Phonon behavior in a random solid solution: a lattice dynamics study on the high-entropy alloy FeCoCrMnNi

Shelby R. Turner, Stéphane Pailhès, Frédéric Bourdarot, Jacques Ollivier, Yvan Sidis, John-Paul Castellan, Jean-Marc Zanotti, Quentin Berrod, Florence Porcher, Alexei Bosak, Michael Feuerbacher, Helmut Schober, Marc Boissieu and Valentina M. Giordano ()
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Shelby R. Turner: Institut Laue-Langevin
Stéphane Pailhès: UMR5306 Université Lyon 1-CNRS, Université de Lyon
Frédéric Bourdarot: Université Grenoble Alpes, CEA, IRIG, MEM, MDN
Jacques Ollivier: Institut Laue-Langevin
Yvan Sidis: Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin
John-Paul Castellan: Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin
Jean-Marc Zanotti: Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin
Quentin Berrod: Université Grenoble Alpes, CEA, CNRS, IRIG-SyMMES
Florence Porcher: Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin
Alexei Bosak: European Synchrotron Radiation Facility
Michael Feuerbacher: Peter Grünberg Institut PGI-5 and ER-C, FZ Jülich GmbH
Helmut Schober: Institut Laue-Langevin
Marc Boissieu: Université Grenoble Alpes, CNRS, Grenoble-INP, SIMaP
Valentina M. Giordano: UMR5306 Université Lyon 1-CNRS, Université de Lyon

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract High-Entropy Alloys (HEAs) are a new family of crystalline random alloys with four or more elements in a simple unit cell, at the forefront of materials research for their exceptional mechanical properties. Their strong chemical disorder leads to mass and force-constant fluctuations which are expected to strongly reduce phonon lifetime, responsible for thermal transport, similarly to glasses. Still, the long range order would associate HEAs to crystals with a complex disordered unit cell. These two families of materials, however, exhibit very different phonon dynamics, still leading to similar thermal properties. The question arises on the positioning of HEAs in this context. Here we present an exhaustive experimental investigation of the lattice dynamics in a HEA, Fe20Co20Cr20Mn20Ni20, using inelastic neutron and X-ray scattering. We demonstrate that HEAs present unique phonon dynamics at the frontier between fully disordered and ordered materials, characterized by long-propagating acoustic phonons in the whole Brillouin zone.

Date: 2022
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DOI: 10.1038/s41467-022-35125-4

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