J. Mater. Sci. Technol. ›› 2022, Vol. 102: 66-71.DOI: 10.1016/j.jmst.2021.06.028

• Research Article • Previous Articles     Next Articles

Achievement of giant cryogenic refrigerant capacity in quinary rare-earths based high-entropy amorphous alloy

Yikun Zhang*(), Jian Zhu, Shuo Li, Jiang Wang Zhongming Ren*()   

  1. State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
  • Received:2021-04-24 Revised:2021-06-09 Accepted:2021-06-21 Published:2022-03-10 Online:2021-08-26
  • Contact: Yikun Zhang,Jiang Wang Zhongming Ren
  • About author:zmren@shu.edu.cn (Z. Ren).
    *E-mail addresses: ykzhang@shu.edu.cn (Y. Zhang),

Abstract:

Magnetic refrigeration (MR) by utilizing the magnetocaloric (MC) effect is recognized as one of the most potential promising solid state environmentally friendly and high efficiency alternative method to the well-used state-of-the-art gas compression cooling technique. In this work, a systematic investigation of quinary equi-atomic rare-earths (RE) based Er20Ho20Gd20Ni20Co20 high-entropy (HE) amorphous alloy in terms of the microstructure, magnetic and magnetocaloric (MC) properties have been reported. The Er20Ho20Gd20Ni20Co20 exhibits promising glass forming ability with an undercooled liquid region of 72 K. Excellent cryogenic MC performances can be found in wide temperature from ~25 and ~75 K, close to H2 and N2 liquefaction, respectively. Apart from the largest magnetic entropy change (-ΔSM) reaches 17.84 J/(kg K) with 0-7 T magnetic field change, corresponding refrigerant capacity (RC) attains a giant value of 1030 J/kg. The promising cryogenic MC performances together with the unique HE amorphous characterizations make the quinary Er20Ho20Gd20Ni20Co20 HE amorphous alloy attractive for cryogenic MR applications.

Key words: HE-amorphous ribbons, Magnetocaloric performances, Rare earths, Magnetic properties, Giant refrigerant capacity