Publication detail

High entropy alloys (FeCoNi) 0.75 Cr 0.25-x Cu x - thermal stability and physical properties

BROŽ, P. VŘEŠŤÁL, J. SOPOUŠEK, J. WEISS, K. BURŠÍK, J. BURŠÍKOVÁ, V. ZÁDĚRA, A. MÜLLER, P. ČUPERA, J. ROGL, G. PARZER, M. BAUER, E. MICHOR, H. ROGL.P.F.

English title

High entropy alloys (FeCoNi) 0.75 Cr 0.25-x Cu x - thermal stability and physical properties

Type

journal article in Web of Science

Language

en

Original abstract

The paper reports on the phase stability of the (FeCoNi) 0.75 Cr 0.25-x Cu x HEA system with equimolar ratio of Fe, Co and Ni by differential scanning calorimetry (DSC) and measurements of physicochemical properties: density, electrical resistivity, Seebeck coefficient, thermal conductivity, and magnetic behaviour in a broad temperature region as well as hardness and elastic modulus at room temperature as a function of the gradual substitution of chromium by copper in a series of (FeCoNi) 0.75 Cr 0.25-x Cu x alloys with different mole fraction of Cu (x = 0, 0.05, 0.1, 0.15 and 0.2). DSC measurements showed that all alloys are thermally stable. Increasing content of Cu was found (i) to increase the formation of a fcc Cu-rich phase, (ii) to strengthen ferromagnetic interactions, resulting in rising ordered magnetic moments, as well as in growing ferromagnetic transition temperatures, and (iii) to distinctly change physical properties like electrical resistivity, thermal expansion, and mechanical properties. Experimental data regarding the phase stability are supported by CALPHAD calculations.

English abstract

The paper reports on the phase stability of the (FeCoNi) 0.75 Cr 0.25-x Cu x HEA system with equimolar ratio of Fe, Co and Ni by differential scanning calorimetry (DSC) and measurements of physicochemical properties: density, electrical resistivity, Seebeck coefficient, thermal conductivity, and magnetic behaviour in a broad temperature region as well as hardness and elastic modulus at room temperature as a function of the gradual substitution of chromium by copper in a series of (FeCoNi) 0.75 Cr 0.25-x Cu x alloys with different mole fraction of Cu (x = 0, 0.05, 0.1, 0.15 and 0.2). DSC measurements showed that all alloys are thermally stable. Increasing content of Cu was found (i) to increase the formation of a fcc Cu-rich phase, (ii) to strengthen ferromagnetic interactions, resulting in rising ordered magnetic moments, as well as in growing ferromagnetic transition temperatures, and (iii) to distinctly change physical properties like electrical resistivity, thermal expansion, and mechanical properties. Experimental data regarding the phase stability are supported by CALPHAD calculations.

Keywords in English

HEA; Phase equilibria; DSC; Physical properties; Density; Thermal expansion; Hardness

Released

23.04.2024

Publisher

ELSEVIER SCIENCE SA

Location

LAUSANNE

ISSN

0925-8388

Volume

993

Number

July

Pages from–to

1–11

Pages count

11

BIBTEX


@article{BUT189753,
  author="Pavel {Brož} and Jan {Vřešťál} and Jiří {Sopoušek} and Vilma {Buršíková} and Antonín {Záděra} and Peter {Müller} and Jan {Čupera},
  title="High entropy alloys (FeCoNi) 0.75 Cr 0.25-x Cu x – thermal stability and physical properties",
  year="2024",
  volume="993",
  number="July",
  month="April",
  pages="1--11",
  publisher="ELSEVIER SCIENCE SA",
  address="LAUSANNE",
  issn="0925-8388"
}