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<p>This paper investigated the influence of aging time around peak aging on precipitation behavior evolution and corresponding property variations in Al-Zn-Mg-Cu alloy. The results showed that there was a wide time interval with high hardness for the solution-treated samples after aging at 120&#xa0;°C. The hardness of the samples aged for 10 hours was close to that of the peak-aging samples. After 18 hours aging treatment, the samples reached the peak hardness. The main strengthening phases of the samples were dispersed GP zone and η′ phases, and the tensile strength of the samples reached 599&#xa0;MPa. The hardness of the 26-hours-aged samples decreased slightly. The main strengthening phases of the three aging-treated samples were η′ phase, and the fracture mechanisms of all samples were mixed ductile and brittle fracture mechanisms. The aging time affected the width of the precipitate-free zones (PFZ) and the distribution of grain boundary precipitates (GBPs). With the prolongation of aging time, the width of the PFZ increased and the GBPs coarsened. The 18-hours-aged samples showed the best corrosion resistance. The 26-hours-aged samples had the worst corrosion resistance, and the wide PFZ and coarsened continuous GBPs had a negative effect on the corrosion resistance of the alloy.</p>

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Effect of Aging Time on Mechanical and Corrosion Properties of Al-Zn-Mg-Cu Alloys

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Qinghua Zhang,
  • Fuqiang Guo,
  • Tianyou Zou,
  • Haoze Song,
  • Tao Wang,
  • Yong Zou

摘要

This paper investigated the influence of aging time around peak aging on precipitation behavior evolution and corresponding property variations in Al-Zn-Mg-Cu alloy. The results showed that there was a wide time interval with high hardness for the solution-treated samples after aging at 120 °C. The hardness of the samples aged for 10 hours was close to that of the peak-aging samples. After 18 hours aging treatment, the samples reached the peak hardness. The main strengthening phases of the samples were dispersed GP zone and η′ phases, and the tensile strength of the samples reached 599 MPa. The hardness of the 26-hours-aged samples decreased slightly. The main strengthening phases of the three aging-treated samples were η′ phase, and the fracture mechanisms of all samples were mixed ductile and brittle fracture mechanisms. The aging time affected the width of the precipitate-free zones (PFZ) and the distribution of grain boundary precipitates (GBPs). With the prolongation of aging time, the width of the PFZ increased and the GBPs coarsened. The 18-hours-aged samples showed the best corrosion resistance. The 26-hours-aged samples had the worst corrosion resistance, and the wide PFZ and coarsened continuous GBPs had a negative effect on the corrosion resistance of the alloy.