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<p>This study presents the development of Al–TiB<sub>2</sub> functionally graded composites fabricated via centrifugal casting at mould speeds of 1000, 1100, and 1200&#xa0;rpm for automotive applications. The influence of mould speed during fabrication on mechanical, tribological, and corrosion properties of the material was systematically investigated. Sliding wear was assessed under dry conditions using a pin-on-disc tribometer against EN31 steel at 160&#xa0;rpm under loads of 10, 20, 30, 40, and 50 N. Worn surfaces were examined to correlate microstructure with performance. Corrosion behaviour was evaluated through potentiodynamic polarization in 3.5% NaCl solution. Results indicate that TiB<sub>2</sub> reinforcement significantly enhances tensile strength, wear resistance, and corrosion resistance. The composite produced at 1100&#xa0;rpm exhibited the highest ultimate tensile strength of 271&#xa0;MPa, an elastic modulus of 85.65 GPa, the lowest friction coefficient of 0.39, the lowest wear volume of 0.42 mm<sup>3</sup>, and the lowest corrosion rate of 0.0003&#xa0;mm/year among the tested samples. Composites fabricated at 1100&#xa0;rpm show better properties in terms of tensile strength, corrosion, and wear resistance due to better reinforcement particle distribution with no agglomeration. These findings demonstrate that centrifugal casting provides controlled microstructural refinement, resulting in Al–TiB<sub>2</sub> composites with superior mechanical and anticorrosive performance, making them promising candidates for advanced automotive components.</p>

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Study of Dry Sliding Wear and Corrosion of Al–7.5%TiB2 Functionally Graded Composites

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Basudeb Rajak,
  • Rupesh Kumar,
  • Uppu Srinivas Rao,
  • Rakesh Kumar Gautam

摘要

This study presents the development of Al–TiB2 functionally graded composites fabricated via centrifugal casting at mould speeds of 1000, 1100, and 1200 rpm for automotive applications. The influence of mould speed during fabrication on mechanical, tribological, and corrosion properties of the material was systematically investigated. Sliding wear was assessed under dry conditions using a pin-on-disc tribometer against EN31 steel at 160 rpm under loads of 10, 20, 30, 40, and 50 N. Worn surfaces were examined to correlate microstructure with performance. Corrosion behaviour was evaluated through potentiodynamic polarization in 3.5% NaCl solution. Results indicate that TiB2 reinforcement significantly enhances tensile strength, wear resistance, and corrosion resistance. The composite produced at 1100 rpm exhibited the highest ultimate tensile strength of 271 MPa, an elastic modulus of 85.65 GPa, the lowest friction coefficient of 0.39, the lowest wear volume of 0.42 mm3, and the lowest corrosion rate of 0.0003 mm/year among the tested samples. Composites fabricated at 1100 rpm show better properties in terms of tensile strength, corrosion, and wear resistance due to better reinforcement particle distribution with no agglomeration. These findings demonstrate that centrifugal casting provides controlled microstructural refinement, resulting in Al–TiB2 composites with superior mechanical and anticorrosive performance, making them promising candidates for advanced automotive components.