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<p>Through microstructure analysis, this study aims to explore effects of antimony (Sb) modification, solid solution, and aging treatments on the microstructure, mechanical properties, and anti-wear properties of 4Y32 (Al-11.2Si-3Cu-0.5Mg-0.5Mn) wrought aluminum alloys. The main objective is to obtain alloys with better wear resistance. The results revealed that antimony-modified alloys exhibited a fine lamellar eutectic microstructure. After homogenization, eutectic silicon underwent refinement and spheroidization. After hot rolling, the eutectic silicon exhibited more significant refinement and spheroidization, while eutectic silicon coarsened with an increase in the solid-solution treatment time. Furthermore after 505&#xa0;°C*0.5&#xa0;h solid-solution treatment and quenching, the strengthened solid-solution atoms of the alloy were completely dissolved into the Al matrix. The antimony modification did not affect the precipitation kinetic energy or precipitation amount of the alloy, but with the addition of antimony, the eutectic silicon of the T6 alloy was refined. With the antimony modification and solid-solution aging treatments, the morphology and hardness of eutectic silicon in the 4Y32 alloy were adjusted. When the hardness of the alloy was the same, the eutectic silicon became thinner and more resistant to wear. When the size of alloy eutectic silicon was the same, the higher the hardness of the alloy was, the higher its wear resistance became. Combined with the addition of antimony, reduction in the solid-solution treatment time, and T6 peak aging heat treatment, the alloy with the finest eutectic silicon and the highest hardness was obtained. Thus, the wear resistance of the 4Y32 alloy was enhanced. During the wear process, a mechanically mixed layer (MML) was formed on the alloy surface. The antimony-modified alloy exhibited higher stability, but the stability of the MML decreased with an increase in the thickness of the oxide layer. When the MML peeled off as a result of crack growth and transmission, the wear mechanism was changed from abrasive wear to delamination wear.</p>

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Effects of Trace Antimony and Heat Treatment on the Microstructures and Wear Properties of 4Y32-T6 Wrought Alloys

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Chin-Wei Hsu,
  • Wei-Hsin Chen,
  • Chen-Chieh Hsiung,
  • Mien-Chung Chen,
  • Sheng-Long Lee,
  • Yang-Chun Chiu

摘要

Through microstructure analysis, this study aims to explore effects of antimony (Sb) modification, solid solution, and aging treatments on the microstructure, mechanical properties, and anti-wear properties of 4Y32 (Al-11.2Si-3Cu-0.5Mg-0.5Mn) wrought aluminum alloys. The main objective is to obtain alloys with better wear resistance. The results revealed that antimony-modified alloys exhibited a fine lamellar eutectic microstructure. After homogenization, eutectic silicon underwent refinement and spheroidization. After hot rolling, the eutectic silicon exhibited more significant refinement and spheroidization, while eutectic silicon coarsened with an increase in the solid-solution treatment time. Furthermore after 505 °C*0.5 h solid-solution treatment and quenching, the strengthened solid-solution atoms of the alloy were completely dissolved into the Al matrix. The antimony modification did not affect the precipitation kinetic energy or precipitation amount of the alloy, but with the addition of antimony, the eutectic silicon of the T6 alloy was refined. With the antimony modification and solid-solution aging treatments, the morphology and hardness of eutectic silicon in the 4Y32 alloy were adjusted. When the hardness of the alloy was the same, the eutectic silicon became thinner and more resistant to wear. When the size of alloy eutectic silicon was the same, the higher the hardness of the alloy was, the higher its wear resistance became. Combined with the addition of antimony, reduction in the solid-solution treatment time, and T6 peak aging heat treatment, the alloy with the finest eutectic silicon and the highest hardness was obtained. Thus, the wear resistance of the 4Y32 alloy was enhanced. During the wear process, a mechanically mixed layer (MML) was formed on the alloy surface. The antimony-modified alloy exhibited higher stability, but the stability of the MML decreased with an increase in the thickness of the oxide layer. When the MML peeled off as a result of crack growth and transmission, the wear mechanism was changed from abrasive wear to delamination wear.