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<p>In this study, the effects of Cu and Zn addition on the microstructure, mechanical properties, and intergranular corrosion (IGC) resistance of Al-5.5Mg alloys are examined. With increasing Cu addition in as-cast alloy, the primary phases change from lamellar T-Al<sub>6</sub>Mg<sub>4</sub>Cu phase to blocky S-Al<sub>2</sub>CuMg and T-Al<sub>6</sub>Mg<sub>4</sub>Cu phases, which are reticulately distributed alongside grain boundaries. The lump T-Mg<sub>32</sub>(Al, Zn)<sub>49</sub> phase is formed by introducing Zn. In Cu-containing alloys, the mechanical properties are optimal for the alloy with 1.5 wt% Cu, with a yield strength (YS) of 348&#xa0;MPa, an ultimate tensile strength (UTS) of 452&#xa0;MPa, and an elongation (EL) of 12.4%, due to the synergistic strengthening effect of the S phase, dislocation, and solid solution. The alloy with 3 wt% Zn exhibits the highest level of tensile properties, with a YS of 441&#xa0;MPa, an UTS of 508&#xa0;MPa, and an EL of 10.9%. This is attributed to the higher number density and finer dispersion of the spherical T phase, which effectively impedes the movement of dislocations. For corrosion properties, all Cu-containing alloys exhibit significant IGC susceptibility, while the IGC resistance of Zn-containing alloys increase with Zn content. The alloy containing 3 wt% Zn demonstrates uniform corrosion and exhibits excellent IGC resistance, with a maximum corrosion depth of 68.1&#xa0;μm.</p>

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A Comparative Investigation of Microstructure and Intergranular Corrosion Behavior of Al-5.5Mg Alloys with Equivalent Additions of Cu and Zn

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Qirong Wei,
  • Xiaoqian Li,
  • Chongchong Li,
  • Hongxuan Wang,
  • Yanchao Deng,
  • Bin Wang

摘要

In this study, the effects of Cu and Zn addition on the microstructure, mechanical properties, and intergranular corrosion (IGC) resistance of Al-5.5Mg alloys are examined. With increasing Cu addition in as-cast alloy, the primary phases change from lamellar T-Al6Mg4Cu phase to blocky S-Al2CuMg and T-Al6Mg4Cu phases, which are reticulately distributed alongside grain boundaries. The lump T-Mg32(Al, Zn)49 phase is formed by introducing Zn. In Cu-containing alloys, the mechanical properties are optimal for the alloy with 1.5 wt% Cu, with a yield strength (YS) of 348 MPa, an ultimate tensile strength (UTS) of 452 MPa, and an elongation (EL) of 12.4%, due to the synergistic strengthening effect of the S phase, dislocation, and solid solution. The alloy with 3 wt% Zn exhibits the highest level of tensile properties, with a YS of 441 MPa, an UTS of 508 MPa, and an EL of 10.9%. This is attributed to the higher number density and finer dispersion of the spherical T phase, which effectively impedes the movement of dislocations. For corrosion properties, all Cu-containing alloys exhibit significant IGC susceptibility, while the IGC resistance of Zn-containing alloys increase with Zn content. The alloy containing 3 wt% Zn demonstrates uniform corrosion and exhibits excellent IGC resistance, with a maximum corrosion depth of 68.1 μm.