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<p>Particle-reinforced aluminum matrix composites (PRAMCs) are considered as a potential new generation of structural materials that can replace steel. Most of the traditional aerospace friction structural parts are steel, which is not conducive to weight reduction. Lightweight is possible with PRMACs. In this work, three PRMMCs were prepared by laser additive manufacturing (LAM): 7075 alloy + 1%Ti powder + 5%B<sub>4</sub>C: C1; 7075 alloy + 1%Ti powder + 10%B<sub>4</sub>C: C2; and 7075 alloy + 1%Ti powder + 15%B<sub>4</sub>C: C3. Their microstructure and wear properties were characterized. The results show that C3 has the smallest grain size and the best wear resistance because B4C particles help to resist frictional stress and reduce wear rates. The wear mechanism changes from adhesive wear and abrasive wear to oxidation wear with the increased load and sliding speed, significantly reducing the wear rate. Relations between wear rate, B4C content, load and sliding distance are established. These findings provide detailed insights into the relationship between PRAMCs' wear behavior and various parameters. It provides a predictive framework for understanding the friction and wear behavior of specific aluminum matrix composites. The aluminum matrix composites designed in this paper can break the limitation of low density and high performance of traditional wear-resistant structural materials. It opens up a new way for the further development of wear-resistant materials.</p>

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Wear behavior of B4C particle-reinforced aluminum matrix composites based on laser additive manufacturing

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Yin Wang,
  • Yong Li,
  • Haiyao Wang,
  • Wei Yu,
  • Chen He,
  • Guangming Xu,
  • Jiadong Li,
  • Hongqun Tang

摘要

Particle-reinforced aluminum matrix composites (PRAMCs) are considered as a potential new generation of structural materials that can replace steel. Most of the traditional aerospace friction structural parts are steel, which is not conducive to weight reduction. Lightweight is possible with PRMACs. In this work, three PRMMCs were prepared by laser additive manufacturing (LAM): 7075 alloy + 1%Ti powder + 5%B4C: C1; 7075 alloy + 1%Ti powder + 10%B4C: C2; and 7075 alloy + 1%Ti powder + 15%B4C: C3. Their microstructure and wear properties were characterized. The results show that C3 has the smallest grain size and the best wear resistance because B4C particles help to resist frictional stress and reduce wear rates. The wear mechanism changes from adhesive wear and abrasive wear to oxidation wear with the increased load and sliding speed, significantly reducing the wear rate. Relations between wear rate, B4C content, load and sliding distance are established. These findings provide detailed insights into the relationship between PRAMCs' wear behavior and various parameters. It provides a predictive framework for understanding the friction and wear behavior of specific aluminum matrix composites. The aluminum matrix composites designed in this paper can break the limitation of low density and high performance of traditional wear-resistant structural materials. It opens up a new way for the further development of wear-resistant materials.