High entropy metallic glasses, what does it mean?

2024/03/29 by G.V. Afonin, Afonin, G. V., J.C. Qiao +11 · 2 citations
Materials Science · Engineering · #Glass properties and applications #Metallic Glasses and Amorphous Alloys #Phase-change materials and chalcogenides

paper · pdf · doi:10.48550/arxiv.2403.20115

Abstract

We performed calorimetric measurements on 30 bulk metallic glasses differing with their mixing entropies DSmix. On this basis, the excess entropies DS and excess enthalpies DH of glasses with respect to their maternal crystalline states are calculated. It is found that the excess entropy DS on the average decreases with increasing mixing entropy DSmix. This means that so-called "high-entropymetallic glasses" (i.e. the glasses having high DSmix) actually constitute glasses with low excess entropy DS. We predict that such glasses should have reduced relaxation ability. We also found that the excess enthalpy DH of glass linearly increases with its excess entropy DS, in line with a general thermodynamic estimate.

Cited by

• Non-isothermal stress relaxation in conventional and high-entropy metallic glasses and its relationship to themixing and excess entropy
• Relationship of structural disorder and stability of supercooled liquid state with glass-forming ability of metallic glasses

Related

• Non-isothermal stress relaxation in conventional and high-entropy metallic glasses and its relationship to themixing and excess entropy
• Effect of the entropy on the shear viscosity of metallic glasses near the glass transition
• Relationship of structural disorder and stability of supercooled liquid state with glass-forming ability of metallic glasses
• The critical role of entropy in glass transition kinetics
• Residual Entropy of Glasses and the Third Law Expression