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<p>The effect of peripheral coarse grain (PCG) thickness on intergranular corrosion (IGC) behavior and mechanical properties of Al-Mg-Si alloys with high Mn/Cr and low Mn (no Cr) was investigated. In high Mn/Cr alloy, IGC resistance is optimal when PCG is below 80&#xa0;μm. Complete removal of PCG results in a transition from intergranular corrosion to exfoliation corrosion, accompanied by the shedding of fine grains. Mechanical properties exhibit minor fluctuations of less than 5% with varying PCG thickness. By controlling PCG thickness below 80&#xa0;μm, high Mn/Cr alloy achieves comprehensive properties including a tensile strength of 444&#xa0;MPa, yield strength of 419&#xa0;MPa, and maximum intergranular corrosion depth of 112&#xa0;μm. In contrast, the low-Mn alloy shows low corrosion resistance because of extensive recrystallization, and the maximum intergranular corrosion depth of the alloys at different PCG thicknesses exceeds 300&#xa0;μm. Similar to high Mn/Cr alloy, PCG thickness has little effect on mechanical properties of low-Mn alloy, with a maximum tensile strength of 324&#xa0;MPa and a maximum yield strength of 301&#xa0;MPa.</p>

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Intergranular Corrosion Behavior and Mechanical Properties of Al-Mg-Si Alloy Profiles: The Effect of Peripheral Coarse Grain Thickness

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Zhixin Feng,
  • Zibin Wu,
  • Dongtao Wang,
  • Hiromi Nagaumi,
  • Yifeng Li,
  • Wanjie Chen,
  • Fuan Hua,
  • Minghe Zhang,
  • Haitao Zhang,
  • Bo Zhang

摘要

The effect of peripheral coarse grain (PCG) thickness on intergranular corrosion (IGC) behavior and mechanical properties of Al-Mg-Si alloys with high Mn/Cr and low Mn (no Cr) was investigated. In high Mn/Cr alloy, IGC resistance is optimal when PCG is below 80 μm. Complete removal of PCG results in a transition from intergranular corrosion to exfoliation corrosion, accompanied by the shedding of fine grains. Mechanical properties exhibit minor fluctuations of less than 5% with varying PCG thickness. By controlling PCG thickness below 80 μm, high Mn/Cr alloy achieves comprehensive properties including a tensile strength of 444 MPa, yield strength of 419 MPa, and maximum intergranular corrosion depth of 112 μm. In contrast, the low-Mn alloy shows low corrosion resistance because of extensive recrystallization, and the maximum intergranular corrosion depth of the alloys at different PCG thicknesses exceeds 300 μm. Similar to high Mn/Cr alloy, PCG thickness has little effect on mechanical properties of low-Mn alloy, with a maximum tensile strength of 324 MPa and a maximum yield strength of 301 MPa.