Investigation on Effects of Melt Temperature on Solidification Behavior of ‎ in-situ Al-Mg2Si Composite using Cooling Curve Thermal Analysis‎

The in-situ Al-Mg2Si composites have attracted much attention in many important industries such as automotive and aerospace due to their low density, high specific strength, good wear resistance and thermal stability. In this research, solidification characteristics of in-situ Al-20%Mg2Si composites has been investigated using cooling curve thermal analysis technique. For this purpose, the thermal analysis curves of this composite have been plotted at three different temperatures of 750, 800, 850℃ and the effect of superheat on the solidification parameters has been investigated. The results demonstrated that the superheat temperature affect the nucleation and growth of primary Mg2Si phase and the eutectic reaction. Increasing the heat temperature from 750 to 850℃, increases the nucleation temperature of primary Mg2Si, solidification range and decreases the growth temperature of the binary eutectic reactions. The size and aspect ratio of Mg2Si reinforcement phase decreases by increasing the superheat. Therefore, the distribution of these phases will be improved and it will promote better mechanical properties in the composite.