<p>Phase equilibria in the Fe-rich corner of the quaternary Fe-Al-Ti-C system upon solidification and at 1000&#xa0;°C were studied using differential thermal analysis (DTA), powder x-ray diffraction (XRD), microscopic examination and electron probe microanalysis (EPMA). The partial liquidus and solidus projections and the isothermal section at 1000&#xa0;°C were constructed. The results are presented on the Fe-25Al-Ti-C composition triangle, where the corner Fe-25Al corresponds to the disordered (<i>α</i>Fe) solid solution or its ordered derivatives FeAl or Fe₃Al, depending on the temperature. The boundaries of the primary crystallization regions of the phases, types and coordinates of mono- and bivariant equilibria are determined. The liquidus surface in the studied region is characterized by the regions of primary crystallization of the (<i>α</i>Fe), Fe₂Ti, Fe₃AlC (<i>κ</i>-carbide), TiC and graphite (C) phases. The solidus surface and isothermal section at 1000&#xa0;°C are defined by the co-existence of the TiC phase with all phases of the system forming two three-phase regions, which form by transition (U) type four-phase reactions.</p>