Beyond Solid Solution High-Entropy Alloys: Tailoring Magnetic Properties via Spinodal Decomposition

Ziyuan Rao, Biswanath Dutta, Fritz Körmann, Wenjun Lu, Xuyang Zhou, Chang Liu, Alisson Kwiatkowski da Silva, Ulf Wiedwald, Marina Spasova, Michael Farle, Dirk Ponge, Baptiste Gault, Jörg Neugebauer, Dierk Raabe, Zhiming Li

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
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Abstract

Since its first emergence in 2004, the high-entropy alloy (HEA) concept has aimed at stabilizing single- or dual-phase multi-element solid solutions through high mixing entropy. Here, this strategy is changed and renders such massive solid solutions metastable, to trigger spinodal decomposition for improving the alloys’ magnetic properties. The motivation for starting from a HEA for this approach is to provide the chemical degrees of freedom required to tailor spinodal behavior using multiple components. The key idea is to form Fe-Co enriched regions which have an expanded volume (relative to unconstrained Fe-Co), due to coherency constraints imposed by the surrounding HEA matrix. As demonstrated by theory and experiments, this leads to improved magnetic properties of the decomposed alloy relative to the original solid solution matrix. In a prototype magnetic FeCoNiMnCu HEA, it is shown that the modulated structures, achieved by spinodal decomposition, lead to an increase of the Curie temperature by 48% and a simultaneous increase of magnetization by 70% at ambient temperature as compared to the homogenized single-phase reference alloy. The findings thus open a pathway for the development of advanced functional HEAs.

Original languageEnglish
Article number2007668
Number of pages9
JournalAdvanced Functional Materials
Volume31
Issue number7
DOIs
Publication statusPublished - 2021

Keywords

  • coherency constraints
  • density functional theory
  • high-entropy alloys
  • magnetic properties
  • spinodal decomposition

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