高熵金属眼镜,它意味着什么?

G. V. Afonin, J. C. Qiao, A. S. Makarov, R. A. Konchakov, E. V. Goncharova, N. P. Kobelev, V. A. Khonik
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摘要

我们对 30 种不同混合熵 DSmix 的块状金属玻璃进行了量热测量。在此基础上,计算了玻璃相对于母晶状态的过量熵 DS 和过量焓 DH。结果发现,平均过剩熵 DS 随混合熵 DSmix 的增加而减小。这意味着所谓的 "高熵金属玻璃"(即具有高混合熵 DSmix 的玻璃)实际上是由低过剩熵 DS 的玻璃构成的。我们预测这类玻璃的弛豫能力会降低。我们还发现,玻璃的过剩焓DH随过剩熵DS的增加而线性增加,这与一般的热力学估计一致。
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High entropy metallic glasses, what does it mean?
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.
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