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<p>In recent years, additive friction stir deposition (AFSD) has emerged as a promising solid-state additive manufacturing technique, particularly suitable for aluminum alloys. In this study, a 48-layers, 72&#xa0;mm-high Al–Mg alloy deposit was successfully fabricated using AFSD. It reveals the internal relationship between the microstructure and mechanical properties within the deposit. The deposit exhibits an extremely fine recrystallization microstructure. Dynamic recrystallization occurred, with the average grain sizes at the top, center, and bottom of the deposit being 2.9&#xa0;μm, 4.8&#xa0;μm, and 8.0&#xa0;μm, respectively. Compared to the build direction (BD), the longitudinal direction (LD) exhibited superior tensile properties, with both yield strengths surpassing those of the base material, reaching 225&#xa0;MPa and 213&#xa0;MPa, respectively, the strengthening mechanisms were investigated. Dislocation strengthening and grain-boundary strengthening played significant roles in enhancing the strength of the deposited Al–Mg alloy, while solid solution strengthening was identified as the dominant mechanism.</p> Graphical Abstract <p></p>

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Microstructure and mechanical properties of Al–Mg alloy manufactured by additive friction stir deposition

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Yebo Jiang,
  • Zhiwei Wei,
  • Huaishen Wang,
  • Dan Luo,
  • Hongxia Zhang,
  • Peng Dong

摘要

In recent years, additive friction stir deposition (AFSD) has emerged as a promising solid-state additive manufacturing technique, particularly suitable for aluminum alloys. In this study, a 48-layers, 72 mm-high Al–Mg alloy deposit was successfully fabricated using AFSD. It reveals the internal relationship between the microstructure and mechanical properties within the deposit. The deposit exhibits an extremely fine recrystallization microstructure. Dynamic recrystallization occurred, with the average grain sizes at the top, center, and bottom of the deposit being 2.9 μm, 4.8 μm, and 8.0 μm, respectively. Compared to the build direction (BD), the longitudinal direction (LD) exhibited superior tensile properties, with both yield strengths surpassing those of the base material, reaching 225 MPa and 213 MPa, respectively, the strengthening mechanisms were investigated. Dislocation strengthening and grain-boundary strengthening played significant roles in enhancing the strength of the deposited Al–Mg alloy, while solid solution strengthening was identified as the dominant mechanism.

Graphical Abstract