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<p>In this work, the effects of an initial aging treatment on the microscopic precipitation behavior of the heat-affected zone (HAZ) of the 7085 alloy joints were examined, and the fracture mechanism and corrosion mechanism of the welded joints were further investigated. The mechanical property experiments revealed that the tensile fracture position and the lowest hardness point of the friction stir welding (FSW) joints under different aging states were located in the HAZ. The corrosion tests revealed that under the action of the macroscopic galvanic effect, the intergranular corrosion (IGC) degree was the deepest in the HAZ region, the E<sub>corr</sub> was the lowest, and severe spalling behavior occurred. For the T6 alloy joint, the strengthening phase in the HAZ was mainly the η’ phase; here, the dislocations moved by a shear mechanism, and high mechanical properties were attained. The formation of micro-galvanic corrosion cells between the approximately continuously distributed grain boundary precipitates (GBPs) and the precipitate-free zone (PFZ) resulted in poor corrosion resistance. For the T74 alloy joint, the MPTs in the HAZ were in the coarse η phase, which induced dislocation movement via a bypass mechanism and caused poor mechanical properties. The discontinuous distribution of GBPs hindered the formation of corrosion channels such that the corrosion resistance was improved.</p>

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Effect of Initial Aging on the Precipitation and Corrosion Behavior in the Heat-Affected Zone of 7085 Alloy Friction Stir Welded Joints

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Jianan Yang,
  • Zhiqiang Ru,
  • Ming Liu,
  • Zhimin Pi,
  • Lili Wei,
  • Hongfeng Huang,
  • Shuhui Liu,
  • Degui Li

摘要

In this work, the effects of an initial aging treatment on the microscopic precipitation behavior of the heat-affected zone (HAZ) of the 7085 alloy joints were examined, and the fracture mechanism and corrosion mechanism of the welded joints were further investigated. The mechanical property experiments revealed that the tensile fracture position and the lowest hardness point of the friction stir welding (FSW) joints under different aging states were located in the HAZ. The corrosion tests revealed that under the action of the macroscopic galvanic effect, the intergranular corrosion (IGC) degree was the deepest in the HAZ region, the Ecorr was the lowest, and severe spalling behavior occurred. For the T6 alloy joint, the strengthening phase in the HAZ was mainly the η’ phase; here, the dislocations moved by a shear mechanism, and high mechanical properties were attained. The formation of micro-galvanic corrosion cells between the approximately continuously distributed grain boundary precipitates (GBPs) and the precipitate-free zone (PFZ) resulted in poor corrosion resistance. For the T74 alloy joint, the MPTs in the HAZ were in the coarse η phase, which induced dislocation movement via a bypass mechanism and caused poor mechanical properties. The discontinuous distribution of GBPs hindered the formation of corrosion channels such that the corrosion resistance was improved.