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<p>The present work examines how combining a gas nitriding surface treatment with Al<sub>2</sub>O<sub>3</sub> particle reinforcement modifies the mechanical and tribological behaviour of Al–Ti metal matrix composites. Four composite grades containing 0, 3, 6, and 9&#xa0;wt.% Al<sub>2</sub>O<sub>3</sub> were fabricated via a controlled stir casting route to obtain well-dispersed ceramic particle distributions within the alloy matrix. Vickers microhardness measurements indicated a steady rise in surface resistance to indentation as the oxide content increased, attributed to the intrinsically high hardness of the alumina reinforcement. Subsequent gas nitriding further elevated surface hardness by generating a nitrogen-diffused compound layer that hindered near-surface plastic flow. Titanium present in the base alloy actively facilitated TiN formation during the nitriding cycle, and these hard nitride precipitates were identified as the principal contributors to the surface property improvements. Uniaxial tensile tests executed in compliance with ASTM E8M revealed strength gains in both reinforced and nitrided conditions, arising from enhanced interfacial load transfer and the constraining effect of nitride phases. Tribological characterisation was carried out through dry pin-on-disc sliding experiments, and the data demonstrated that both elevated reinforcement content and nitriding measurably reduced mass loss during sliding contact. Scanning electron microscopy confirmed microstructural refinement and milder wear track morphologies in treated specimens. The concurrent application of Al<sub>2</sub>O<sub>3</sub> reinforcement and nitriding yielded a synergistic enhancement in hardness, tensile strength, and tribological performance, confirming the potential of these composites for demanding structural and wear-critical service environments.</p>

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Influence of Nitriding on Strength and Tribological Performance of Al–Ti–Al2O3 Metal Matrix Composites

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • H. A. Shivappa,
  • K. Preethi,
  • Avinash T. Gatade,
  • Sanjay Ramchandra Pawar,
  • L. H. Manjunatha,
  • Mangesh Dakhole,
  • Harshal A. Chavan,
  • Manjunath Bangalore Thimmaiah

摘要

The present work examines how combining a gas nitriding surface treatment with Al2O3 particle reinforcement modifies the mechanical and tribological behaviour of Al–Ti metal matrix composites. Four composite grades containing 0, 3, 6, and 9 wt.% Al2O3 were fabricated via a controlled stir casting route to obtain well-dispersed ceramic particle distributions within the alloy matrix. Vickers microhardness measurements indicated a steady rise in surface resistance to indentation as the oxide content increased, attributed to the intrinsically high hardness of the alumina reinforcement. Subsequent gas nitriding further elevated surface hardness by generating a nitrogen-diffused compound layer that hindered near-surface plastic flow. Titanium present in the base alloy actively facilitated TiN formation during the nitriding cycle, and these hard nitride precipitates were identified as the principal contributors to the surface property improvements. Uniaxial tensile tests executed in compliance with ASTM E8M revealed strength gains in both reinforced and nitrided conditions, arising from enhanced interfacial load transfer and the constraining effect of nitride phases. Tribological characterisation was carried out through dry pin-on-disc sliding experiments, and the data demonstrated that both elevated reinforcement content and nitriding measurably reduced mass loss during sliding contact. Scanning electron microscopy confirmed microstructural refinement and milder wear track morphologies in treated specimens. The concurrent application of Al2O3 reinforcement and nitriding yielded a synergistic enhancement in hardness, tensile strength, and tribological performance, confirming the potential of these composites for demanding structural and wear-critical service environments.