Effect of AL2O3CNT in dendrite refinement and mechanical properties of hybrid nanocomposite

Mohd Sukri, Nur Hidayah (2024) Effect of AL2O3CNT in dendrite refinement and mechanical properties of hybrid nanocomposite. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

This research was carried out to investigate the microstructural characterization and mechanical properties of permanent mold casting processed carbon nanotube- aluminium composite. Using the casting to create carbon nanotube-aluminum composites, carbon nanotubes will be employed as reinforcing material and their amounts will vary between 0.2 and 1.0 weight percent. For complex designs and large scale manufacturing, the liquid metallurgical approach for the synthesis of the multiwalled carbon nanotube–A356 aluminium alloy (MWCNT–A356) composite was appropriate. Aluminium metal matrix composites, or AMMCs, have become more widely used in the aerospace, automotive, and defence industries due to their many uses. However, the transportation industry has benefited most from AMMCs because they reduce structural weight, which lowers fuel consumption,costs and airborne pollutants. The permanent mold casting process was used to prepare AMMC because it highly accurate and give better surface finish than other preparation methods. However, because aluminium has a low wet ability, the difficulty lies in achieving a homogenous combination of carbon nanoparticles as reinforcement and aluminium as the matrix. Therefore, employing a robust design of experiment (DOE), specifically, Taguchi technique, with two factorial levels, the optimisation and impact of variables such as quantity of carbon nanotube (CNT) and percentage alumina weight was explored. Field Emission Scanning Electron Microscopy (FESEM) was used to investigate the microstructure and fracture surface of the composites. At different percentages of CNT nanoparticles, evaluation of the mechanical characteristics such as elongation, yield strength, and ultimate tensile strength were successfully obtained. Since there was a noticeable improvement in the mechanical characteristics as the percentages of CNT nanoparticles grew, it was discovered that the concentrations of the reinforced CNT nanoparticle had a significant impact on AMMC's mechanical qualities. The uniform distribution of the reinforcing nanoparticles and the little porosity of the aluminium matrix's grain refinement were credited with this increase in the mechanical characteristics. The findings demonstrated that the A356's dendritic structure has been lost and replaced with a more refined structure. Results indicated that the mechanical properties of the aluminium (Al) matrix composites (AMCs) was significantly improved after the reinforcement with alumina and CNT. This work demonstrated the enhanced mechanical properties achieved.

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