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<p>This study investigates the effects of pulsed magnetic field aging treatment on precipitate evolution and mechanical properties of the solidified microstructure in the ZL114A-RE aluminum alloy, and optimizes the corresponding aging parameters. The alloy used is ZL114A modified with 0.25 wt.% Ce–La mixed rare earths. It was first solution-treated at 530°C for 8&#xa0;h under a PMF, and subsequently aged under a pulsed magnetic field at different temperatures (155°C, 165°C, and 175°C) for varying durations (4&#xa0;h, 6&#xa0;h, and 8&#xa0;h). The microstructural evolution and property changes were systematically analyzed by OM, SEM, EDS, XRD, TEM, and mechanical testing. The results show that pulsed magnetic field aging significantly spheroidizes and refines eutectic silicon, improves precipitate distribution, and accelerates the precipitation of strengthening phases. Optimal comprehensive mechanical properties are achieved after pulsed magnetic field aging at 165°C for 6&#xa0;h: hardness of 120 HV, tensile strength of 358&#xa0;MPa, and elongation of 9.0%, corresponding to increases of 5.3%, 9.8%, and 20%, respectively, over conventional aging. Compared with the conventional heat-treatment process used in relevant industrial practice, the tensile strength increases by 4.4%, elongation by 38.5%, and the total process time is reduced by 22.2%.</p>

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The Effect of Pulsed Magnetic Field Aging on the Microstructural Evolution and Mechanical Properties of ZL114A-RE Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Long Zhao,
  • Bingtao Han,
  • Ruiqing Lang,
  • Tingwei Bai,
  • Tao Li,
  • Shuqing Xing,
  • Yonglin Ma

摘要

This study investigates the effects of pulsed magnetic field aging treatment on precipitate evolution and mechanical properties of the solidified microstructure in the ZL114A-RE aluminum alloy, and optimizes the corresponding aging parameters. The alloy used is ZL114A modified with 0.25 wt.% Ce–La mixed rare earths. It was first solution-treated at 530°C for 8 h under a PMF, and subsequently aged under a pulsed magnetic field at different temperatures (155°C, 165°C, and 175°C) for varying durations (4 h, 6 h, and 8 h). The microstructural evolution and property changes were systematically analyzed by OM, SEM, EDS, XRD, TEM, and mechanical testing. The results show that pulsed magnetic field aging significantly spheroidizes and refines eutectic silicon, improves precipitate distribution, and accelerates the precipitation of strengthening phases. Optimal comprehensive mechanical properties are achieved after pulsed magnetic field aging at 165°C for 6 h: hardness of 120 HV, tensile strength of 358 MPa, and elongation of 9.0%, corresponding to increases of 5.3%, 9.8%, and 20%, respectively, over conventional aging. Compared with the conventional heat-treatment process used in relevant industrial practice, the tensile strength increases by 4.4%, elongation by 38.5%, and the total process time is reduced by 22.2%.