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<p>This study examines the influence of silicon carbide (SiC) particle size on the mechanical performance of AA7075/SiC composites fabricated via microwave sintering. Composites reinforced with SiC particles of varying sizes (60.7, 10.91, 5.33, and 0.73&#xa0;μm) were synthesized, and their tensile strength, compressive strength, hardness, impact energy, and relative density were systematically evaluated. Microstructural characterization, including x-ray diffraction (XRD), was performed to elucidate the mechanisms governing the observed behavior. The results reveal a progressive improvement in mechanical properties with decreasing particle size. The composite reinforced with 0.73&#xa0;μm SiC exhibited the highest tensile strength (~362&#xa0;MPa) and compressive strength (~451&#xa0;MPa), while intermediate particle sizes of 5.33 and 10.91&#xa0;μm showed moderate improvements compared to the coarse 60.7&#xa0;μm reinforcement, which exhibited comparatively lower strength. These improvements are primarily attributed to strong interfacial bonding, reduced porosity, and the activation of multiple strengthening mechanisms, such as the Orowan strengthening, and Zener grain pinning. Microwave sintering facilitated uniform densification and microstructural homogeneity, yielding a maximum relative density of ~ 98.26% for the 60.7&#xa0;μm sample, followed by a slight decrease with finer particles. This reduction in density with decreasing particle size is attributed to increased surface energy–induced agglomeration and reduced powder flowability, which hinder effective particle rearrangement and pore elimination during compaction and sintering. However, the impact strength declined to ~ 11.5&#xa0;J for the finest reinforcement, indicating increased brittleness and a trade-off between strength and toughness.</p> Graphical Abstract <p></p>

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Study on Particle Size Variation of SiC Reinforcement in AA7075 Aluminum Matrix Composites Manufactured via Microwave Powder Metallurgy

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Guttikonda Manohar,
  • K. Venkateswara Reddy,
  • Obula Reddy Kummitha,
  • Rashed Mustafa Mazarbhuiya,
  • Saikat Ranjan Maity

摘要

This study examines the influence of silicon carbide (SiC) particle size on the mechanical performance of AA7075/SiC composites fabricated via microwave sintering. Composites reinforced with SiC particles of varying sizes (60.7, 10.91, 5.33, and 0.73 μm) were synthesized, and their tensile strength, compressive strength, hardness, impact energy, and relative density were systematically evaluated. Microstructural characterization, including x-ray diffraction (XRD), was performed to elucidate the mechanisms governing the observed behavior. The results reveal a progressive improvement in mechanical properties with decreasing particle size. The composite reinforced with 0.73 μm SiC exhibited the highest tensile strength (~362 MPa) and compressive strength (~451 MPa), while intermediate particle sizes of 5.33 and 10.91 μm showed moderate improvements compared to the coarse 60.7 μm reinforcement, which exhibited comparatively lower strength. These improvements are primarily attributed to strong interfacial bonding, reduced porosity, and the activation of multiple strengthening mechanisms, such as the Orowan strengthening, and Zener grain pinning. Microwave sintering facilitated uniform densification and microstructural homogeneity, yielding a maximum relative density of ~ 98.26% for the 60.7 μm sample, followed by a slight decrease with finer particles. This reduction in density with decreasing particle size is attributed to increased surface energy–induced agglomeration and reduced powder flowability, which hinder effective particle rearrangement and pore elimination during compaction and sintering. However, the impact strength declined to ~ 11.5 J for the finest reinforcement, indicating increased brittleness and a trade-off between strength and toughness.

Graphical Abstract