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Compositions with minimal Gibbs free energy for single-and multi-phase high-entropy alloys (HEAs) containing Ni, Co, Fe, Cr, Cu, Al, Mn, Ti, Zr, V elements are developed using a developed thermodynamic approach. The phase compositions for some equiatomic HEAs are predicted and the influence of various factors on its formation are described. A correlation between theoretical and experimental data is obtained. Criteria for search of HEAs compositions favourable for formation of single-phase and multi-phase solid solutions are formulated.

The common approach for evaluation of stability of multicomponent substitutional solid solutions using thermodynamic, mechanical, and topological parameters of the constituent elements is developed. The high-temperature systems based on refractory elements (W, Ta, Mo, Nb, V, Ti, Zr, Hf, Cr) are investigated using this approach. Optimal compositions for high-entropy alloys are obtained, and influence of various factors in the formation of stable alloys is described. As shown, the most resistant alloys have non-equiatomic element-contents' ratios. The agreement between element distribution in experimental alloys and predicted stable compositions are obtained for the W-Ta-Mo-Nb and W-Ta-Mo-Nb-V systems.

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It is suggested to measure relaxation stresses in amorphous alloys on the basis of diffraction data. Using this procedure, we analysed the elimination of local stresses on low‐temperature annealing of amorphous Pd52Ni32P16. As a result, a three‐dimensional pattern of a stress distribution in raw alloy was obtained, the main feature of which was nanoscale heterogeneities. We found that the value of relaxation energy for Pd52Ni32P16 is 1.49 kJ/mol. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)