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<p>The current investigation focuses on using agricultural waste (rice hull) to produce a by-product containing SiO<sub>2</sub> using pyrolysis process. The aim is to replace commercial reinforcements with SiO<sub>2</sub> to create a sustainable environment. Metal matrix composites (MMCs) were fabricated using ultrasonic stir casting technique, where SiO<sub>2</sub> reinforcement from rice hull waste was added to molten AA7075 matrix alloy. The investigation evaluates the tensile strength, yield strength, and wear behaviour of the composites, comparing them with monolithic material. The reinforcement percentage ranges from 2 to 8 wt.% in steps of 2 wt.% of SiO<sub>2</sub>. Field emission scanning electron microscope (FESEM) and EDS mapping were employed to evaluate the microstructure of the composites. Optical microscopy (OM) analysis revealed that the base alloy features a lamellar eutectic structure within the dendritic areas, comprising α(Al) and η(MgZn<sub>2</sub>) phases, along with some inter-dendritic S(Al<sub>2</sub>CuMg) phases. Nevertheless, AA7075-6 wt.% SiO<sub>2</sub> composite exhibited an enhancement of 27.99% in ultimate tensile strength compared to base alloy. The wear rate was observed to be minimum at (10N, 15N, and 20N) load for 6 wt.% SiO<sub>2</sub>. It is essential to consider the optimal percentage of SiO<sub>2</sub> to prevent the formation of porosity, which could adversely affect the mechanical and tribological properties of the composites.</p>

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Synthesis and Characterization of Al-Zn-Mg Composites Reinforced with Rice Hull-Derived SiO2 using Ultrasonic Stir Casting Route

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Swapna Banoth,
  • Suresh Babu Valasingam

摘要

The current investigation focuses on using agricultural waste (rice hull) to produce a by-product containing SiO2 using pyrolysis process. The aim is to replace commercial reinforcements with SiO2 to create a sustainable environment. Metal matrix composites (MMCs) were fabricated using ultrasonic stir casting technique, where SiO2 reinforcement from rice hull waste was added to molten AA7075 matrix alloy. The investigation evaluates the tensile strength, yield strength, and wear behaviour of the composites, comparing them with monolithic material. The reinforcement percentage ranges from 2 to 8 wt.% in steps of 2 wt.% of SiO2. Field emission scanning electron microscope (FESEM) and EDS mapping were employed to evaluate the microstructure of the composites. Optical microscopy (OM) analysis revealed that the base alloy features a lamellar eutectic structure within the dendritic areas, comprising α(Al) and η(MgZn2) phases, along with some inter-dendritic S(Al2CuMg) phases. Nevertheless, AA7075-6 wt.% SiO2 composite exhibited an enhancement of 27.99% in ultimate tensile strength compared to base alloy. The wear rate was observed to be minimum at (10N, 15N, and 20N) load for 6 wt.% SiO2. It is essential to consider the optimal percentage of SiO2 to prevent the formation of porosity, which could adversely affect the mechanical and tribological properties of the composites.