Relationship between the entropy of mixing, excess entropy and the shear viscosity of metallic glasses near the glass transition

A. S. Makarov, J. B. Cui, J. C. Qiao, G. V. Afonin, N. P. Kobelev, V. A. Khonik

Research output: Contribution to journalArticlepeer-review

Abstract

We measured the shear viscosity of 14 metallic glasses (MGs) differing with their mixing entropy ΔSmix. It is found that the viscosity at the glass transition temperature Tg significantly increases with ΔSmix. Using calorimetric data, we calculated the excess entropy ΔS of all MGs with respect to their maternal crystalline states as a function of temperature. It is shown that the excess entropy ΔS both at room temperature and at Tg decreases with ΔSmix. It is concluded that glasses with ‘high mixing entropy’ ΔSmix correspond to MGs with low excess entropy ΔS. The origin of the increased shear viscosity at Tg of glasses with high ΔSmix is determined by their reduced excess entropy ΔS.

Original languageEnglish
Article number108478
JournalIntermetallics
Volume175
DOIs
StatePublished - Dec 2024

Keywords

  • Excess entropy
  • Metallic glasses
  • Mixing entropy
  • Viscosity

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