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<p>In this paper, three aluminum matrix composites (7075 alloy + 1%Ti powder: A1, 7075 alloy + 5%B<sub>4</sub>C: A2, and 7075 alloy + 1%Ti powder + 5%B<sub>4</sub>C: A3) were prepared by laser additive manufacturing (LAM) technology. Their microstructure and properties were characterized by scanning electron microscopy, X-ray diffractometer, tensile testing, and wear testing. The results showed that A3 has the best tensile properties, hardness, and wear resistance due to their fine grains and good interfacial bonding strength of matrix and reinforcement. The wear mechanism of A3 changes from adhesive wear and oxidation wear to oxidative wear and bond delamination wear with increased load and sliding speed. The wear rate and friction coefficient of A3 increase with increased load and sliding speed.</p>

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Tribological behavior and mechanism of B4C/Al3Ti particles-reinforced Al–Zn–Mg–Cu composites prepared by laser direct energy deposition

  • 期刊论文

  • 发表日期：

    2025年10月20日

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

摘要

In this paper, three aluminum matrix composites (7075 alloy + 1%Ti powder: A1, 7075 alloy + 5%B4C: A2, and 7075 alloy + 1%Ti powder + 5%B4C: A3) were prepared by laser additive manufacturing (LAM) technology. Their microstructure and properties were characterized by scanning electron microscopy, X-ray diffractometer, tensile testing, and wear testing. The results showed that A3 has the best tensile properties, hardness, and wear resistance due to their fine grains and good interfacial bonding strength of matrix and reinforcement. The wear mechanism of A3 changes from adhesive wear and oxidation wear to oxidative wear and bond delamination wear with increased load and sliding speed. The wear rate and friction coefficient of A3 increase with increased load and sliding speed.