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<p>The effect of the solution treatment temperature on the microstructure and properties of ZK60 magnesium alloy was investigated using optical microscopy (OM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), a tensile testing machine, scanning electron microscopy (SEM), and a microhardness tester. For ZK60 magnesium alloy sheets subjected to solution and aging heat treatment, the grains were refined, and a large number of fine second phases precipitated. Silicon (Si) further promoted the precipitation of second phases, enhancing the material’s strength and hardness. The solution and aging heat treatment also softened the material’s texture intensity, leading to a more homogeneous microstructure. This accounted for one of the main reasons why the material’s macroscopic properties were significantly enhanced by the heat treatment. After solution treatment at 350&#xa0;°C for 0.5&#xa0;h followed by aging at 180&#xa0;°C for 16&#xa0;h, the tensile strength increases to 312&#xa0;MPa, the yield strength increases to 258&#xa0;MPa, and the elongation reaches 11.0%. The number of dimples on the fracture surface increases, indicating a significant improvement in material toughness and plasticity. The optimal hardness value of 100 HV is achieved after solution treatment at 450&#xa0;°C for 0.5&#xa0;h, followed by aging at 180&#xa0;°C for 16&#xa0;h.</p>

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Optimization of Solution Treatment Temperature for Enhanced Microstructure and Mechanical Properties of ZK60 Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Qiuhui Li

摘要

The effect of the solution treatment temperature on the microstructure and properties of ZK60 magnesium alloy was investigated using optical microscopy (OM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), a tensile testing machine, scanning electron microscopy (SEM), and a microhardness tester. For ZK60 magnesium alloy sheets subjected to solution and aging heat treatment, the grains were refined, and a large number of fine second phases precipitated. Silicon (Si) further promoted the precipitation of second phases, enhancing the material’s strength and hardness. The solution and aging heat treatment also softened the material’s texture intensity, leading to a more homogeneous microstructure. This accounted for one of the main reasons why the material’s macroscopic properties were significantly enhanced by the heat treatment. After solution treatment at 350 °C for 0.5 h followed by aging at 180 °C for 16 h, the tensile strength increases to 312 MPa, the yield strength increases to 258 MPa, and the elongation reaches 11.0%. The number of dimples on the fracture surface increases, indicating a significant improvement in material toughness and plasticity. The optimal hardness value of 100 HV is achieved after solution treatment at 450 °C for 0.5 h, followed by aging at 180 °C for 16 h.