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arXiv · 2311.11263

Effect of the entropy on 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
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Abstract

We measured the shear viscosity of 14 metallic glasses differing with their mixing entropy $ΔS_{mix}$. It is found that the viscosity at the glass transition temperature $T_g$ significantly increases with $ΔS_{mix}$. Using calorimetric data, we calculated the excess entropy of all glasses $ΔS$ 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 $T_g$ \textit{decreases} with $ΔS_{mix}$. It is concluded that glasses with "high mixing entropy" $ΔS_{mix}$ correspond to MGs with \textit{low} excess entropy $ΔS$. The origin of the increased shear viscosity at $T_g$ of glasses with high $ΔS_{mix}$ is determined by their reduced excess entropy $ΔS$.

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A. S. Makarov, J. B. Cui, J. C. Qiao, G. V. Afonin, N. P. Kobelev, V. A. Khonik. 2023-11-19. Effect of the entropy on the shear viscosity of metallic glasses near the glass transition. https://arxiv.org/abs/2311.11263

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