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<p>Ti-6Al-4&#xa0;V is a titanium alloy widely used in aerospace and other demanding applications. To enhance its performance in harsh environments, this study employs Laser Directed Energy Deposition (LDED) to fabricate composite coatings incorporating varying contents of B<sub>4</sub>C (x = 0-6 wt.%) into the Ti-6Al-4&#xa0;V matrix. The microstructure and corrosion resistance of the resulting coatings are systematically investigated. The results indicate that the addition of B<sub>4</sub>C leads to the in-situ formation of reinforcing phases such as TiC, TiB<sub>2</sub>, and TiB around the B<sub>4</sub>C particles, accompanied by a significant refinement of the matrix grain size. However, the potential difference between these reinforcement phases and the matrix gives rise to micro-galvanic cells, which compromise the passivation behavior of the coating and consequently reduce its corrosion resistance. Among the samples, the coating without B<sub>4</sub>C exhibited the highest corrosion resistance. In summary, while the incorporation of B<sub>4</sub>C markedly refines the microstructure of Ti-6Al-4&#xa0;V coatings, its detrimental effect on corrosion resistance must be carefully considered for practical applications.</p>

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Effect of B4C Content on the Microstructure and Corrosion Properties of In-Situ Reinforced Ti-6Al-4 V Coatings by Laser Directed Energy Deposition Technology

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Wenlong Wang,
  • Kai Zhang,
  • Fangfang Wu,
  • Weijun Liu

摘要

Ti-6Al-4 V is a titanium alloy widely used in aerospace and other demanding applications. To enhance its performance in harsh environments, this study employs Laser Directed Energy Deposition (LDED) to fabricate composite coatings incorporating varying contents of B4C (x = 0-6 wt.%) into the Ti-6Al-4 V matrix. The microstructure and corrosion resistance of the resulting coatings are systematically investigated. The results indicate that the addition of B4C leads to the in-situ formation of reinforcing phases such as TiC, TiB2, and TiB around the B4C particles, accompanied by a significant refinement of the matrix grain size. However, the potential difference between these reinforcement phases and the matrix gives rise to micro-galvanic cells, which compromise the passivation behavior of the coating and consequently reduce its corrosion resistance. Among the samples, the coating without B4C exhibited the highest corrosion resistance. In summary, while the incorporation of B4C markedly refines the microstructure of Ti-6Al-4 V coatings, its detrimental effect on corrosion resistance must be carefully considered for practical applications.