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<p>This study systematically investigated the effects of different solution temperatures (470, 500, 530 °C) on the microstructure, mechanical properties, and corrosion behaviour of an Al-1.5Mg-1Si-0.6Mn-1.2Zn alloy in the T4 state. The results demonstrate that the solution temperature exerts a significant influence on the dissolution behaviour of the secondary phases, Mg<sub>2</sub>Si and Al(Fe,Mn)Si. At a solution temperature of 470&#xa0;°C, large black Mg<sub>2</sub>Si phases were clearly visible under OM, and the highest yield strength (66 MPa) and tensile strength (169 MPa) were obtained. As the solution temperature increased, the tensile strength of the alloy first decreased and then increased. This is attributed to recrystallisation softening causing a strength drop at 500 °C, but recovery occurred at 530&#xa0;°C due to enhanced strengthening from sufficient Mg<sub>2</sub>Si dissolution. The corrosion resistance of the Al-1.5Mg-1Si-0.6Mn-1.2Zn alloy first increased and then decreased with increasing solution temperature. The alloy treated at 500 °C exhibited the lowest corrosion current density and the best corrosion resistance, which is attributed to the protective corrosion product film formed on the matrix.</p>

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Study on Microstructure and Properties of Al-1.5Mg-1Si-0.6Mn-1.2Zn Alloy under Different Solution Temperatures

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Ziheng Wang,
  • Fei Zhang,
  • Di Wu,
  • Hanwei Fu,
  • Ziliang Ge,
  • Lin Yang,
  • Zulai Li,
  • He Wei

摘要

This study systematically investigated the effects of different solution temperatures (470, 500, 530 °C) on the microstructure, mechanical properties, and corrosion behaviour of an Al-1.5Mg-1Si-0.6Mn-1.2Zn alloy in the T4 state. The results demonstrate that the solution temperature exerts a significant influence on the dissolution behaviour of the secondary phases, Mg2Si and Al(Fe,Mn)Si. At a solution temperature of 470 °C, large black Mg2Si phases were clearly visible under OM, and the highest yield strength (66 MPa) and tensile strength (169 MPa) were obtained. As the solution temperature increased, the tensile strength of the alloy first decreased and then increased. This is attributed to recrystallisation softening causing a strength drop at 500 °C, but recovery occurred at 530 °C due to enhanced strengthening from sufficient Mg2Si dissolution. The corrosion resistance of the Al-1.5Mg-1Si-0.6Mn-1.2Zn alloy first increased and then decreased with increasing solution temperature. The alloy treated at 500 °C exhibited the lowest corrosion current density and the best corrosion resistance, which is attributed to the protective corrosion product film formed on the matrix.