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<p>This study presents a systematic investigation into the microstructural and mechanical behavior of AA7075 hybrid composites reinforced with silicon carbide (SiC) and zirconia (ZrO<sub>2</sub>) fabricated via conventional powder metallurgy techniques. Unlike many previous studies that primarily focus on advanced sintering routes, the present work demonstrates that significant mechanical enhancement can be achieved using a cost-effective processing approach through optimized hybrid reinforcement design. The selection of SiC and ZrO<sub>2</sub> was based on their complementary strengthening mechanisms, where SiC contributes high hardness and load-bearing capability, while ZrO<sub>2</sub> enhances fracture resistance through transformation toughening. The results reveal that the optimized composite containing 7 wt.% SiC and 3 wt.% ZrO<sub>2</sub> exhibits a substantial improvement in compressive strength and hardness, reaching 225 MPa and 112 HV, respectively, compared to 95 MPa and 75 HV for the unreinforced AA7075 matrix. Microstructural analysis confirms uniform reinforcement dispersion and effective interfacial bonding, which underpin the observed mechanical enhancement. The findings establish the effectiveness of hybrid reinforcement in significantly improving the compressive performance of AA7075 composites and highlight the potential of conventional powder metallurgy as a viable route for developing high-performance aluminum matrix composites for structural applications.</p>

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Investigation on Microstructural and Mechanical Properties of AA7075/SiC/ZrO2 Hybrid Composite Fabricated through Powder Metallurgy Techniques

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • U. Sudhakar,
  • K. V. Raghavulu,
  • Ananda Mohan Vemula,
  • Suresh Shetty,
  • Haiter Lenin Allasi,
  • Mary Vasanthi Soosaimariyan

摘要

This study presents a systematic investigation into the microstructural and mechanical behavior of AA7075 hybrid composites reinforced with silicon carbide (SiC) and zirconia (ZrO2) fabricated via conventional powder metallurgy techniques. Unlike many previous studies that primarily focus on advanced sintering routes, the present work demonstrates that significant mechanical enhancement can be achieved using a cost-effective processing approach through optimized hybrid reinforcement design. The selection of SiC and ZrO2 was based on their complementary strengthening mechanisms, where SiC contributes high hardness and load-bearing capability, while ZrO2 enhances fracture resistance through transformation toughening. The results reveal that the optimized composite containing 7 wt.% SiC and 3 wt.% ZrO2 exhibits a substantial improvement in compressive strength and hardness, reaching 225 MPa and 112 HV, respectively, compared to 95 MPa and 75 HV for the unreinforced AA7075 matrix. Microstructural analysis confirms uniform reinforcement dispersion and effective interfacial bonding, which underpin the observed mechanical enhancement. The findings establish the effectiveness of hybrid reinforcement in significantly improving the compressive performance of AA7075 composites and highlight the potential of conventional powder metallurgy as a viable route for developing high-performance aluminum matrix composites for structural applications.