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<p>This investigation explores the synergistic impact of solution heat treatment (SHT), artificial aging and deep cryogenic treatment (DCT) on the mechanical performance of a recycled architectural aluminium alloy. In response to the increasing need for sustainable materials, this study aims to improve the structural potential of recycled alloys through a custom-designed multi-stage treatment process. Aluminium obtained from recycling and melted in a coal-fired furnace and alloyed with copper, magnesium and silicon was then subjected to SHT at 520&#xa0;°C for 3&#xa0;h, followed by artificial aging at 200&#xa0;°C for 5&#xa0;h and DCT at − 196&#xa0;°C for different durations. Mechanical testing identified that the optimal heat treatment parameters increased the ultimate tensile strength (UTS) to 254&#xa0;MPa, while adding a 96&#xa0;h DCT step enhanced UTS even further to 278&#xa0;MPa and also a 5% enhancement over traditional treatments. The impact toughness exhibited a 23.48% improvement, while the fatigue life increased by 75%, accompanied by a 28.14% reduction in the fatigue crack growth rate. These enhancements are attributed to a transition in fracture mechanisms with DCT, as revealed by scanning electron microscopy analysis, from brittle inter-granular to more mixed trans-granular modes. These results show that combining cryogenic processing with standard thermal treatments may greatly enhance the mechanical characteristics of recycled aluminium alloys. The findings provide a possible avenue for repurposing waste aluminium for structural purposes, hence improving material circularity and environmental sustainability.</p>

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Investigating the mechanical performance of recycled architectural aluminium alloys under thermal and deep cryogenic treatments

  • 期刊论文

  • 发表日期：

    2025年11月30日

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  • Birendra Singh Karki,
  • Deepa Singh,
  • Saurabh Kafaltiya,
  • Akarsh Verma

摘要

This investigation explores the synergistic impact of solution heat treatment (SHT), artificial aging and deep cryogenic treatment (DCT) on the mechanical performance of a recycled architectural aluminium alloy. In response to the increasing need for sustainable materials, this study aims to improve the structural potential of recycled alloys through a custom-designed multi-stage treatment process. Aluminium obtained from recycling and melted in a coal-fired furnace and alloyed with copper, magnesium and silicon was then subjected to SHT at 520 °C for 3 h, followed by artificial aging at 200 °C for 5 h and DCT at − 196 °C for different durations. Mechanical testing identified that the optimal heat treatment parameters increased the ultimate tensile strength (UTS) to 254 MPa, while adding a 96 h DCT step enhanced UTS even further to 278 MPa and also a 5% enhancement over traditional treatments. The impact toughness exhibited a 23.48% improvement, while the fatigue life increased by 75%, accompanied by a 28.14% reduction in the fatigue crack growth rate. These enhancements are attributed to a transition in fracture mechanisms with DCT, as revealed by scanning electron microscopy analysis, from brittle inter-granular to more mixed trans-granular modes. These results show that combining cryogenic processing with standard thermal treatments may greatly enhance the mechanical characteristics of recycled aluminium alloys. The findings provide a possible avenue for repurposing waste aluminium for structural purposes, hence improving material circularity and environmental sustainability.