In this work, the high-entropy alloy FexCo6Al3Ni2Si (where x = 5, 6, 8) was obtained by mechanical alloying. The microstructure, phase and granulometric compositions of the obtained powders were studied. The required specific energy dose for the formation of a homogeneous solid solution (D = 30 W⋅h/g) was determined. Using the CALPHAD method, a phase diagram was constructed for the multicomponent system FexCo6Al3Ni2Si. The Fe8Co6Al3Ni2Si alloy powder after mechanical alloying showed a saturation magnetization of 154 emu/g and a coercive force of 53 Oe. Compact samples were obtained from Fe8Co6Al3Ni2Si alloy powder in a spark plasma sintering unit and annealed at temperatures of 900, 950 and 1000 °C. The microstructure and phase composition of the samples after annealing were studied. Tests of the magnetic properties of the samples showed that the saturation magnetization of the samples was from 159 to 168 emu/g, the coercive force was from 8.9 to 29.2 Oe. The compressive strength of the samples was from 2190 to 2680 MPa, and the microhardness was from 681 to 811 HV. © 2025 Elsevier B.V.