595-024-2864-z

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  • DOI: https://doi.org/10.1007/s11595-024-2864-z

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