Stress-relieved Fe-Mn-Ni-Ge-Si high-entropy alloys: A path for enhancing the magnetocaloric response
In this study, we further subject the recently found Fe-Mn-Ni-Ge-Si high-entropy alloys (HEAs) exhibiting first-order thermomagnetic phase transition to designed heat treatments. The results reveal that the standard heat treatments transform the as-cast dual-phase microstructure into a single phase...
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Published in | Scripta materialia Vol. 258; p. 116492 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Inc
15.03.2025
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Subjects | |
Online Access | Get full text |
ISSN | 1359-6462 |
DOI | 10.1016/j.scriptamat.2024.116492 |
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Summary: | In this study, we further subject the recently found Fe-Mn-Ni-Ge-Si high-entropy alloys (HEAs) exhibiting first-order thermomagnetic phase transition to designed heat treatments. The results reveal that the standard heat treatments transform the as-cast dual-phase microstructure into a single phase without influencing the magnetocaloric response or average composition. A crucial observation is the substantial enhancement in magnetocaloric effects and transition temperatures achieved through a low-temperature heat treatment at 673 K, while maintaining the microstructures and compositions of the alloys. The optimized annealed Fe-Mn-Ni-Ge-Si HEA samples show exceptional magnetocaloric effects, surpassing previous studies and positioning them as strong contenders against established conventional high-performing magnetocaloric materials. The changes in magnetic anisotropy distribution are indicative of the stress relaxation induced by low-temperature annealing. This work shows that stress relaxation can have a significant effect on the optimization of magnetocaloric response, even more important than achieving a single phase by annealing at higher temperatures.
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ISSN: | 1359-6462 |
DOI: | 10.1016/j.scriptamat.2024.116492 |