Extended Data Fig. 2: Compilation of experimental and thermodynamic data in the vicinity of the investigated alloys.

a, Experimentally verified phases from the present work as well as from refs. ^12,16. AC indicates dendritic as-cast condition, with the shaded regions bridging the compositions in the dendritic and interdendritic regions. Phases from homogenized or two-phase conditions are also shown with the respective temperatures of the heat treatment. Shaded regions indicate microstructural variations and measurement uncertainties. b, Liquidus projection from Pandat using PanHEA and PanMo. c, Suggestion for the correction of the phase diagram/thermodynamic assessment based on experimental data not considered at present on the stable phases. Neither the databases nor the most up-to-date thermodynamic assessment in ref. ⁵⁹ include the Strukturbericht D8_b σ-(Cr,Mo,Si) phase, first reported by Rudy and Nowotny in 1974 (ref. ¹⁶), which served as the basis of the development in ref. ¹². The successful synthesis of single-phase σ-(Cr,Mo,Si) phase in Cr-32.2Mo-13.5Si from the liquid proves congruent solidification and the according lenticular solidification region of σ-(Cr,Mo,Si) in the liquidus projection in c. The presence of this ternary phase needs to be considered in improved thermodynamic calculations for future guided alloy development.