Large Refrigerant Capacity Induced by Table‐Like Magnetocaloric Effect in High‐Entropy Alloys TbDyHoEr

• Published in: Advanced engineering materials Vol. 25; no. 11
• Main Authors: Zhu, Wei Hao, Ma, Lei, He, Mu Fen, Li, Zhi Kun, Zhang, Huan Zhi, Yao, Qing Rong, Rao, Guang Hui, Su, Kun Peng, Zhong, Xi Chun, Liu, Zhong Wu, Gao, Xin Qiang
• Format: Journal Article
• Language: English
• Published: 01.06.2023
• Subjects: high-entropy alloys; large refrigerant capacity; magnetic properties; magnetic-phase diagram; table-like magnetocaloric effect
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.202201770

Rare‐earth‐based high‐entropy alloys (HEAs) with large magnetocaloric effect (MCE) have been recently recognized as good candidates for magnetic refrigeration. Herein, the complex magnetic transition, MCE, refrigerant capacity (RC), and magnetic‐phase diagram of single‐phase TbDyHoEr HEA are studied. It is showed in the results that due to complex magnetic transition and an ideal table‐like MCE, the RC of TbDyHoEr is significantly improved from 883.19 to 1049.22 J kg−1 by melt‐spun treatment. In terms of RC value and hysteresis performance, the melt‐spun treatment significantly improves the application potential of TbDyHoEr HEA as a high‐efficient magnetic refrigeration material, and the ideal table‐like MCE in a large temperature range enables this material to meet the requirements of both cryogenic refrigeration and mesothermal refrigeration for an Ericsson cycle. Herein, rare‐earth TbDyHoEr high‐entropy alloy (HEA) shows a table‐like magnetocaloric effect and large refrigerant capacity of 1049.22 J kg−1. By melt‐spun treatment, the working temperature range of TbDyHoEr ribbon is widened to 160 K. Complex magnetic transition of antiferromagnetic (AFM), ferromagnetic (FM), spin glass (SG), and paramagnetic (PM) is found and illustrated by plotting the magnetic‐phase diagram.