Curie Temperature Engineering in High Entropy Alloys for Magnetocaloric Applications

Michael Kurniawan, Alice Perrin, Patricia Xu, Vladimir Keylin, Michael McHenry

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

High entropy alloys (HEAs) are useful in applications that requir high strength, oxidation resistance, and high temperature stability. Research on HEAs for magnetocaloric applications focuses on increasing the refrigeration constant and controlling the Curie temperature (Tc). Here we investigate the effect of metal additions on exchange interaction distributions in eqiatomic ferromagnetic alloys of Fe, Co, and Ni. The metal additions are (a) noble metals (e.g., Cu, Ag), (b) antiferromagnetic transition metals (e.g., Mn), (c) Stoner-enhanced transition metals (e.g., Pt), and (d) early transition metals (e.g., Mo) that contribute to the virtual bound states. We are able to: 1) stabilize a ferromagnetic face-centered cubic γ-phase with equiatomic compositions in 4-, 5-, and 6-component systems, 2) make slight departures from equiatomic compositions to a chosen alloy to bring its Tc closer to room temperature, and 3) measure the role of alloying on exchange interaction distributions. We present a simple model to predict Tc in HEAs using the Bethe-Slater curve and binary phase diagrams of alloy constituents. Compared to the rare-earth-based magnetocaloric materials, the HEAs investigated here have significantly lower costs.

Original languageEnglish
Article number7515235
JournalIEEE Magnetics Letters
Volume7
DOIs
StatePublished - 2016
Externally publishedYes

Funding

M. Kurniawan and M. E. McHenry acknowledge support from the National Science Foundation (NSF) through Grant DMR #0804020.

Keywords

  • Coupled phenomena
  • Curie temperature
  • high entropy alloys
  • magnetic materials
  • magnetocaloric effect

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