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<p>Aluminum–Silicon alloys are valued for their mechanical strength and wear resistance, which can be enhanced through heat treatment. This study reported the effect of age hardening time on the microstructure and wear behavior of Al-15Si-6Ni-2Cu alloy subjected to T6 heat treatment, involving solutionizing at 510&#xa0;°C and age hardening (ageing) at 220&#xa0;°C for 2-8&#xa0;hours. The microstructure of age hardened alloys is characterized by spheroidization of Si particles and precipitation of Ni-rich and Al<sub>2</sub>Cu phases, offering high wear resistance and low friction coefficient under sliding conditions. The 4&#xa0;h age hardened alloy resulted in the superior microstructure, with precipitation of intermetallic phases and reduced the wear rate up to 45% with a significant reduction in friction compared to that of as-cast alloy. On the contrary, over ageing caused precipitate coarsening, resulting in poor wear behavior. The present study highlights the necessity of precise control over age hardening time for obtaining optimal wear performance in hypereutectic Al–Si–Ni–Cu alloys for advanced engineering applications.</p>

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Effect of Aging Time on the Microstructure and the Wear Behavior of Al-15Si-6Ni-2Cu Alloy

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • K. Raju,
  • T. Jagadeesha,
  • Mehabubsubahani R. Alavandi,
  • Rajashekar V. Kurahatti,
  • Dayanand M. Goudar

摘要

Aluminum–Silicon alloys are valued for their mechanical strength and wear resistance, which can be enhanced through heat treatment. This study reported the effect of age hardening time on the microstructure and wear behavior of Al-15Si-6Ni-2Cu alloy subjected to T6 heat treatment, involving solutionizing at 510 °C and age hardening (ageing) at 220 °C for 2-8 hours. The microstructure of age hardened alloys is characterized by spheroidization of Si particles and precipitation of Ni-rich and Al2Cu phases, offering high wear resistance and low friction coefficient under sliding conditions. The 4 h age hardened alloy resulted in the superior microstructure, with precipitation of intermetallic phases and reduced the wear rate up to 45% with a significant reduction in friction compared to that of as-cast alloy. On the contrary, over ageing caused precipitate coarsening, resulting in poor wear behavior. The present study highlights the necessity of precise control over age hardening time for obtaining optimal wear performance in hypereutectic Al–Si–Ni–Cu alloys for advanced engineering applications.