Funct. Mater. 2021; 28 (3): 492-496.

doi:https://doi.org/10.15407/fm28.03.492

Low temperature elastic properties of Al0.5CoCrCuFeNi high-entropy alloy

O.S.Bulatov, V.S.Klochko, A.V.Korniyets, I.V.Kolodiy, O.O.Kondratov, T.M.Tikhonovska

National Scientific Center "Kharkiv Institute of Physics and Technology", National Academy of Sciences of Ukraine, 1 Academichna Str., 61108 Kharkiv, Ukraine

Abstract: 

The independent c11, c44, and c12 elastic constants of Al0.5CoCrCuFeNi high-entropy alloy with the fcc structure were experimentally determined by the ultrasonic spectroscopy method in temperature region from 77 to 300 K. The results were obtained on samples with an axial [100] and [111] growth textures. Temperature changes in Young modulus, shear modulus, volume modulus, Poisson's ratio, Pugh's index and the elastic anisotropy factor were determined. The Pugh's index values are in the range between 1.26 (77 K) and 1.60 (300 K), which indicates the relatively low alloy ductility at low temperatures. Negative values of the Cauchy pressure c12 - c44 are possibly caused by the influence of a relatively strong directed interatomic bond in a disordered solid solution, which is a high-entropy alloy.

Keywords: 
high-entropy alloy, elastic constants, elastic anisotropy, ultrasonic studies.

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