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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Bibliographic Details
Published inScripta materialia Vol. 258; p. 116492
Main Authors Díaz-García, Álvaro, Law, Jia Yan, Moreno-Ramírez, Luis M., Franco, Victorino
Format Journal Article
LanguageEnglish
Published Elsevier Inc 15.03.2025
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ISSN1359-6462
DOI10.1016/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. [Display omitted]
ISSN:1359-6462
DOI:10.1016/j.scriptamat.2024.116492