Study of the Change in the Structure and Properties of High-Entropic Alloys during Thermal and Thermomechanical Processing

G. R. Aripov, A. I. Bazlov, A. Yu Churyumov, V. I. Polkin, D. V. Luzgin, S. D. Prokoshkin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Abstract: Multicomponent alloys without a base element, also known as highly entropic alloys (HEAs), are of great interest for research. The microstructure of the Fe20Ni20Co20Cu20Al20 alloy in a cast, annealed, and deformed state, as well as its mechanical properties and hot deformation ability, is investigated in this article. This alloy is a typical representative of the high-entropy alloy family. Samples are melted in a vacuum induction furnace in an argon atmosphere and then cast into a copper mold. Differential scanning calorimetry results are used to determine the solidus temperature. The homogenization annealing of cast samples is carried out in a high-temperature furnace in air. The microstructure of the alloy is studied by scanning electron microscopy and X-ray diffraction. X-ray microanalysis using X-ray energy dispersive spectroscopy is used to determine the chemical composition of the phases. It is shown that crystallization results in the formation of three solid solutions with one bcc and two fcc crystalline structures. The mechanical properties are investigated under uniaxial compression. Hardness is also measured. The deformation tests are carried out on a DIL805A/D quenching-deformation dilatometer and a Gleeble System 3800 complex for physical modeling and dynamic thermomechanical testing at temperatures of 900–1100°С and strain rates of 0.01–1.0 s–1 for a true degree of deformation of up to 1. Optimum modes of homogenization annealing for the typical representative of HEAs and optimal deformation modes are selected to obtain high mechanical properties.

Original languageEnglish
Pages (from-to)413-420
Number of pages8
JournalRussian Journal of Non-Ferrous Metals
Volume61
Issue number4
DOIs
Publication statusPublished - 2020 Jul 1
Externally publishedYes

Keywords

  • alloys without a base component
  • aluminum alloy
  • anisotropy
  • annealing
  • chemical analysis
  • ductility
  • hardness
  • heat treatment
  • high-entropy alloys
  • homogenization annealing
  • ingots
  • mechanical properties
  • microstructure
  • rolling
  • strength
  • thermal deformation processing

ASJC Scopus subject areas

  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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