arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2503.04443cond-mat.dis-nn
收藏

深度弛豫后金属玻璃中玻璃化转变的本质

On the nature of the glass transition in metallic glasses after deep relaxation

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

AI总结:

本文通过平行研究深度弛豫后Zr基金属玻璃的量热与高频剪切模量行为,提出以高频剪切模量控制玻璃弛豫的理论,发现其过剩热容实验与计算数据高度一致,并论证该转变接近一级相变。

摘要:

我们对在玻璃化转变温度略下方发生深度弛豫后的Zr基金属玻璃,进行了量热与高频剪切模量行为的平行研究。结果表明,深度弛豫导致过剩热容出现一个强峰,而剪切模量仅受到适度影响。我们提出了一种理论,假设高频剪切模量是控制玻璃弛豫的主要物理参数。这些重排的能量势垒与剪切模量成正比,而其大小反过来又因缺陷浓度的变化而发生改变(双弹性效应)。这两种依赖关系共同导致了热效应的产生。使用实验剪切模量数据计算得出的过剩热容,与所有玻璃状态的实验量热数据均表现出极好的一致性。研究论证指出,深度弛豫后玻璃的玻璃化转变行为接近于一级相变。

英文摘要:

We performed parallel study of calorimetric and high-frequency shear modulus behavior of Zr-based metallic glasses after deep relaxation just below the glass transition. It is shown that deep relaxation results in the appearance of a strong peak of the excess heat capacity while the shear modulus is moderately affected. A theory assuming high-frequency shear modulus to be a major physical parameter controlling glass relaxation is suggested. The energy barrier for these rearrangements is proportional to the shear modulus while its magnitude, in turn, varies due to the changes in the defect concentration (diaelastic effect). Both dependences lead to the occurrence of heat effects. The excess heat capacity calculated using experimental shear modulus data demonstrates very good agreement with the experimental calorimetric data for all states of glasses. It is argued that the glass transition behavior after deep relaxation of glass is close to a phase transition of the first kind.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑