Abstract
Heat treatment of cast aluminum alloy parts enables the formation and distribution of nano-sized precipitates through an optimum sequence including solutionizing, quenching, and artificial aging. Quaternary alloys are particularly challenging, and the present study aims to understand and outline the precipitation kinetics in the foundry AlSi7Cu0.5Mg0.3 alloy. Using techniques like differential scanning calorimetry (DSC), transmission electron microscopy (TEM), LKSZ kinetic equations, and microhardness testing, the precipitation kinetics was quantitatively characterized. Activation energies of the phase transformations were extracted using the Kissinger analysis of non-isothermal DSC runs conducted at different stationary heating rates. Finally, a first evaluation of the interfacial mobility of precipitates in this alloy was made using the developed methodology.
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