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<p>This work investigates microstructural and mechanical properties of hybrid AA7075/B<sub>4</sub>C/ZrO<sub>2</sub> composites with varying ZrO<sub>2</sub> reinforcement using spark plasma sintering. The primary objective of the work is to optimize the reinforcement content to achieve a&#xa0;balance between enhanced mechanical properties and microstructural integrity. Composites are characterized by SEM, XRD, and mechanical testing to evaluate tensile strength, compressive strength, hardness, and impact strength. It is shown that 6% ZrO<sub>2</sub> is the best reinforcement content, with tensile and compressive strength peak at 468 and 554 MPa, respectively. Beyond this level, mechanical properties degrade due to the formation of brittle phases, including intermetallic carbides (Al<sub>4</sub>C<sub>3</sub>), intermetallic compounds (Al<sub>3</sub>Zr) and increased porosity, as confirmed by the XRD analysis. Hardness values consistently increase with the higher ZrO<sub>2</sub> content, reaching the maximum hardness of 129 HV at 8% ZrO<sub>2</sub>, while the impact strength decreases due to reduced ductility from the intermetallic formation and increased brittleness.</p>

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Effect of spark plasma sintering on the addition of ZrO2 particles to AA7075/B4C composite and its mechanical properties

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • A L N Arun Kumar,
  • S. Sarveswara Reddy,
  • Thota Rajasekhar

摘要

This work investigates microstructural and mechanical properties of hybrid AA7075/B4C/ZrO2 composites with varying ZrO2 reinforcement using spark plasma sintering. The primary objective of the work is to optimize the reinforcement content to achieve a balance between enhanced mechanical properties and microstructural integrity. Composites are characterized by SEM, XRD, and mechanical testing to evaluate tensile strength, compressive strength, hardness, and impact strength. It is shown that 6% ZrO2 is the best reinforcement content, with tensile and compressive strength peak at 468 and 554 MPa, respectively. Beyond this level, mechanical properties degrade due to the formation of brittle phases, including intermetallic carbides (Al4C3), intermetallic compounds (Al3Zr) and increased porosity, as confirmed by the XRD analysis. Hardness values consistently increase with the higher ZrO2 content, reaching the maximum hardness of 129 HV at 8% ZrO2, while the impact strength decreases due to reduced ductility from the intermetallic formation and increased brittleness.