Funct. Mater. 2025; 32 (3): 418-422.

The structure and physical properties of the high-entropy multicomponent alloy FeCoNiB_0.7Si_0.3Be in the as-cast and melt-quenched states were studied. The cooling rate of the melt-quenched films was estimated to be ~ 10⁶ K/s based on the film thickness. X-ray analysis revealed a multiphase structure, including a BCC-type ordered phase (structural type B2) and intermetallic compounds (Fe, Ni, Co)₂B. In melt-quenched samples, the fraction of the B2 phase increased, leading to a decrease in microhardness (from 10400 MPa in as-cast to 8900 MPa in melt-quenched samples). Magnetic studies confirmed the ferromagnetic nature of the FeCoNiB_0.7Si_0.3Be alloy. The coercive field of melt-quenched samples (17500 A/m) was significantly higher than that of the as-cast ones (5200 A/m), which is attributed to structure refinement and the increase in the level of microstresses.