Manufacture and characterization of HoErCo medium-entropy alloy microwires with excellent magnetic entropy change

Ying Bao, Hongxian Shen*, Jierong Liang, Hangboce Yin, Ze Li, Yongjiang Huang, Jianfei Sun

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A melt-extracted HoErCo medium-entropy alloy (MEA) with large magnetic entropy change and excellent magnetic refrigerant capacity is successfully designed in this study. The microstructure evolution of these microwires near room temperature is studied by an in-situ high energy synchrotron X-ray diffraction (HEXRD). The wires show typical amorphous characteristics during room temperature to 250 K. For a field change of 5 T, the maximum magnetic entropy change (-ΔSMmax) of the microwires reaches a maximum value of 15.0 J•kg−1 K−1. Magnetization measurements revealed a paramagnetic to ferromagnetic phase transition at TC~16 K. The refrigerant capacity (RC) and relative cooling power (RCP) are 527 J•kg−1 and 600 J•kg−1, respectively. This investigation highlights the potential of HoErCo MEA microwires as promising magnetocaloric effect materials for cryogenic applications of magnetic cooling.

Original languageEnglish
Article number120570
JournalJournal of non-crystalline solids
Volume556
ISSN0022-3093
DOIs
Publication statusPublished - 2021

Keywords

  • Amorphous
  • High energy X-ray diffraction
  • Magnetocaloric effect
  • Medium-entropy alloy
  • Melt-extracted
  • Microwires

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