Microstructure and magnetocaloric properties of melt‐extracted SmGdDyCoAl high‐entropy amorphous microwires
Shijie Wei, Hongxian Shen, Lunyong Zhang, Lin Luo, Xin-Xing Tang, Jianfei Sun, Xiaoqing Li
Abstract
Abstract This paper presents a systematic investigation of the microstructure and magnetocaloric properties of melt‐extracted Sm 20 Gd 20 Dy 20 Co 20 Al 20 high‐entropy microwires. The fabricated wires exhibited an amorphous structure, and the temperature interval of the undercooled liquid Δ T was 45 K. The microwires underwent a second‐order magnetic transition from a ferromagnetic to a paramagnetic state near the Curie temperature ( T C = 52 K). The maximum magnetic entropy change (), the relative cooling power and the refrigeration capacity reached 6.34 J·kg −1 ·K −1 , 422.09 J·kg −1 and 332.94 J·kg −1 , respectively, under a magnetic field change of 5 T. In addition, the temperature‐averaged entropy changes with two temperature lifts (3 and 10 K) were 6.32 and 6.27 J·kg −1 ·K −1 , respectively. The good magnetocaloric performance highlights the significant potential for the Sm 20 Gd 20 Dy 20 Co 20 Al 20 microwires to be used as magnetic refrigerant materials in low‐temperature region applications. This work will serve as a valuable reference for future investigations on low‐temperature high‐entropy magnetocaloric materials.