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

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2024-09-11 DOI:10.1016/j.intermet.2024.108478

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 (MGs) 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 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 T_g decreases with ΔS_mix. It is concluded that glasses with ‘high mixing entropy’ ΔS_mix correspond to MGs with 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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接近玻璃化转变的金属玻璃的混合熵、过量熵和剪切粘度之间的关系

我们测量了 14 种不同混合熵 ΔSmix 的金属玻璃 (MGs) 的剪切粘度。结果发现，玻璃转化温度 Tg 下的粘度随 ΔSmix 的增加而显著增加。利用量热数据，我们计算了所有 MG 相对于母晶状态的过量熵 ΔS 与温度的函数关系。结果表明，室温下和 Tg 下的过量熵 ΔS 都会随着 ΔSmix 的减小而减小。由此得出结论，具有 "高混合熵 "ΔSmix 的玻璃与具有低过剩熵 ΔS 的 MG 相对应。高ΔSmix玻璃在Tg温度下剪切粘度增加的原因取决于其过量熵ΔS的降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.