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<p>This study examines the tribological and mechanical properties of Al7075 aluminium alloy reinforced with silicon carbide (SiC) and titanium diboride (TiB<sub>2</sub>) particles using the stir casting process. Reinforced composites showed improved density, hardness, and wear resistance, with TiB<sub>2</sub> offering superior performance. Microhardness increased linearly with reinforcement content, and TiB<sub>2</sub> composites achieved up to 6.67% higher hardness than SiC due to finer grain structure and better interfacial bonding. Tribological tests under dry sliding (500–2000 m) revealed lower wear rates and friction coefficients for TiB<sub>2</sub> composites, attributed to reduced porosity and improved grain boundary strength. Worn surface analysis indicated a shift from abrasive to adhesive wear at longer distances, with TiB<sub>2</sub> aiding wear stability through enhanced heat dissipation, tribo-film formation, and less debris. These results highlight the superior mechanical and tribological behavior of TiB<sub>2</sub>-reinforced Al7075, making them ideal for aerospace and automotive applications demanding strength, durability, and lightweight properties.</p> Graphical Abstract <p></p>

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Tribological behavior and microstructural characteristics of stir-cast Al7075/SiC and Al7075/TiB₂ composites

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Abhijit Bhowmik,
  • Binayak Sen,
  • Raman Kumar,
  • Aravindan Munusamy Kalidass,
  • Binayak Pattanayak,
  • Abdulaziz Alhazaa,
  • Varadarajula Krishna Kanth,
  • Valentin Romanovski

摘要

This study examines the tribological and mechanical properties of Al7075 aluminium alloy reinforced with silicon carbide (SiC) and titanium diboride (TiB2) particles using the stir casting process. Reinforced composites showed improved density, hardness, and wear resistance, with TiB2 offering superior performance. Microhardness increased linearly with reinforcement content, and TiB2 composites achieved up to 6.67% higher hardness than SiC due to finer grain structure and better interfacial bonding. Tribological tests under dry sliding (500–2000 m) revealed lower wear rates and friction coefficients for TiB2 composites, attributed to reduced porosity and improved grain boundary strength. Worn surface analysis indicated a shift from abrasive to adhesive wear at longer distances, with TiB2 aiding wear stability through enhanced heat dissipation, tribo-film formation, and less debris. These results highlight the superior mechanical and tribological behavior of TiB2-reinforced Al7075, making them ideal for aerospace and automotive applications demanding strength, durability, and lightweight properties.

Graphical Abstract