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<p>AA6061 aluminium alloys shows from limited tensile strength, wear resistance, fatigue life, and creep stability under severe mechanical and thermal loading, restricting their use in advanced structural applications. To overcome these limitations, a novel hybrid AA6061–SiC–AlN metal matrix composite was developed using in situ synthesized SiC (4 wt%) and ex situ AlN particles (2–6 wt%), where AlN was sustainably synthesized from bamboo leaf ash by a controlled thermochemical route. The composites was fabricated by controlled stir casting process to asure uniform reinforcement dispersion, followed by systematic evaluation of mechanical, tribological, fatigue and creep properties in accordance with ASTM standards, supported by XRD, SEM, and EDAX analyses. The outcome revealed that composite containing 4 wt% AlN showed optimum efficiency, achieving highest tensile strength of 505&#xa0;MPa (25.8% improvement over unreinforced AA6061), while hardness increased from 145 BHN to a maximum of 181 BHN. Fatigue strength raised significantly to 294&#xa0;MPa, corresponding to enhancement of 25.5%, and the creep strain was reduced by up to 39% at 10,500&#xa0;s under elevated temperature conditions. In addition, the hybrid composites demonstrated a reduced lower specific wear rate and coefficient of friction due to the synergistic effect of hard SiC and AlN reinforcements. These improvements make the developed AA6061–SiC–AlN hybrid composite a promising candidate for automotive, defense and aerospace applications requiring high strength, wear resistance, fatigue durability, and creep stability.</p>

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High-performance sustainable AA6061–SiC–AlN hybrid composites reinforced with bamboo-derived AlN

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Sathish Kumar Shanmugam,
  • Aman Kumar,
  • Narendra Singh,
  • Mit C. Patel,
  • Puthalapattu Reddy Prasad,
  • A. Thanikasalam

摘要

AA6061 aluminium alloys shows from limited tensile strength, wear resistance, fatigue life, and creep stability under severe mechanical and thermal loading, restricting their use in advanced structural applications. To overcome these limitations, a novel hybrid AA6061–SiC–AlN metal matrix composite was developed using in situ synthesized SiC (4 wt%) and ex situ AlN particles (2–6 wt%), where AlN was sustainably synthesized from bamboo leaf ash by a controlled thermochemical route. The composites was fabricated by controlled stir casting process to asure uniform reinforcement dispersion, followed by systematic evaluation of mechanical, tribological, fatigue and creep properties in accordance with ASTM standards, supported by XRD, SEM, and EDAX analyses. The outcome revealed that composite containing 4 wt% AlN showed optimum efficiency, achieving highest tensile strength of 505 MPa (25.8% improvement over unreinforced AA6061), while hardness increased from 145 BHN to a maximum of 181 BHN. Fatigue strength raised significantly to 294 MPa, corresponding to enhancement of 25.5%, and the creep strain was reduced by up to 39% at 10,500 s under elevated temperature conditions. In addition, the hybrid composites demonstrated a reduced lower specific wear rate and coefficient of friction due to the synergistic effect of hard SiC and AlN reinforcements. These improvements make the developed AA6061–SiC–AlN hybrid composite a promising candidate for automotive, defense and aerospace applications requiring high strength, wear resistance, fatigue durability, and creep stability.