An in-depth investigation of factors responsible for optimal performance in stir-cast Aluminum metal matrix composites
The factors affecting the hardness, compressive strength, ductility, impact strength, wear rate, coefficient of friction, microstructure (uniform distribution of reinforcements), and corrosion rate of different stir-cast aluminum metal matrix composites (AMMCs) produced from aluminum alloys reinforc...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-12-01
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| Series: | Scientific African |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468227624003946 |
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| Summary: | The factors affecting the hardness, compressive strength, ductility, impact strength, wear rate, coefficient of friction, microstructure (uniform distribution of reinforcements), and corrosion rate of different stir-cast aluminum metal matrix composites (AMMCs) produced from aluminum alloys reinforced with varying proportions of carbonized and uncarbonized eggshells, fly ash, red mud, alumina, (Al2O3), iron oxide (Fe3O4), silicon carbide (SiC), boron carbide (B4C), nano zirconia (ZrO2), silicon nitride (Si3N4), graphite, carbon nanotube (CNT), etc. particulates, have been reviewed. Mechanical results showed that increasing the weight percent of the inclusion particles enhanced the hardness, tensile strength and compressive strength of the final aluminum composites. However, the introduction of SiC and graphite in the ratio 3:1 imparted a softening effect to the composites, which reduced the hardness. In all composites, optimal weight percent additions were required for optimal results. The impact strength and ductility were reduced, due to the limiting of the plastic flow of the base matrix by the inclusions, except for the impact strength where aluminum scraps were used as matrix. Also, tribological results for increased reinforcements showed better wear resistance and coefficient of friction due to improved hardness up to an optimal amount. Microstructural results showed that for uniform distribution of reinforcement particles, appropriate wettings of the particles were required to hinder clustering, porosities and other casting defects. Increases in the weight of reinforcements reduced the corrosion rate of the composites but were affected positively and negatively after heat treatment, depending on the type of reinforcements used. |
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| ISSN: | 2468-2276 |