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<p>This paper analyzed the effects of heat treatment on microstructure and properties of ADC12 alloy containing Mo, Sr, and Al-5Ti-B by comparing the as-cast and heat-treated alloys. Results demonstrate that the alloy with Al-5Ti-1B has the most significant effect on grain refinement, while the alloy containing Sr has the best modification effect on eutectic Si phase. The eutectic Si phase size decreases significantly, and the shape factor of as-cast and heat-treated alloys increases to 0.83 and 0.85, respectively, which helps to enhance the overall properties of the alloy. Mo promotes the transformation of the Fe-rich phase into the AlFeMoSi dispersed phase and weakens its fragmentation effect on the matrix. The hardness of the heat-treated alloys increased 45.3 ~ 69%, with the alloys containing Al-5Ti-1B and Sr showing the most noticeable improvement. The melting and spheroidization of eutectic Si after heat treatment help to enhance the conductivity of alloy. Specifically, the conductivity of heat-treated alloys is more than 10% higher than that of as-cast alloys. After heat treatment and addition of varied compositions, ADC12 alloys have a low friction coefficient and wear rate, especially the alloy with Sr, which shows excellent wear resistance due to its fine and evenly distributed eutectic Si phase, and the friction coefficient is 0.47.</p>

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Study about Heat Treatment on Microstructure and Properties of ADC12 Alloy with Varied Compositions

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Xiangjie Wang,
  • Zhenyu Wu,
  • Lumin Gou,
  • DongMei Tian,
  • Changke Chen,
  • Guozhong He,
  • Zhaoxi Song,
  • Chengcheng Chen,
  • Jianzhong Cui

摘要

This paper analyzed the effects of heat treatment on microstructure and properties of ADC12 alloy containing Mo, Sr, and Al-5Ti-B by comparing the as-cast and heat-treated alloys. Results demonstrate that the alloy with Al-5Ti-1B has the most significant effect on grain refinement, while the alloy containing Sr has the best modification effect on eutectic Si phase. The eutectic Si phase size decreases significantly, and the shape factor of as-cast and heat-treated alloys increases to 0.83 and 0.85, respectively, which helps to enhance the overall properties of the alloy. Mo promotes the transformation of the Fe-rich phase into the AlFeMoSi dispersed phase and weakens its fragmentation effect on the matrix. The hardness of the heat-treated alloys increased 45.3 ~ 69%, with the alloys containing Al-5Ti-1B and Sr showing the most noticeable improvement. The melting and spheroidization of eutectic Si after heat treatment help to enhance the conductivity of alloy. Specifically, the conductivity of heat-treated alloys is more than 10% higher than that of as-cast alloys. After heat treatment and addition of varied compositions, ADC12 alloys have a low friction coefficient and wear rate, especially the alloy with Sr, which shows excellent wear resistance due to its fine and evenly distributed eutectic Si phase, and the friction coefficient is 0.47.