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<p>Internal combustion engines are approaching a plateau in their thermodynamic efficiency. To achieve further gains in efficiency and to reduce emissions, continued weight savings have become a critical design consideration. However, significant weight reduction is currently hindered by the need for cast components to dissipate combustion heat while maintaining shape and strength effectively. The A356 Al-Si-Mg aluminum alloy is typically heat-treated to enhance mechanical properties, but the precise effect on the secondary properties, such as thermal and electrical conductivity, often remains a secondary optimization goal. In this study, the effect of artificial aging on the alloy’s electrical conductivity was measured <i>in situ</i> to monitor and optimize the aging duration. The alloy’s electrical conductivity was examined in several conditions, including as-cast, as-quenched, T4 and overaged T7. In addition to the electrical conductivity, the microhardness and wear resistance were also evaluated under these conditions. Wear testing was conducted using a reciprocating pin-on-disc tribometer with a 6&#xa0;mm alumina ball counter body under a 5 N load. In comparison to the as-cast condition, the T4 and T7 treatments resulted in a higher coefficient of friction and a lower mass loss. However, the T4 condition exhibited a larger wear volume, whereas the T7 condition showed the lowest wear volume.</p>

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Effects of T4 and T7 Heat Treatments on the Electrical Conductivity and Wear Behaviour of A356.2 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Kyle Lessoway,
  • Lava Kumar Pillari,
  • Lukas Bichler

摘要

Internal combustion engines are approaching a plateau in their thermodynamic efficiency. To achieve further gains in efficiency and to reduce emissions, continued weight savings have become a critical design consideration. However, significant weight reduction is currently hindered by the need for cast components to dissipate combustion heat while maintaining shape and strength effectively. The A356 Al-Si-Mg aluminum alloy is typically heat-treated to enhance mechanical properties, but the precise effect on the secondary properties, such as thermal and electrical conductivity, often remains a secondary optimization goal. In this study, the effect of artificial aging on the alloy’s electrical conductivity was measured in situ to monitor and optimize the aging duration. The alloy’s electrical conductivity was examined in several conditions, including as-cast, as-quenched, T4 and overaged T7. In addition to the electrical conductivity, the microhardness and wear resistance were also evaluated under these conditions. Wear testing was conducted using a reciprocating pin-on-disc tribometer with a 6 mm alumina ball counter body under a 5 N load. In comparison to the as-cast condition, the T4 and T7 treatments resulted in a higher coefficient of friction and a lower mass loss. However, the T4 condition exhibited a larger wear volume, whereas the T7 condition showed the lowest wear volume.