MnFeNiGeSi high-entropy alloy with large magnetocaloric effect

Jia Yan Law, Luis M. Moreno-Ramírez, Álvaro Díaz-García, Andrés Martín-Cid, Shintaro Kobayashi, Shogo Kawaguchi, Tetsuya Nakamura, Victorino Franco

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The magnetocaloric effect of high-entropy alloys (HEAs) due to a second-order phase transition exhibits limited response. A significant improvement is obtained in Mn22.3Fe22.2Ni22.2Ge16.65Si16.65 HEA as it exhibits a magneto-structural first-order phase transition. Its isothermal entropy change of 7.3 J kg−1K−1 (for 2.5 T) is the largest reported to date for rare earth-free HEAs. The alloy composition was found by a directed search that starts from a medium entropy alloy with the desired transformation combined with isostructural substitutions. Our findings demonstrate the existence of HEA with magneto-structural phase transition and that HEAs have promising potential as high-performance magnetocaloric materials.

Original languageEnglish
Article number157424
JournalJournal of Alloys and Compounds
Volume855
DOIs
Publication statusPublished - 2021 Feb 25
Externally publishedYes

Keywords

  • First-order phase transition
  • Functional properties
  • High-entropy alloys
  • Magneto-structural transformations
  • Magnetocaloric effect

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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