The effect of Fe content on hot tearing of the high-strength Al-Mg-Si alloy was
systematically investigated. In this study, a thermodynamic calculation software Thermo-Calc was
used to calculate the solidification path under the non-equilibrium condition, and the mechanical
properties of this alloy have also been investigated during solidification using an electromagnetic
induction heating tensile machine. In order to confirm the calculation results of solidification path, a
quenching test also was carried out. By using the Thermo-Calc, the sequence of crystallization,
crystallization temperature of formed phases and their crystallized amount were systematically
investigated for each alloy in which Fe content was changed. Furthermore, by comparing the fracture
surfaces of the tensile testing sample and DC billet, the temperature range of crack initiation of the
alloy was examined. Comparing the temperature range of crack initiation with the crystallization
phase and its crystallization order, Fe content of high-strength Al-Mg-Si alloy influenced hot tearing
significantly owing to the crystallization behavior of α(AlFeMn).