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The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys

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Abstract

This paper explores the FeCoNiCuMn high-entropy alloy system, where small departures from equiatomic composition have yielded technologically interesting 300-K Curie temperatures (\(T_{\mathrm{c}}\)), making them promising for magnetocaloric applications. We also demonstrate that the small deviations from equiatomic compositions do not affect the structural stability of our single-phase fcc-based solid solutions. Room-temperature Mössbauer spectroscopy measurements provide evidence for the distributed exchange interactions (\(J_{\mathrm{ex}}\)) occurring between the magnetic elements, which contribute to a broadened magnetocaloric effect observed for these alloys. The average hyperfine field observed in the Mössbauer spectra decreases as the \(T_{\mathrm{c}}\) of the alloys decrease, confirming direct current magnetic measurements. Multiple peaks in the hyperfine field distribution are interpreted considering pairwise ferromagnetic or antiferromagnetic \(J_{\mathrm{ex}}\) between all elements except the Cu diluent as contributing to overall magnetic exchange in the alloy.

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Acknowledgements

The authors acknowledge support from the National Science Foundation (NSF) through Grant DMR-1709247. The authors also acknowledge use of the Materials Characterization Facility at Carnegie Mellon University supported by Grant MCF-677785. We thank Vladimir Keylin and William Hasley III for sample preparation and assistance.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Carnegie Mellon Univeristy, Pittsburgh, PA, 15213, USA

    Alice Perrin, Mari-Therese Burton, David E. Laughlin & Michael McHenry

  2. Department of Physics, Duquesne University, Pittsburgh, PA, 15282, USA

    Monica Sorescu

Authors
  1. Alice Perrin
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  2. Monica Sorescu
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  3. Mari-Therese Burton
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  4. David E. Laughlin
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  5. Michael McHenry
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Correspondence to Alice Perrin.

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Perrin, A., Sorescu, M., Burton, MT. et al. The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys. JOM 69, 2125–2129 (2017). https://doi.org/10.1007/s11837-017-2523-3

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  • DOI: https://doi.org/10.1007/s11837-017-2523-3

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