High entropy metallic glasses, what does it mean?

We performed calorimetric measurements on 30 bulk metallic glasses, each differing in their mixing entropies Δ S mix. On this basis, the excess entropies Δ S and excess enthalpies Δ H of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy Δ S...

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Veröffentlicht in:Applied physics letters 2024-04, Vol.124 (15)
Hauptverfasser: Afonin, G. V., Qiao, J. C., Makarov, A. S., Konchakov, R. A., Goncharova, E. V., Kobelev, N. P., Khonik, V. A.
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Sprache:eng
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Zusammenfassung:We performed calorimetric measurements on 30 bulk metallic glasses, each differing in their mixing entropies Δ S mix. On this basis, the excess entropies Δ S and excess enthalpies Δ H of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy Δ S on the average decreases with increasing mixing entropy Δ S mix. This means that the so-called “high-entropy metallic glasses” (i.e., the glasses having high Δ S mix) actually constitute glasses with low excess entropy Δ S. We predict that such glasses should have reduced relaxation ability. We also found that the excess enthalpy Δ H of glass linearly increases with its excess entropy Δ S, in line with a general thermodynamic estimate.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0199955