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<p>Nitinol reinforcement in aluminium matrix composites enhances strength through stress-induced phase transformation and enables self-healing. This enhanced durability makes it ideal for structural, automotive, aerospace, naval, and defense applications. This study experimentally and theoretically investigates Nitinol fiber-reinforced Al5083 MMC, fabricated using a rotating mold vacuum furnace. The influence of Nitinol wire size and weight fraction on the composite’s performance was investigated. A significant improvement was observed in the mechanical and thermal behaviour of the composite. Yield strength increased from 232 to 306&#xa0;MPa, while ultimate tensile strength rose from 315 to 395&#xa0;MPa. The elastic modulus increased from 72 to 96&#xa0;GPa, whereas percentage elongation decreased from 21.63 to 11.54%. Additionally, flexural strength improved from 324.5 to 418&#xa0;MPa, and bending modulus increased from 75 to 91 GPa. Thermal conductivity and thermal diffusivity decreased from 118 to 104 W/m-K and from 46 to 32 mm<sup>2</sup>/s, respectively, while heat capacity reduced from 895 to 847&#xa0;J/kg-K. The fabricated composites exhibited a strength recovery ranging from 22 to 78%. Scanning electron microscopy (SEM) analysis revealed elemental diffusion at the aluminium-Nitinol interface and a mixed ductile-brittle fracture in the composite. Etching and coating of Nitinol wire enhanced interfacial bonding strength. Grey Wolf Optimization determined the optimal performance weighting, with the Al + 9%NiTi_0.6&#xa0;mm composite ranking first among all samples.</p>

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Optimization of Nitinol Wire Reinforcement in Al5083 Composites: Influence of Wire Diameter and Volume Fraction

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Shivam Mishra,
  • Mukesh Kumar,
  • Amar Patnaik

摘要

Nitinol reinforcement in aluminium matrix composites enhances strength through stress-induced phase transformation and enables self-healing. This enhanced durability makes it ideal for structural, automotive, aerospace, naval, and defense applications. This study experimentally and theoretically investigates Nitinol fiber-reinforced Al5083 MMC, fabricated using a rotating mold vacuum furnace. The influence of Nitinol wire size and weight fraction on the composite’s performance was investigated. A significant improvement was observed in the mechanical and thermal behaviour of the composite. Yield strength increased from 232 to 306 MPa, while ultimate tensile strength rose from 315 to 395 MPa. The elastic modulus increased from 72 to 96 GPa, whereas percentage elongation decreased from 21.63 to 11.54%. Additionally, flexural strength improved from 324.5 to 418 MPa, and bending modulus increased from 75 to 91 GPa. Thermal conductivity and thermal diffusivity decreased from 118 to 104 W/m-K and from 46 to 32 mm2/s, respectively, while heat capacity reduced from 895 to 847 J/kg-K. The fabricated composites exhibited a strength recovery ranging from 22 to 78%. Scanning electron microscopy (SEM) analysis revealed elemental diffusion at the aluminium-Nitinol interface and a mixed ductile-brittle fracture in the composite. Etching and coating of Nitinol wire enhanced interfacial bonding strength. Grey Wolf Optimization determined the optimal performance weighting, with the Al + 9%NiTi_0.6 mm composite ranking first among all samples.