Although magnesium alloys possess a high strength-to-weight ratio and find expanding applications in automotive, aviation, and aerospace, their reactivity with oxygen lading in specific cases to the ignition brings some limiting factors. In this regard, we have suggested and produced magnesium-based alloys containing Y, Gd and Ca (namely Mg-2Y-2Gd-1Ca and Mg-4Y-4Gd-1Ca, wt. %). These materials were processed by direct extrusion or equal channel angular pressing (ECAP) to analyse the effect of the microstructure on ignition temperature, mechanical properties, and corrosion resistance. The commercial WE43 alloy was selected as the gold standard for comparing materials' properties. Obtained results indicated that ignition temperature of both these alloys exceeded 950 °C and reached 1091 °C (boiling temperature of Mg) for Mg-4Y-4Gd-1Ca, regardless of the microstructure. Such behaviour was attributed to the highly stable oxide layers on the surface of the material in both the solid and liquid conditions. Thermogravimetry analysis and differential thermal analysis revealed that the onset of the severe oxidation is ≈50 °C below this temperature. The materials reached a high yield strength (> 250 MPa) and acceptable ductility (8-16%), which differed according to the processing conditions (extrusion temperature, extrusion ratio, ECAP temperature and number of passes). No significant effect of processing parameters was observed on corrosion behaviour in 3.5% NaCl solution, although the slightly larger size of the Mg₂Ca phases in extruded materials compared to ECAP products supported slightly more localised corrosion. This research was funded by the Czech Science Foundation (project n. 22-22248S).