Comparison of differences between agro-waste sand mold additives effects on the hardness and microstructural views of recycled aluminum alloy cooling in various coolants

This paper described some mechanical properties of aluminum alloy using agro-waste materials such as sawdust, groundnut shell, and eggshell. The sand-casting method was adopted to produce the alloy with 5, 15, 25, and 35% wt. additives. The microstructure of the various samples produced after quenched in water, palm oil, and engine oil was examined while hardness properties were determined. The result obtained shows that hardness values increased with an increase in the addition of sand mold Agro-waste ashes. Samples cast with eggshell ash additive and quenched in water coolant had the highest hardness value of 82.4 at 25% wt. additive when compared with sawdust ash and groundnut shell ash additives. sand-casting enhances the hardness of the specimens and thus, can be used in many engineering applications such as engine blocks and wheels in automotive parts and aerospace components.