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<p>The microstructure, mechanical properties, and corrosion resistance of friction stir additive manufacturing (FSAM)-produced AA7075/316L composites were investigated via multi-scale characterization, mechanical testing, and electrochemical analysis. The results reveal the formation of an amorphous layer with a thickness of about 100&#xa0;nm at the interface, accompanied by a small number of intermetallic compounds (IMCs) near the Al side of the amorphous layer. Dynamic recrystallization and recovery phenomena were observed in the AA7075 aluminum alloy under mechanical stirring, leading to significant grain refinement with an average size of 3.3 ± 1.1&#xa0;μm. Tensile strength and yield strength of composites were 413&#xa0;MPa and 227&#xa0;MPa, respectively, with an elongation of 10.9%. The corrosion current density and polarization resistance of composites were 1.35 × 10<sup>−6</sup>A/cm<sup>2</sup> and 1.83 × 10<sup>4</sup> Ω cm<sup>2</sup>, respectively. In 3.5 wt% NaCl solution at room temperature (25 ℃), there are pitting corrosion and intergranular corrosion on AA7075 aluminum alloy side of the amorphous layer. However, on 316L stainless steel side, no obvious corrosion occurs. The corrosion reaction is predominantly triggered by the synergistic effects of the high corrosion driving force induced by the significant potential difference between AA7075 aluminum alloy and 316L stainless steel, and micro-galvanic corrosion initiated by second-phase particles (MgZn₂, Al₇Cu₂Fe) in the matrix of AA7075 aluminum alloy.</p> Graphical Abstract <p></p>

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Investigation on Interface Corrosion Behavior and Mechanism of AA7075/316 l Composites Prepared by Friction Stir Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Dingyao Fu,
  • Chengbo Li,
  • Xuejun Zheng,
  • Shengdan Liu,
  • Tie Yi,
  • Wengang Chen,
  • Xi Xu,
  • Qinyao Chen

摘要

The microstructure, mechanical properties, and corrosion resistance of friction stir additive manufacturing (FSAM)-produced AA7075/316L composites were investigated via multi-scale characterization, mechanical testing, and electrochemical analysis. The results reveal the formation of an amorphous layer with a thickness of about 100 nm at the interface, accompanied by a small number of intermetallic compounds (IMCs) near the Al side of the amorphous layer. Dynamic recrystallization and recovery phenomena were observed in the AA7075 aluminum alloy under mechanical stirring, leading to significant grain refinement with an average size of 3.3 ± 1.1 μm. Tensile strength and yield strength of composites were 413 MPa and 227 MPa, respectively, with an elongation of 10.9%. The corrosion current density and polarization resistance of composites were 1.35 × 10−6A/cm2 and 1.83 × 104 Ω cm2, respectively. In 3.5 wt% NaCl solution at room temperature (25 ℃), there are pitting corrosion and intergranular corrosion on AA7075 aluminum alloy side of the amorphous layer. However, on 316L stainless steel side, no obvious corrosion occurs. The corrosion reaction is predominantly triggered by the synergistic effects of the high corrosion driving force induced by the significant potential difference between AA7075 aluminum alloy and 316L stainless steel, and micro-galvanic corrosion initiated by second-phase particles (MgZn₂, Al₇Cu₂Fe) in the matrix of AA7075 aluminum alloy.

Graphical Abstract