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<p>Evolution of science and technology creates an opportunity to produce innovative material like composite, which are having better strength features, and durability. Metal matrix composites (MMCs) is one such material, are researched widely under various application by research scholars, because of their importance in recent days. However the fabrication of MMC, without reinforcement, aluminum alloys exhibit low wear resistance, poor high-temperature strength, and reduced stiffness. Thus, the present study aims to investigate the mechanical, wear, fatigue, and creep behavior of AA7475-based composites reinforced with biogenic silicon nitride (Si₃N₄) at varying weight percentages. The tensile strength, Izod impact strength, and hardness measurements indicate that specimen AB2, containing 3 wt% Si₃N₄, exhibits superior mechanical performance, achieving a tensile strength of 508&#xa0;MPa, impact strength of 21&#xa0;J, and hardness of 158 VHN. The enhanced properties in AB2 are attributed to the uniform dispersion of Si₃N₄ particles, which strengthen the matrix and restrict dislocation motion, thereby improving both strength and toughness. The fatigue test results further confirm that AB2 has the highest fatigue strength of 310&#xa0;MPa, indicating its ability to withstand cyclic loading due to better reinforcement-matrix interaction, which delays crack initiation and propagation. In contrast, specimen AB3, containing 5 wt% Si₃N₄, demonstrates superior tribological properties, recording the lowest Sp.wear rate of 0.0099&#xa0;mm³/Nm and COF of 0.50, owing to the increased ceramic phase content. Additionally, AB3 exhibits the highest creep strain, with values increasing from 0.17 at 2000s to 1.53 at 10000s, indicating greater susceptibility to time-dependent deformation due to the matrix’s inability to resist prolonged stress at elevated reinforcement levels. The scanning electron microscopy (SEM) analysis further validates these findings, showing uniform filler dispersion in AB2, which enhances mechanical and fatigue properties, while AB3 displays agglomerated filler particles, leading to structural stiffness and brittleness, which benefit wear resistance but negatively affect creep and toughness. These results indicate that AB2 is the optimal composite for applications requiring superior mechanical and fatigue performance, while AB3 is more suited for environments demanding enhanced wear and creep resistance.</p>

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Mechanical, wear, fatigue and creep behavior of biogenic Si3N4-reinforced AA 7475 metal matrix composite

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • D Srinivasan,
  • V. Balaji,
  • R. Kumutha,
  • S. Hanish Anand

摘要

Evolution of science and technology creates an opportunity to produce innovative material like composite, which are having better strength features, and durability. Metal matrix composites (MMCs) is one such material, are researched widely under various application by research scholars, because of their importance in recent days. However the fabrication of MMC, without reinforcement, aluminum alloys exhibit low wear resistance, poor high-temperature strength, and reduced stiffness. Thus, the present study aims to investigate the mechanical, wear, fatigue, and creep behavior of AA7475-based composites reinforced with biogenic silicon nitride (Si₃N₄) at varying weight percentages. The tensile strength, Izod impact strength, and hardness measurements indicate that specimen AB2, containing 3 wt% Si₃N₄, exhibits superior mechanical performance, achieving a tensile strength of 508 MPa, impact strength of 21 J, and hardness of 158 VHN. The enhanced properties in AB2 are attributed to the uniform dispersion of Si₃N₄ particles, which strengthen the matrix and restrict dislocation motion, thereby improving both strength and toughness. The fatigue test results further confirm that AB2 has the highest fatigue strength of 310 MPa, indicating its ability to withstand cyclic loading due to better reinforcement-matrix interaction, which delays crack initiation and propagation. In contrast, specimen AB3, containing 5 wt% Si₃N₄, demonstrates superior tribological properties, recording the lowest Sp.wear rate of 0.0099 mm³/Nm and COF of 0.50, owing to the increased ceramic phase content. Additionally, AB3 exhibits the highest creep strain, with values increasing from 0.17 at 2000s to 1.53 at 10000s, indicating greater susceptibility to time-dependent deformation due to the matrix’s inability to resist prolonged stress at elevated reinforcement levels. The scanning electron microscopy (SEM) analysis further validates these findings, showing uniform filler dispersion in AB2, which enhances mechanical and fatigue properties, while AB3 displays agglomerated filler particles, leading to structural stiffness and brittleness, which benefit wear resistance but negatively affect creep and toughness. These results indicate that AB2 is the optimal composite for applications requiring superior mechanical and fatigue performance, while AB3 is more suited for environments demanding enhanced wear and creep resistance.