Fizika Nizkikh Temperatur: Volume 43, Number 9 (September 2017), p. 1381-1395    ( to contents , go back )

Mechanical properties of high-entropy alloy Al0.5CoCrCuFeNi in the different structural state in the temperature range 0.5–300 K

E.D. Tabachnikova, M.A. Laktionova, Yu.A. Semerenko, S.E. Shumilin, A.V. Podolskiy

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: tabachnikovae@yahoo.com

M.A. Tikhonovsky

National Science Center “Kharkov Institute of Physics and Technology” 1 Akademicheskaya Str., Kharkov 61108, Ukrain

J. Miskuf, and K. Csach

Институт экспериментальной физики САН, ул. Ватсонова, 47, г. Кошице, 043 53, Словакия

Received November 30, 2016, revised January 23, 2017

Abstract

In the temperature range 0.5–300 K the mechanical properties and fracture characteristics of the high-entropy alloy Al0.5CoCrCuFeNi were studied for different structural states (as cast and after two heat treatments). The temperature dependences of Young’s modulus for different structural states were measured by mechanical resonance spectroscopy. It was found that heat treatment of the samples leads to an increase (~ 25%) of the Young’s modulus, the conditional yield stress τ0.2, and the deforming stress. The form of de-formation curves is analyzed. Thermoactivation analy-sis of experimental data made it possible to obtain em-pirical estimates of the parameters of the interaction of dislocations with local barriers.

PACS: 62.20.–x Mechanical properties of solids;
PACS: 61.72.Hh Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.);
PACS: 81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization;
PACS: 81.40.Lm Deformation, plasticity, and creep.

Key words: low temperatures, dislocations, thermo-activation analysis, internal friction.

Published online: July 25, 2017

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