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<p>Aluminium alloy composites are promising for high-strength-to-weight ratio structural applications, and the liquid stir-casting process is used to create designs with improved structural, economic, and functional properties. However, this technique revealed that the random dispersion of reinforcement, porosity, and poor wettability limit the overall characteristics of composites. The main objectives of this study are to synthesize and evaluate the microstructural and mechanical properties of an aluminium alloy (A356) composite composed of 1% graphene nanoplatelets (GNP) and 0–6% carbon nanotubes (CNT) using an ultrasonic-aided squeeze stir-casting route. During the process, argon degassing gas and 1% of potassium hexafluorotitanate (K<sub>2</sub>TiF<sub>6</sub>) are utilized to limit oxide formation and enhance the wettability behaviour, which leads to a better matrix and reinforcement interface. The effectiveness of composite processing and hybrid reinforcements on the mechanical and microstructural behaviour of composites is studied and related to the base A356 alloy cast. It results demonstrate that efficient ultrasonic treatment with a high-frequency rate promotes homogeneous particle dispersion and breaks the agglomeration behaviour. It results in a better interface between the matrix and reinforcements, and the combined action of GNP with CNT provides superior functional characteristics. The composite, containing 1% GNP and 4% CNT, exhibits an optimum microhardness of 112&#xa0;HV0.1, a higher tensile stress behaviour of 325&#xa0;MPa, and better impact strength behaviour of 15.2&#xa0;J/cm<sup>2</sup>, respectively. The significance of ultrasonic-aided stir casting lies in its ability to uniformly disperse particles, resulting in marginal increases in porosity values and a higher content of CNT, reaching a maximum of 0.75%.</p>

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Effect of Graphene and Carbon Nanotubes Featured High-Performance Aluminium Alloy Hybrid Composites Made with Ultrasonic-Aided Stir Cast: Performance Study

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Gopal Kaliyaperumal,
  • N. Nagabhooshanam,
  • Sharad Rathore,
  • Ankur Kulshreshta,
  • C. Santha Sheela,
  • D. Beulah,
  • Ramya Maranan,
  • M. Mohan,
  • S. Sathiyamurthy

摘要

Aluminium alloy composites are promising for high-strength-to-weight ratio structural applications, and the liquid stir-casting process is used to create designs with improved structural, economic, and functional properties. However, this technique revealed that the random dispersion of reinforcement, porosity, and poor wettability limit the overall characteristics of composites. The main objectives of this study are to synthesize and evaluate the microstructural and mechanical properties of an aluminium alloy (A356) composite composed of 1% graphene nanoplatelets (GNP) and 0–6% carbon nanotubes (CNT) using an ultrasonic-aided squeeze stir-casting route. During the process, argon degassing gas and 1% of potassium hexafluorotitanate (K2TiF6) are utilized to limit oxide formation and enhance the wettability behaviour, which leads to a better matrix and reinforcement interface. The effectiveness of composite processing and hybrid reinforcements on the mechanical and microstructural behaviour of composites is studied and related to the base A356 alloy cast. It results demonstrate that efficient ultrasonic treatment with a high-frequency rate promotes homogeneous particle dispersion and breaks the agglomeration behaviour. It results in a better interface between the matrix and reinforcements, and the combined action of GNP with CNT provides superior functional characteristics. The composite, containing 1% GNP and 4% CNT, exhibits an optimum microhardness of 112 HV0.1, a higher tensile stress behaviour of 325 MPa, and better impact strength behaviour of 15.2 J/cm2, respectively. The significance of ultrasonic-aided stir casting lies in its ability to uniformly disperse particles, resulting in marginal increases in porosity values and a higher content of CNT, reaching a maximum of 0.75%.