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<p>The influence of Er on the microstructure evolution and intergranular corrosion (IGC) behavior of a novel Al–Mg–Er alloy joint fabricated by metal inert gas welding (MIG) and laser welding (LW) was investigated. Results showed that the laser welded joint has a better overall corrosion resistance, with an average mass loss of 12.278&#xa0;mg/cm<sup>2</sup>, compared to 15.157&#xa0;mg/cm<sup>2</sup> for the MIG-welded joint. The better corrosion resistance of the laser welded joint can be attributed to its lower heat input and faster cooling rate, which result in an effective suppression of the continuous precipitated β-Al<sub>3</sub>Mg<sub>2</sub> phase in welded metal (WM) and heat affected zone (HAZ). It is noteworthy that despite the overall superior corrosion resistance of laser welded joint, the fine equiaxed zone (FQZ) within the laser welded joint exhibited a poor corrosion resistance, primarily due to the role of Er in promoting heterogeneous nucleation via Er-containing precipitates during solidification. In the meantime, the L1<sub>2</sub>-structed Al<sub>3</sub>(Er, Zr) particles can impede the movement of grain boundary, slowing down the rate of dendrite growth, resulting in the formation of fine grains near the fusion line. The smaller grain size, and the extensive precipitation of β phase due to the increased number of high-angle grain boundaries (HAGBs) in the FQZ, result in a more pronounced susceptibility to corrosion.</p>

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Microstructure and intergranular corrosion behavior of Al–Mg–Er alloy joints fabricated by metal inert gas and laser welding

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Leyi Fu,
  • Xiaojian Xu,
  • Yaqi Wang,
  • Jiangyue Han,
  • Haichao Cui,
  • Fenggui Lu

摘要

The influence of Er on the microstructure evolution and intergranular corrosion (IGC) behavior of a novel Al–Mg–Er alloy joint fabricated by metal inert gas welding (MIG) and laser welding (LW) was investigated. Results showed that the laser welded joint has a better overall corrosion resistance, with an average mass loss of 12.278 mg/cm2, compared to 15.157 mg/cm2 for the MIG-welded joint. The better corrosion resistance of the laser welded joint can be attributed to its lower heat input and faster cooling rate, which result in an effective suppression of the continuous precipitated β-Al3Mg2 phase in welded metal (WM) and heat affected zone (HAZ). It is noteworthy that despite the overall superior corrosion resistance of laser welded joint, the fine equiaxed zone (FQZ) within the laser welded joint exhibited a poor corrosion resistance, primarily due to the role of Er in promoting heterogeneous nucleation via Er-containing precipitates during solidification. In the meantime, the L12-structed Al3(Er, Zr) particles can impede the movement of grain boundary, slowing down the rate of dendrite growth, resulting in the formation of fine grains near the fusion line. The smaller grain size, and the extensive precipitation of β phase due to the increased number of high-angle grain boundaries (HAGBs) in the FQZ, result in a more pronounced susceptibility to corrosion.