STRUCTURE AND CORROSION-ELECTROCHEMICAL PROPERTIES OF Fe-BASED CAST HIGH-ENTROPY ALLOYS

Authors

  • Volodymyr A. Polonskyy Oles Honchar Dnipro National University, Ukraine
  • Valeriі F. Bashev Oles Honchar Dnipro National University, Ukraine
  • Oleksandr I. Kushnerov Oles Honchar Dnipro National University, Ukraine

DOI:

https://doi.org/10.15421/082019

Keywords:

high-entropy alloys, structure, phase composition, electrochemical properties, corrosion resistance, microstructure.

Abstract

The structure, electrochemical behavior, and corrosion resistance of samples of cast high-entropy alloys systems Fe – Cr – Cu – Ni – Mn – Si and Fe – Co – Cu – Ni – Mn – Si in a neutral solution of sodium chloride were studied. Selection of components of the studied alloys was carried out on the basis of the criteria adopted in the literature for the high-entropy alloys composition based on calculation of the entropy and enthalpy of mixing, valence electron concentrations as well as the difference between the atomic radii of the components. Using X-ray diffraction analysis, the phase composition and crystal lattice parameters of the investigated high-entropy alloys were determined. It was established that the Fe5CоCuNiMnSi alloy is a solid solution with a face-centered cubic lattice, while the Fe5CrCuNiMnSi alloy contains two solid solutions with a face-centered and solid solution with body-centered cubic lattices. The values of stationary potentials and areas of electrochemical stability of alloys, as well as the density of corrosion currents, are determined. It has been shown that samples of the Fe5CrCuNiMnSi alloy behave inertly in corrosion tests.

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Published

2020-10-13

Issue

Vol. 28 No. 2 (2020): Journal of Chemistry and Technologies

Section

Chemical Technology

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