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<p>The liquid stir-casting process is a well-established method for synthesizing aluminium alloy composites, offering economic advantages over solid-state methods. However, uneven particle dispersion and agglomeration have a negative effect on the overall functional properties of composites. The research objectives are to reduce agglomeration and enhance the mechanical properties of an aluminium alloy (Al7075) composite via vacuum-aided stir casting. Final composite contained 2 wt% of titanium dioxide (TiO<sub>2</sub>) and 1-5 wt% of boron carbide (B<sub>4</sub>C) nanoparticles. Meanwhile, a 1% magnesium wettability agent is introduced to enhance the wettability of the behaviour, and argon inert gas is applied throughout the fabrication process to limit oxide formation. The effect of processing and integration of hybrid nanoparticles on the microstructure, grain size, and mechanical behaviour of Al7075 alloy composites is evaluated, and transmission electron microscopy confirms the uniform distribution of the reinforcements. Among the tested samples, the composite with 2 wt% TiO<sub>2</sub> and 3 wt% B<sub>4</sub>C nanoparticles exhibited the best performance, showing a density of 2.75 g/cm<sup>3</sup>, a reduced grain size of 50.1 µm, improved yield strength (352 MPa) and tensile strength (460 MPa), a slight reduction in energy absorption (15.2 J), and higher hardness (182 HV), compared to the monolithic Al7075 alloy without reinforcement. The results demonstrate that the developed composite with optimized reinforcement content offers significant potential for automotive applications requiring high-strength-to-weight ratio components.</p>

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Vacuum-Aided Stir Cast Processing and Oxide/Carbide Actions on Metallurgical and Mechanical Properties of Al7075 Alloy Composite

  • 期刊论文

  • 发表日期：

    2025年11月30日

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  • M. Aruna,
  • N. Nagabhooshanam,
  • Rintu Kumar,
  • Mamata Chahar,
  • T. Sudhakar,
  • N. B. C. S. N. Murthy,
  • Ramya Maranan,
  • T. Thirugnanasambandham,
  • S. Sathiyamurthy

摘要

The liquid stir-casting process is a well-established method for synthesizing aluminium alloy composites, offering economic advantages over solid-state methods. However, uneven particle dispersion and agglomeration have a negative effect on the overall functional properties of composites. The research objectives are to reduce agglomeration and enhance the mechanical properties of an aluminium alloy (Al7075) composite via vacuum-aided stir casting. Final composite contained 2 wt% of titanium dioxide (TiO2) and 1-5 wt% of boron carbide (B4C) nanoparticles. Meanwhile, a 1% magnesium wettability agent is introduced to enhance the wettability of the behaviour, and argon inert gas is applied throughout the fabrication process to limit oxide formation. The effect of processing and integration of hybrid nanoparticles on the microstructure, grain size, and mechanical behaviour of Al7075 alloy composites is evaluated, and transmission electron microscopy confirms the uniform distribution of the reinforcements. Among the tested samples, the composite with 2 wt% TiO2 and 3 wt% B4C nanoparticles exhibited the best performance, showing a density of 2.75 g/cm3, a reduced grain size of 50.1 µm, improved yield strength (352 MPa) and tensile strength (460 MPa), a slight reduction in energy absorption (15.2 J), and higher hardness (182 HV), compared to the monolithic Al7075 alloy without reinforcement. The results demonstrate that the developed composite with optimized reinforcement content offers significant potential for automotive applications requiring high-strength-to-weight ratio components.