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<p>The previous work done on Al7075-AlN composites includes little discussion on the effect of different stirring rates on distribution and mechanical properties. Thus, the current study aims to focus on maximizing stirring speed for better microstructure uniformity and mechanical performance. This research is focused on the microstructural and mechanical behavior of Al7075 alloy and Al7075 reinforced with 9% Aluminium Nitride (AlN) composites prepared by stir casting process at various stirring speeds i.e., 200, 400 and 600&#xa0;rpm. The SEM images indicated that at a speed of 400&#xa0;rpm reinforcing particles dispersion was homogeneous while at 200 and 600&#xa0;rpm agglomeration and turbulence-induced defects respectively were observed in wide regions. Mechanical testing demonstrated a significant enhancement in properties with respect to addition of reinforcement. The Brinell hardness increased from 91 BHN for base alloy to a maximum of 136 BHN at 400&#xa0;rpm, which is an approximate enhancement of 49.45%. Similarly, UTS is augmenting from 192 to 274&#xa0;MPa (42.70%) and YS is improving from 122 to 174 Mpa (42.62%). But the percentage elongation reduces from 12.6% for the base alloy to 8.5% at 400&#xa0;rpm indicating there is a compromise between strength and ductility. Thus, the composite fabricated at 400&#xa0;rpm shows better microstructural homogeneity and mechanical properties improvements. It suggests that stirring speed is a crucial parameter for property tailoring of Al7075-AlN composites intended for advanced engineering applications.</p>

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Study of Influence of Varying Stirring Speeds on the Mechanical Characteristics of Aluminium Alloy-Aluminium Nitride Composites

  • 期刊论文

  • 发表日期：

    2026年6月21日

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  • R. Vijayakumar,
  • B. G. Avilasha,
  • K. V. Pradeep Kumar,
  • M. Rajanish,
  • Kanneganti Jyothishya Brahma Chari,
  • M. Thanuj Kumar,
  • M. M. Venugopal,
  • Subash Acharya,
  • S. Udayashankar

摘要

The previous work done on Al7075-AlN composites includes little discussion on the effect of different stirring rates on distribution and mechanical properties. Thus, the current study aims to focus on maximizing stirring speed for better microstructure uniformity and mechanical performance. This research is focused on the microstructural and mechanical behavior of Al7075 alloy and Al7075 reinforced with 9% Aluminium Nitride (AlN) composites prepared by stir casting process at various stirring speeds i.e., 200, 400 and 600 rpm. The SEM images indicated that at a speed of 400 rpm reinforcing particles dispersion was homogeneous while at 200 and 600 rpm agglomeration and turbulence-induced defects respectively were observed in wide regions. Mechanical testing demonstrated a significant enhancement in properties with respect to addition of reinforcement. The Brinell hardness increased from 91 BHN for base alloy to a maximum of 136 BHN at 400 rpm, which is an approximate enhancement of 49.45%. Similarly, UTS is augmenting from 192 to 274 MPa (42.70%) and YS is improving from 122 to 174 Mpa (42.62%). But the percentage elongation reduces from 12.6% for the base alloy to 8.5% at 400 rpm indicating there is a compromise between strength and ductility. Thus, the composite fabricated at 400 rpm shows better microstructural homogeneity and mechanical properties improvements. It suggests that stirring speed is a crucial parameter for property tailoring of Al7075-AlN composites intended for advanced engineering applications.