A Preliminary Study of the Phase Transformations in Rolled Al-Fe-Si Alloy

The precipitation of phases in the Al-Fe-Si system has been studied using differential scanning calorimetry (DSC) and thermoelectric power (Delta S) in homogenized and deformed by rolling samples. Two predominant associated effects being observed on homogenized samples: the first one, after precipitation of Fe and Si at temperatures lower than 673 K (400 A degrees C) and the second, the Al(3)Fe phase, at a temperature close to 773 K (500 A degrees C). In DSC, the effect of severe deformation by rolling is manifest in two ways: (1) displacing the peaks reported in homogenized samples and (2) introducing two new exothermic transformations associated with the processes of recovery and recrystallization. In Delta S, the two transformations are maintained, although displaced and magnified by the effect of a faster and more abundant Fe precipitation. The isoconversional method is used to calculate the activation of precipitated phases.