Abstract:

In this study, the impact of copper and silicon contributions on Al-25Zn alloy’s mechanical and processing properties has been experimentally studied. Twin Al-25Zn, triple Al-25Zn-3Cu and fourth Al-25Zn-3Cu-3Si alloys are produced by induction and moisturizing methods and microbuilding and mechanical characteristics are determined. Cutting experiments were carried out using a fixed cutting depth of 1.5 mm with three different cutting speeds (250-350-450 m/min) and progress (0,05-0,1-0,15 mm/dev) with CVD Al2O3 covered equipment in the CNC turning machine. It has been observed that the interior of the Al-25Zn alloy is made up of aluminum-rich α dendrites and zinc-rich interdendritic η phase. With the 3% Cu added to this receipt, it was found that the θ phase was formed in the intermetal α and α+η phase, the 3% Si added to the Al-25Zn-3Cu alloy, the α, α+η, θ phase, as well as ecetic and primary silicon particles were formed. Al-25Zn alloy Cu and Al-25Zn-3Cu alloy with the addition of Si increased hardness, flow and pull resistance, reduced break extension. Processing tests have found that the highest cutting forces are measured in the processing of Al-25Zn-3Cu alloys, while the lowest are Al-25Zn-3Cu. The lowest surface smoothness values were measured at all cutting speeds and at 0.05-0.1 mm/dev progress rates in Al-25Zn alloy and at 0.15 mm/dev progress in Al-25Zn-3Cu alloy. The highest surface smoothness values have been determined at all cutting speeds in the Al-25Zn-3Cu-3Si alloy.

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