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<p>The influence of Fe<sub>3</sub>Al intermetallic content on the microstructure, hardness, and thermal conductivity of copper-based composites prepared by powder metallurgy was investigated. The sliding wear behavior of the composites was also evaluated using a disk-to-block configuration at speeds from 50 to 350&#xa0;km/h. The results of microstructure analysis show that Fe<sub>3</sub>Al reacted with oxygen during the long-time ball milling and formed nano-sized Al<sub>2</sub>O<sub>3</sub> particles. Incorporating 4-6% Fe<sub>3</sub>Al particles improves composite strength while retaining relatively high thermal conductivity. The average friction coefficient (AFC) of the 6% Fe<sub>3</sub>Al/composite is higher and more stable. At high-speed braking conditions, the internal oxidation formation of high-hardness Al<sub>2</sub>O<sub>3</sub> mitigates thermal softening of the composite and contributes to a stable COF.</p>

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Fe3Al/Copper-Based Composites on the Microstructure Evolution and Braking Performance during High-Speed Brake Process

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Yajun Zhou,
  • Xin Zhang,
  • Jianxiu Liu,
  • Sanming Du,
  • Shen Kai,
  • Yongzhen Zhang

摘要

The influence of Fe3Al intermetallic content on the microstructure, hardness, and thermal conductivity of copper-based composites prepared by powder metallurgy was investigated. The sliding wear behavior of the composites was also evaluated using a disk-to-block configuration at speeds from 50 to 350 km/h. The results of microstructure analysis show that Fe3Al reacted with oxygen during the long-time ball milling and formed nano-sized Al2O3 particles. Incorporating 4-6% Fe3Al particles improves composite strength while retaining relatively high thermal conductivity. The average friction coefficient (AFC) of the 6% Fe3Al/composite is higher and more stable. At high-speed braking conditions, the internal oxidation formation of high-hardness Al2O3 mitigates thermal softening of the composite and contributes to a stable COF.