Thermally activated deformation of nanocrystalline and coarse grained CoCrFeNiMn high entropy alloy in the temperature range 4.2-350 K

Autor(en)

A. V. Podolskiy, E. Schafler, E. D. Tabachnikova, M. A. Tikhonovsky, M. J. Zehetbauer

Abstrakt

Mechanical properties of a nanocrystalline (∼ 60 nm) and a coarse grained (grain sizes ∼ 4 μm) CoCrFeNiMn high entropy alloys were studied in uniaxial compression in the temperature range 4.2-350 K. Temperature dependences of yield strength, flow stress and strain rate sensitivity have been registered and analyzed in the framework of two thermal activation deformation models, that of thermal activation of local barrier overcoming, and that of Peierls valley double kink formation. Microscopic parameters of dislocation interaction with the barriers for thermally activated motion are estimated and low temperature deformation mechanisms are discussed.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

National Academy of Sciences of Ukraine (NASU), National Science Center Kharkiv Institute of Physics and Technology (KIPT)

Journal

Low Temperature Physics

Band

44

Seiten

976-982

Anzahl der Seiten

7

ISSN

1063-777X

DOI

https://doi.org/10.1063/1.5052688

Publikationsdatum

09-2018

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5a64ac8f-88b6-4f7e-86af-6dbad78d7443