Fizika Nizkikh Temperatur: Volume 46, Number 9 (September 2020), p. 1131-1141    ( to contents , go back )

Low-temperature mechanical properties and thermally activated plasticity parameters of the CrMnFeCoNi2Cu high entropy alloy

E. D. Tabachnikova, Yu. O. Shapovalov, S. N. Smirnov

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
E-mail: tabachnikova@ilt.kharkov.ua

V. F. Gorban’, N. A. Krapivka, and S. A. Firstov

I. Frantsevich Institute for Problems of Materials Science NAS of Ukraine, Krzhizhanovsky str., 3,Kyiv, 03142, Ukraine

Received March 23, 2020, published online July 22, 2020

Abstract

Mechanical properties of the CrMnFeCoNi2Cu high entropy fcc alloy have been studied in a wide range of low temperatures (4.2–350 K). Values of microhardness and Young’s modulus at 300 K have been measured for two structural states. Temperature dependencies of the yield strength, deforming stress, and strain rate sensitivity have been obtained. It was established that in all the temperature range high strength state is realizing with significant plasticity remained. Empirical estimates have been made of the microscopical parameters of plasticity and internal stresses values in the framework of thermally activated deformation models.

Key words: high entropy alloy, thermally activated plasticity, yield strength, low-temperature deformation, thermal activation analysis.

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