Issues $\rightarrow$ Volume 26, Issue 4 (2025)

Obtaining High-Entropy Alloys by the Laser Alloying Method: Experimental Results and Theoretical Calculations

GIRZHON V.V.$^{1}$ and YEMELIANCHENKO V.V.$^{2}$

$^1$National University ‘Zaporizhzhia Polytechnic’, 64 Zhukovs’ky Str., UA-69063, Zaporizhzhia, Ukraine
$^2$Scientific Lyceum of the Municipal Institution of Higher Education ‘Khortytsia National Educational and Rehabilitational Academy’ of Zaporizhzhia Regional Council, 59 Naukove Mistechko Str., UA-69017 Zaporizhzhia, Ukraine

Received / Final version: 11.03.2025 / 22.10.2025 Download PDF logo PDF

Abstract
The structural-phase state of high-entropy alloys in the Co–Cr–Fe–Ni, Al–Co–Cr–Fe–Ni, and Al–Co–Cr–Cu–Fe–Ni systems obtained by laser alloying of the surface layers of technically pure iron and aluminium with equiatomic mixtures of various combinations of Fe, Co, Cr, Ni, and Cu powders, are studied using XRD, EDX, and metallographic analysis methods. As shown, during laser alloying, the formation of dispersed multicomponent substitutional solid solutions based on b.c.c. and f.c.c. lattices is occurred in the surface layers, significantly increasing the microhardness of the alloyed surfaces. A theoretical model is developed that considers the real cooling conditions and the heterogeneous nature of the nucleation and crystallization processes. The intervals of melt cooling rates, in which the formation of single-phase b.c.c. (B2) or two-phase (b.c.c. (B2) + f.c.c.) alloys occur, are estimated. The influence of chemical composition on these cooling rates is analysed. The correlation between the density of heterogeneous crystallization centres and the volume fraction of the f.c.c. phase is established. The obtained results are of practical significance for creating coatings with improved mechanical properties suitable for use in extreme conditions.

Keywords: high-entropy alloys, laser alloying, rapid solidification, phase composition, microhardness.

DOI: https://doi.org/10.15407/ufm.26.04.***

Citation: V.V. Girzhon and V.V. Yemelianchenko, Obtaining High-Entropy Alloys by the Laser Alloying Method: Experimental Results and Theoretical Calculations, Progress in Physics of Metals, 26, No. 4: ***–*** (2025)

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