Structure, thermal and electrical properties of Fe-B-Co-Nb-Ni-Si high-entropy metallic glass

  • O. I. Kushnerov Oles Honchar Dnipro National University, Dnipro, Ukraine
  • V. F. Bashev Oles Honchar Dnipro National University, Dnipro, Ukraine
Keywords: high-entropy alloy, metallic glass, structure, phase composition, splat-quenching, differential thermal analysis

Abstract

New nanostructured Fe25B17.5Co21.35Nb3.65Ni25Si7.5 high-entropy metallic glass is synthesized by dint of splat-quenching technique. The estimated cooling rate is ~106 K/s. The coherently scattering domain size (crystallite size) of films of Fe 25B17.5Co21.35Nb3.65Ni25Si7.5 high-entropy metallic glass estimated by the Sherer formula is ~ 3 nm. The high-entropy metallic glass shows a high temperature of glass transition Tg ~ 800 K and the initial temperature of crystallization Tx ~ 863 K. After annealing to ~ 1010 K (above the crystallization temperature) and subsequent slow cooling, the amorphous films crystallize with the formation of several crystalline phases. The temperature dependencies of electrical resistivity of the Fe25B17.5Co21.35Nb3.65Ni25Si7.5 films indicate the occurrence of phase transformations. The phase transformation temperature (temperature of crystallization) is ~ 869 K. This value agrees well with the value obtained from the differential thermal analysis.

Published
2020-09-10
Section
Articles