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<p>As a heat treatable strengthening alloy, the AlSi10MnMg aluminum alloy is commonly used in the production of load-bearing components in the automotive industry by the high-pressure die-casting (HPDC) process. However, it is usually difficult to determine the appropriate heat treatment process parameters for die-cast AlSi10MnMg aluminum alloy. This paper investigates the influence of T6 heat treatment on the microstructure and mechanical properties of vacuum die-cast AlSi10MnMg aluminum alloy and explores the optimal heat treatment process parameters through orthogonal experiments. Results demonstrate that a brief solid solution treatment at a low temperature can alter the morphology of eutectic silicon. The rate of necking, spheroidization, and coarsening of the silicon phase accelerates with increasing solid solution temperature. However, the coarsening rate gradually slows down with prolonged solid solution time. After aging treatment, a significant number of short rodlike and granular precipitates are distributed within the aluminum matrix, leading to a significant enhancement in strength of the alloy. Extreme difference analysis results of orthogonal experiments indicate that the order of influence on the strength-toughness index of the specimen is as follows: aging temperature &gt; solid solution temperature &gt; aging time &gt; solid solution time. The optimal T6 heat treatment process parameters for specimens are determined to be a solid solution treatment at 480&#xa0;°C for 1&#xa0;h and then an aging treatment at 180&#xa0;°C for 12&#xa0;h, while the ultimate tensile strength, yield strength, and elongation of die-cast AlSi10MnMg aluminum alloy are 303.7 ± 5.2&#xa0;MPa, 246.4 ± 5.4&#xa0;MPa, and 7.4 ± 1.3%, respectively.</p>

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Optimization of T6 Heat Treatment Process Parameters for Vacuum Die-Cast AlSi10MnMg Aluminum Alloy by Orthogonal Experiments

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Jun-wei Guo,
  • Zong-bin Huang,
  • Shou-mei Xiong,
  • Meng-wu Wu,
  • Tie Xu

摘要

As a heat treatable strengthening alloy, the AlSi10MnMg aluminum alloy is commonly used in the production of load-bearing components in the automotive industry by the high-pressure die-casting (HPDC) process. However, it is usually difficult to determine the appropriate heat treatment process parameters for die-cast AlSi10MnMg aluminum alloy. This paper investigates the influence of T6 heat treatment on the microstructure and mechanical properties of vacuum die-cast AlSi10MnMg aluminum alloy and explores the optimal heat treatment process parameters through orthogonal experiments. Results demonstrate that a brief solid solution treatment at a low temperature can alter the morphology of eutectic silicon. The rate of necking, spheroidization, and coarsening of the silicon phase accelerates with increasing solid solution temperature. However, the coarsening rate gradually slows down with prolonged solid solution time. After aging treatment, a significant number of short rodlike and granular precipitates are distributed within the aluminum matrix, leading to a significant enhancement in strength of the alloy. Extreme difference analysis results of orthogonal experiments indicate that the order of influence on the strength-toughness index of the specimen is as follows: aging temperature > solid solution temperature > aging time > solid solution time. The optimal T6 heat treatment process parameters for specimens are determined to be a solid solution treatment at 480 °C for 1 h and then an aging treatment at 180 °C for 12 h, while the ultimate tensile strength, yield strength, and elongation of die-cast AlSi10MnMg aluminum alloy are 303.7 ± 5.2 MPa, 246.4 ± 5.4 MPa, and 7.4 ± 1.3%, respectively.