Aluminium is the second most important metal, following iron. It has low density, good mechanical properties, high ductility, good corrosion resistance and good heat and electrical resistance. Primarily aluminum is produced by electrolityc reduction. Electrolityc reduction is an energy-intensive process. Recycling and reuse of aluminum and its alloys is perfect, and with low energy consumption. Recycled aluminum has the same good properties as the primary one. Aluminium alloys of the group 6xxx, which are considered to be relatively hard, has good corrosion resistance, can be thermally processed and can be used in multitude of different applications.
The purpose of the diploma work is to study the influence of secondary aluminium's quantity on the course of the solidification of alloy AA6082. The experiment will include five different samples i.e. 0, 25, 50, 75 and 100 wt. % secondary aluminium alloy AA6082. We melted the alloy with an induction furnace and poured it inside a simple thermal analysis' measuring container. From the cooling curves we followed the curing process. The refined alloy was then closely studied with an X-ray fluorescence analysis (XRF), a differential scanning calorimetry (DSC) and thermodynamic calculation.
After completing the experiments we compared the cooling curves of individual alloys, the heating and cooling curves of the DSC analysis and the results of the X-ray fluorescence analysis. The results showed that the 25 wt. % of secondary material sample had the highest coagulation rate, while the 100 wt. % had the slowest coagulation rate. We also discovered that the the most melting enthalpy was used by the 100 wt. % of the primary material.
|
