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<p>The effects of homogenization temperature and time on the microstructure of eutectic silicon in quenched cast A357 aluminum alloy, as well as the influence of solution temperature on its mechanical properties after artificial aging, were investigated. The results show that a synergistic optimization of homogenization, solution temperature and time improves the mechanical properties of the alloy greatly through optimization its microstructure with fine and spheroidized eutectic silicon and <i>β</i>″ precipitates with high number density. During homogenization, the eutectic silicon undergoes progressive spheroidization process with the holding time, during which the length of the eutectic silicon decreases while its width increases. It can be accelerated significantly through elevating the temperatures and will improves the material ductility greatly. Increasing the homogenization time propels the spheroidization of eutectic silicon but will also cause it to turn irregular with larger particle sizes and even transform into an amorphous state if the time is excessively prolonged due to irregular overgrowth. Elevating the solid solution temperature also produces vacancy with much higher concentration in the achieved supper-saturated solid solution after quenching, which will promote precipitation of the <i>β</i>″ strengthening phase during thereafter artificial aging but remains its sizes un-changed. Thereby, the precipitation strengthening potential of the alloy is utmost improved. A recommended heat treatment for the cast A357 aluminum alloy is simultaneous homogenization and solid solution at 535&#xa0;°C for 12&#xa0;h followed by room-temperature water quenching, and then artificial aging at 160&#xa0;°C for 4–8&#xa0;h.</p>

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Influence of Homogenization Temperature and Time on the Microstructure and Mechanical Properties of Cast A357 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Sinian Wan,
  • Tan Wang,
  • Xinghao Gao,
  • Lin Tang,
  • Ke Li,
  • Ruiqing Lu,
  • Zhichao Deng,
  • Fulin Jiang,
  • Hong He

摘要

The effects of homogenization temperature and time on the microstructure of eutectic silicon in quenched cast A357 aluminum alloy, as well as the influence of solution temperature on its mechanical properties after artificial aging, were investigated. The results show that a synergistic optimization of homogenization, solution temperature and time improves the mechanical properties of the alloy greatly through optimization its microstructure with fine and spheroidized eutectic silicon and β″ precipitates with high number density. During homogenization, the eutectic silicon undergoes progressive spheroidization process with the holding time, during which the length of the eutectic silicon decreases while its width increases. It can be accelerated significantly through elevating the temperatures and will improves the material ductility greatly. Increasing the homogenization time propels the spheroidization of eutectic silicon but will also cause it to turn irregular with larger particle sizes and even transform into an amorphous state if the time is excessively prolonged due to irregular overgrowth. Elevating the solid solution temperature also produces vacancy with much higher concentration in the achieved supper-saturated solid solution after quenching, which will promote precipitation of the β″ strengthening phase during thereafter artificial aging but remains its sizes un-changed. Thereby, the precipitation strengthening potential of the alloy is utmost improved. A recommended heat treatment for the cast A357 aluminum alloy is simultaneous homogenization and solid solution at 535 °C for 12 h followed by room-temperature water quenching, and then artificial aging at 160 °C for 4–8 h.