Study of structure and mechanical properties of cu-femn-ni multicomponent alloys with al and si additions in the as-cast and splat-quenched state

Authors

  • V. F. Bashev Dr. Sc. (Phys.), Prof., Ukraine
  • O. I. Kushnerov Ph.D. (Phys.), Assoc. Prof., Ukraine

Keywords:

high-entropy alloy, splat-quenching, phase composition, structure, microhardness

Abstract

Abstract. Purpose. This work is dedicated to establishing the effects of the composition and the melt cooling rate on microhardness, phase composition and parameters of the fine structure of multicomponent high-entropy alloys (HEA) of Cu-Fe-MnNi system with Al and Si additions in the as-cast and splat-quenched state. Methodology. As-cast alloy samples were obtained by a laboratory Tamman furnace using a copper mold (cooling rate ~ 102 K/s). Quenching from a liquid state was carried out by a known technique of splat-quenching (SQ). Cooling rate estimated by foil thickness was ~ 106 K/s. The X-ray diffraction analysis was carried out with the use of the DRON-2.0 diffractometer.  Microhardness was measured on the PMT-3 microhardnessmeter. Selection of components of the studied HEAs was carried out on the basis of the criteria adopted in the literature for the HEA composition based on a calculation of the entropy and enthalpy of mixing, valence electron concentrations as well as the difference between the atomic radii of the components. Findings. Simple solid solutions with a face-centered cubic structure are obtained in all of the splatquenched alloys. The as-cast alloys also have a simple face-centered cubic structure, with the exception of CuFeMnNiSi0.5, in which the intermetallic phases are found. The values of lattice parameters of the investigated alloys indicate that solid solutions are formed on the base of the γ-Fe lattice, taking into account its higher melting temperature. The positive influence of microstrains level and dislocation density on the microhardness values of alloys are established. The obtained results clearly indicate also a strong dependence between the measured microhardness and content of Si and Al, thus improved mechanical characteristics are obviously ensured by the strong distortion of the crystal lattice due to the differences in atomic radii of elements. Originality. At present work were first obtained and studied HEAs of Al-Cu-Fe-Mn-Ni-Si system in the as-cast and splat-quenched state. These compositions are free of Co and Cr, which are usually used in HEA and favor an increase in their operating characteristics but substantially increase the alloy cost. Practical value. The HEAs possess many attractive properties, such as high hardness, outstanding wear resistance, irradiation resistance, excellent high-temperature strength, good thermal stability, biocompatibility and corrosion resistance.

Author Biographies

V. F. Bashev, Dr. Sc. (Phys.), Prof.

Department of Experimental Physics and Physics of Metals, Oles Honchar Dnipro National University, 72, Gagarin ave., Dnipro, 49010, Ukraine

O. I. Kushnerov, Ph.D. (Phys.), Assoc. Prof.

Department of Experimental Physics and Physics of Metals, Oles Honchar Dnipro National University, 72, Gagarin ave., Dnipro, 49010, Ukraine

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Published

2017-03-28

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Section

Proceedings in memory of Starodubov