Mg2Si is often used to improve creep resistanceCreep resistanceof Mg alloysMagnesium alloys (Mg alloys), as an additive for aluminium alloys, as a negative electrode material in Li-ion batteries or in thermoelectric applications. In the Mg-Si system, Mg2Si forms in an equilibrium exothermic reaction. However, during this reaction, the system is heating up, may overheat within a short time, and may run out of control. We will report on a powder metallurgy-based processingProcessing route where mechanical alloying, pressing, and heat treatmentHeat treatmentss are used to produce Mg2Si in a Mg matrix with different Si contents in a controlled manner. XRD is used to identify phases that form during processing.