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<p>SiCp/6061Al composites reinforced with 22&#xa0;vol.% silicon carbide particles were fabricated by powder metallurgy followed by hot extrusion. The aging behavior of the extruded plates was systematically investigated after solution treatment at 540&#xa0;°C for 1.5&#xa0;h and subsequent artificial aging at 170, 180, and 190&#xa0;°C. The composite exhibited pronounced age-hardening behavior, with hardness increasing from 86.3&#xa0;HV in the as-fabricated condition to approximately 159&#xa0;HV after aging treatment. It is worth noting that a bimodal hardness response was observed at higher aging temperatures (especially 190&#xa0;°C). Transmission electron microscopy (TEM) microstructure analysis shows that the precipitation of β′′ and β′ phases is strongly affected by the high-density dislocations and sub-grain structures generated during the extrusion process, as well as the thermal mismatch between the SiC particles and the aluminum matrix. These defects provide heterogeneous nucleation sites for the precipitates and accelerate the precipitation kinetics. These findings provide new insights into the precipitation behavior and strengthening mechanism of medium volume fraction SiCp/6061Al composite extruded sheet.</p>

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Effect of Aging Treatment on Precipitation Behavior and Mechanical Properties of 22 vol.% SiCp/6061Al Composite Extruded Plates

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Yasong Xu,
  • Yujie Xiao,
  • Lin Chen,
  • Wei Chen,
  • Jinghui Li,
  • Mingya Zhang

摘要

SiCp/6061Al composites reinforced with 22 vol.% silicon carbide particles were fabricated by powder metallurgy followed by hot extrusion. The aging behavior of the extruded plates was systematically investigated after solution treatment at 540 °C for 1.5 h and subsequent artificial aging at 170, 180, and 190 °C. The composite exhibited pronounced age-hardening behavior, with hardness increasing from 86.3 HV in the as-fabricated condition to approximately 159 HV after aging treatment. It is worth noting that a bimodal hardness response was observed at higher aging temperatures (especially 190 °C). Transmission electron microscopy (TEM) microstructure analysis shows that the precipitation of β′′ and β′ phases is strongly affected by the high-density dislocations and sub-grain structures generated during the extrusion process, as well as the thermal mismatch between the SiC particles and the aluminum matrix. These defects provide heterogeneous nucleation sites for the precipitates and accelerate the precipitation kinetics. These findings provide new insights into the precipitation behavior and strengthening mechanism of medium volume fraction SiCp/6061Al composite extruded sheet.