Abstract :

The Present Study Focuses On The Development And Characterization Of Hybrid Metal Matrix Composites (MMCs) Based On Aerospace-grade Aluminium Alloy Al-7075 Reinforced With Ceramic And Nano-scale Particulates. Boron Carbide (B₄C), Silicon Carbide (SiC), Titanium Diboride (TiB₂), And Graphene Nanoplatelets Were Selected As Reinforcements To Enhance The Mechanical, Tribological, And Functional Properties Of The Base Alloy. Five Material Systems Were Fabricated: Pure Al-7075 As The Baseline And Four Hybrid Composite Compositions With Varying Reinforcement Contents, Namely: (i) Pure Al-7075, (ii) 93% Al-7075 + 2% B₄C + 2% SiC + 2% TiB₂ + 1% Graphene, (iii) 91% Al-7075 + 3% B₄C + 3% SiC + 2% TiB₂ + 1% Graphene, And (iv) 89% Al-7075 + 4% B₄C + 4% SiC + 2% TiB₂ + 1% Graphene, All Expressed In Weight Percentages. The Hybrid Composites Were Fabricated Using The Stir Casting Technique Combined With Ultrasonic Assistance To Achieve Uniform Dispersion Of Reinforcements And Improved Interfacial Bonding Between The Matrix And Particles. The Fabricated Specimens Were Subjected To Comprehensive Experimental Investigations, Including Tensile, Compressive, Flexural, Hardness, Impact, And Wear Tests Using A Pin-on-disc Tribometer. Comparative Analysis Between The Baseline Alloy And Reinforced Composites Was Carried Out To Evaluate The Influence Of Incremental Ceramic And Graphene Additions On Mechanical Strength, Hardness, Wear Resistance, Ductility, And Overall Performance. The Results Demonstrate That The Incorporation Of B₄C, SiC, TiB₂, And Graphene Significantly Enhances The Mechanical And Tribological Properties Of Al-7075, While Also Revealing A Trade-off Between Strength And Ductility With Increasing Reinforcement Content. The Study Provides Valuable Insights Into The Synergistic Effects Of Hybrid Reinforcements And Establishes The Potential Of Al-7075 Hybrid MMCs For Advanced Aerospace And Highperformance Engineering Applications Where High Specific Strength, Wear Resistance, And Multifunctional Properties Are Essential.

Published:

18-4-1-2026

Issue:

Vol. 26 No. 4-1 (2026)

Page Nos:

608-620

Section:

Articles

License:

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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