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Effect of Premixing Process on the Uniform Distribution of Nano hBN and Carbon Fiber Reinforcements in AA7050 Matrix
Authors:
Nice Menachery1,2
,Shijo Thomas3
, B. Ratna Sunil3
,
B. Deepanraj3
1Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, 560 074, India
2Department of Mechanical Engineering, Jyothi Engineering College, Thrissur, 679531, India
3Department of Mechanical Engineering, College of Engineering, Prince Mohammad Bin Fahd University, Al- Khobar, 31952, Saudi Arabia
Received: 20 November 2025
Revised: 9 January 2026
Accepted: 27 January 2026
Published: 31 March 2026
Abstract:
In Aluminium metal matrix composites, achieving a homogeneous dispersion of reinforcements remains a significant challenge, especially when mixing fibrous and nanoscale reinforcements. The effect of the premixing procedure on the homogeneous dispersion of carbon fiber (CF) and nano hexagonal boron nitride (hBN) reinforcements in AA7050 matrix is studied in this work. Before composites are prepared, a multi-stage process for premixing is used, which consists of ultra-sonication, magnetic stirring, and mechanical mixing in order to minimize particle clustering. This also improves the wetting between the reinforcement and the matrix. Field emission scanning electron microscope (FESEM) was used to characterize the premixed powders to assess agglomeration behaviour, interfacial integrity, and dispersion uniformity. Due to the premixing process, better densification of nearly 95.2% and enhancement of 33.3% of micro-hardness are reported for 0.25 wt.% CF and 0.5 wt.% hBN addition. The results reveal that after the premixing process, particle dispersion was improved, leading to high-quality composites in the subsequent sintering process. The premixing process offers a better way to disperse the nano reinforcement particles in the production of aluminium metal matrix nanocomposites, which directly influences the properties of the composites.
Keywords:
AA7050, Nano hBN, Carbon fiber, Premixing, Hybrid nano composite, Powder metallurgy
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© 2026 by the authors. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)
Volume 11
Number 1
March 2026
Last Edition
Volume 11
Number 1
March 2026
How to Cite
N. Menachery, S. Thomas, B. Ratna Sunil, B. Deepanraj, Effect of Premixing Process on the Uniform Distribution of Nano hBN and Carbon Fiber Reinforcements in AA7050 Matrix. Applied Engineering Letters, 11(1), 2026: 14-21.
https://doi.org/10.46793/aeletters.2026.11.1.2