Investigation of out-of-equilibrium thermo-physical properties of AlSi10Mg processed by LPBF through modeling and experiment

The AlSi10Mg processed by the additive manufacturing Laser Powder Bed Fusion (LPBF) exhibits an out of-equilibrium microstructure as a result of rapid solidification inside the melt pool. During the measurement of the thermo-physical properties, the as-built microstructure undergoes a transformation at high temperature accompanying by a change of properties. To address the device limitation over this temperature range, the thermo-physical properties of the as-built AlSi10Mg is investigated through a CALPHAD (CALculation of Phase Diagram) model associated to a non-equilibrium solidification model. The computed thermo-physical properties is in agreement with the experimental one at low temperature where the as-built microstructure is conserved while the models provide extrapolated values at high temperature. The corresponding thermo-physical data can be used as inputs for models of the LPBF process.