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<p>The effect of Mg/Si mass ratio on the microstructure and mechanical properties of Al-Mg-Si cast aluminum alloys under sub-rapid solidification conditions was investigated. This study utilized four different Mg/Si ratios: 2.83, 1.91, 1.73, and 1.53. To analyze the evolution of the microstructure, particularly the second phase, various techniques were employed: optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and electron backscatter diffraction (EBSD). Additionally, thermodynamic calculations were performed using the Thermal-calc software to further understand the microstructural changes. Results show that as the Mg/Si ratio decreases from 2.83 to 1.53, α-Al grains become more uniformly distributed. Meanwhile, the morphology of the Mg<sub>2</sub>Si phases changes from skeletal to short stick shapes with a decreasing aspect ratio. An as-cast Al-Mg-Si alloy with a Mg/Si ratio of 1.53 exhibits high strength, achieving an ultimate tensile strength (UTS) of 320.6 MPa and a yield strength (YS) of 249.9 MPa. The cast alloy with a Mg/Si ratio of 2.83 exhibits the highest elongation, reaching 5.31%. This superior elongation is attributed to the uniform distribution of Mg<sub>2</sub>Si phases, which possess a long skeletal shape. Conversely, the alloy with a Mg/Si ratio of 1.53 demonstrates the lowest elongation, primarily due to the central concentration of Mg<sub>2</sub>Si phases, which are characterized by their short stick shapes.</p>

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Effect of Mg/Si mass ratio on microstructure and mechanical properties of Al-Mg-Si cast aluminum alloy

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Jia-yan Chen,
  • Ce Zheng,
  • Cheng Zhu,
  • Ying-ju Li,
  • Tian-jiao Luo,
  • Cui-rong Liu,
  • Shao-qiang Xu,
  • Yuan-sheng Yang

摘要

The effect of Mg/Si mass ratio on the microstructure and mechanical properties of Al-Mg-Si cast aluminum alloys under sub-rapid solidification conditions was investigated. This study utilized four different Mg/Si ratios: 2.83, 1.91, 1.73, and 1.53. To analyze the evolution of the microstructure, particularly the second phase, various techniques were employed: optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and electron backscatter diffraction (EBSD). Additionally, thermodynamic calculations were performed using the Thermal-calc software to further understand the microstructural changes. Results show that as the Mg/Si ratio decreases from 2.83 to 1.53, α-Al grains become more uniformly distributed. Meanwhile, the morphology of the Mg2Si phases changes from skeletal to short stick shapes with a decreasing aspect ratio. An as-cast Al-Mg-Si alloy with a Mg/Si ratio of 1.53 exhibits high strength, achieving an ultimate tensile strength (UTS) of 320.6 MPa and a yield strength (YS) of 249.9 MPa. The cast alloy with a Mg/Si ratio of 2.83 exhibits the highest elongation, reaching 5.31%. This superior elongation is attributed to the uniform distribution of Mg2Si phases, which possess a long skeletal shape. Conversely, the alloy with a Mg/Si ratio of 1.53 demonstrates the lowest elongation, primarily due to the central concentration of Mg2Si phases, which are characterized by their short stick shapes.