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<p>The effects of quench sensitivity on the mechanical properties and corrosion resistance of AA7046 aluminum alloy&#xa0;were investigated using hardness and tensile tests, immersion corrosion, and intergranular corrosion (IGC) tests, combined with scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), electron backscatter diffraction (EBSD), high-resolution transmission electron microscopy (HRTEM), and scanning Kelvin probe force microscopy (SKPFM). As the quench rate decreased from 422.7 to 4.7&#xa0;℃/s, the tensile strength (TS) and yield strength (YS) decreased by 13.6 and 14.1%, respectively, and the elongation decreased by 54.8%. The reduced quench rate also deteriorated corrosion resistance, evidenced by an increase in maximum IGC depth from 36 to 55&#xa0;μm. This deterioration is accompanied by coarsening of the η phase at GBs (from 11 to 45&#xa0;nm), widening of the precipitate-free zone (PFZ) (from 12 to 62&#xa0;nm), and significant enrichment of Zn and Mg at grain boundaries (GBs) (increasing from 5.0%/1.6% to 52.9%/5.1%, respectively). Density functional theory (DFT) calculations reveal that the surface work function of the anodic η phase is 3.837&#xa0;eV, lower than that of the Al matrix (4.092&#xa0;eV). During corrosion, this phase acts as an anode, facilitating the formation of corrosion pathways and thereby exacerbating intergranular corrosion.</p>

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Quench Sensitivity Study of Mechanical Properties and Corrosion Resistance in AA7046 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Dingyao Fu,
  • Chengbo Li,
  • Canwei Zhang,
  • Siqi Zhou,
  • Xuejun Zheng,
  • Qinyao Chen,
  • Puli Cao,
  • Wang Zhou,
  • Wengang Chen,
  • Mingqiang Luo,
  • Xikun Wu

摘要

The effects of quench sensitivity on the mechanical properties and corrosion resistance of AA7046 aluminum alloy were investigated using hardness and tensile tests, immersion corrosion, and intergranular corrosion (IGC) tests, combined with scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), electron backscatter diffraction (EBSD), high-resolution transmission electron microscopy (HRTEM), and scanning Kelvin probe force microscopy (SKPFM). As the quench rate decreased from 422.7 to 4.7 ℃/s, the tensile strength (TS) and yield strength (YS) decreased by 13.6 and 14.1%, respectively, and the elongation decreased by 54.8%. The reduced quench rate also deteriorated corrosion resistance, evidenced by an increase in maximum IGC depth from 36 to 55 μm. This deterioration is accompanied by coarsening of the η phase at GBs (from 11 to 45 nm), widening of the precipitate-free zone (PFZ) (from 12 to 62 nm), and significant enrichment of Zn and Mg at grain boundaries (GBs) (increasing from 5.0%/1.6% to 52.9%/5.1%, respectively). Density functional theory (DFT) calculations reveal that the surface work function of the anodic η phase is 3.837 eV, lower than that of the Al matrix (4.092 eV). During corrosion, this phase acts as an anode, facilitating the formation of corrosion pathways and thereby exacerbating intergranular corrosion.