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Microstructural and Mechanical Behaviour of Hybrid Green Al6061 Matrix Composites Reinforced with Graphene and Eggshell Developed via by Friction Stir Additive Manufacturing
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DOI：10.1134/S1067821225600887.png)
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Abstract
En 中文
This study investigated the enhancement of mechanical and physical properties of 6061 aluminum alloy by employing friction stir additive manufacturing (FSAM), producing a multilayer composite reinforced with eggshell and graphene particles. A square high-speed steel tool ensured homogeneous dispersion of these reinforcements in the matrix. By varying reinforcement proportions, the composite attained significant property improvements: hardness increased by 26.7%, tensile strength by 24.2%, and compressive strength by 11% when using 4.0 wt % eggshell and 6.0 wt % graphene. Corrosion testing showed excellent resistance, with a negligible weight loss (0.2 g) after 90 h in NaCl solution-consistent with AA6061's natural high corrosion resistance. The material also demonstrated negligible thermal expansion. Fractographic analysis showed brittle fracture characteristics, likely due to the presence of reinforcement particles, which aligns with stated trends for metal matrix composites. These results reveals FSAM's ability to evenly distribute reinforcements, refine grain structure, and significantly enhance strength, hardness, and corrosion resilience, positioning these composites for advanced engineering applications.
Keywords:
friction stir additive manufacturing
hardness
tensile strength
fractography
microstructure
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