Mechanical, Elastic and Microstructural Investigations on HCP Phase High-Entropy Alloys

Abstract

Hexagonal-structured high-entropy alloys (HEAs) are in use for engineering materials, for critical components in chemical processing, power generation and gas turbine. The present work described how HEAs behave regarding their thermophysical properties and their exceptional elastic and mechanical properties. In the beginning, higher-order elastic constants (HOECs) of the HEAs, namely Cr₁₀Mn₃₀Fe₅₀Co₁₀, Cr₂₀Mn₂₀Fe₃₄Co₂₀Ni₆, Cr₂₀Mn₂₀Fe₃₀Co₂₀Ni₁₀, Cr₂₀Mn₂₀Fe₂₀Co₂₀Ni₂₀ and Cr₂₅Fe₂₅Co₂₅Ni₂₅, in their hcp phase have been computed with the help of simple interaction potential approach. Utilizing HOECs, the elastic moduli, anisotropy factor (f_E), Pugh’s ratio (B/G), Kleinman’s parameter (ζ), Poisson’s ratio (σ), microhardness (H), Vicker’s hardness (H_V), Lame’s constants (λ and µ) and ratio of linear compressibility coefficients (f) have been computed. Later on, the Grüneisen parameter for the shear wave and longitudinal wave of considered HEAs has been calculated utilizing the obtained values of HOECs and lattice parameters. The results of second-order elastic constants were compared with the results obtained from different theories. The obtained results may be further explored for determining the inherent properties of HEAs.