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<p>The increasing demand for lightweight, high-strength materials has driven interest in Aluminum Metal Matrix Composites (AMMCs) reinforced with ceramic particles for advanced engineering applications. This study investigates the fabrication of Aluminium alloy (AA7075) reinforced with micro sized Silicon Carbide (SiC) particles, evaluating their electrical, thermal and corrosion characteristics and microstructure. The AMMCs were fabricated through Powder Metallurgy (P/M) route, incorporating mechanical alloying and sintering methods. Four compositions were prepared: AA7075 reinforced with 17%, 15%, 13% and 0% SiC by weight proportion. Results show that adding 17 wt.% SiC has increased electrical resistivity by 28.03% and decreased electrical conductivity by 20.78%, primarily due to electron scattering at the particle–matrix interfaces. Thermal expansion is reduced by 22.89%, enhancing dimensional stability. However, corrosion resistance deteriorates, with a 36.47% increase in corrosion rate (0.11156&#xa0;mm/year) observed in seawater, attributed to micro-galvanic coupling and interfacial defects. Microstructural analysis confirms the importance of uniform SiC dispersion to reduce localized corrosion. These findings provide valuable insight for optimizing AA7075 + SiC composites, particularly for packaging and chip module applications that require a high strength to weight ratio, improved electrical and thermal stability under corrosive conditions.</p>

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Investigation of Electrical, Thermal and Corrosion Characteristics of AA7075/SiC Composites Fabricated Through Powder Metallurgy for Electronic and Structural Applications

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • K. Umamaheswari,
  • N. Natarajan,
  • P. Chakravarthi

摘要

The increasing demand for lightweight, high-strength materials has driven interest in Aluminum Metal Matrix Composites (AMMCs) reinforced with ceramic particles for advanced engineering applications. This study investigates the fabrication of Aluminium alloy (AA7075) reinforced with micro sized Silicon Carbide (SiC) particles, evaluating their electrical, thermal and corrosion characteristics and microstructure. The AMMCs were fabricated through Powder Metallurgy (P/M) route, incorporating mechanical alloying and sintering methods. Four compositions were prepared: AA7075 reinforced with 17%, 15%, 13% and 0% SiC by weight proportion. Results show that adding 17 wt.% SiC has increased electrical resistivity by 28.03% and decreased electrical conductivity by 20.78%, primarily due to electron scattering at the particle–matrix interfaces. Thermal expansion is reduced by 22.89%, enhancing dimensional stability. However, corrosion resistance deteriorates, with a 36.47% increase in corrosion rate (0.11156 mm/year) observed in seawater, attributed to micro-galvanic coupling and interfacial defects. Microstructural analysis confirms the importance of uniform SiC dispersion to reduce localized corrosion. These findings provide valuable insight for optimizing AA7075 + SiC composites, particularly for packaging and chip module applications that require a high strength to weight ratio, improved electrical and thermal stability under corrosive conditions.