OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 3 2025 Results and Discussion Fig. 1, a shows X-ray diffraction (XRD) patterns of the AlCoCrFeNiNb0.25 alloy in the as-cast state and after heat treatment. In the as-cast state, the alloy consists of a primary BCC phase, which represents a disordered solid solution of all components present in the system. The disorder of the solid solution in the primary phase is attributed to the redistribution of components with various atomic radii in the BCC lattice and their segregation into two phases with different parameters. The solid solution disorder manifests in the XRD pattern as splitting of the main BCC peak into two distinct peaks (Fig. 1, b). Furthermore, the XRD pattern exhibits peaks corresponding to the crystal lattice of the Nb-rich Laves phase, which can be identified as (CoCr)Nb with a hexagonal structure, as well as the [001] reflection peak of the B2 phase representing AlNi with a BCC lattice [29, 32]. b Fig. 1. XRD patterns of AlCoCrFeNiNb0.25 alloy in the as-cast state and after heat treatment (a) with enlarged image in the 2θ range of 41–48° (b) а
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