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Decreasing activation energy of fast relaxation processes in a metallic glass during aging

机译：降低金属玻璃在老化过程中快速弛豫过程的活化能

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摘要

Many of the macroscopic properties of a glass are determined by the degree of structural relaxation. When the nonequilibrium system ages toward a thermodynamically more favorable state, the accompanying densification leads to an increase of the activation energies found for the alpha and especially the beta relaxation processes. In this work we experimentally quantify the low-energy mechanical relaxation spectrum of a metallic glass at cryogenic temperatures, and show that these relaxation processes intriguingly show the opposite trend. The energy scale as well as the relaxation strength decrease during the aging process below the glass transition temperature with a surprisingly strong dependence on the annealing time. The experimental results are analyzed in the framework of established models and the temporal behavior of the typical energy V-0 is assessed. We compare the derived values to the values of the thermal energy available at the estimated fictive temperature of the given state and find that the absolute values as well as their temporal behavior show a high degree of correlation for the studied metallic glass. The decreasing characteristic energy values found in the present experiment directly depict the evolution of the structure toward a hypothetical lowest entropy state before the glass becomes structurally indistinguishable from a crystalline material.
机译：玻璃的许多宏观性能取决于结构弛豫的程度。当非平衡体系朝着热力学上更有利的状态老化时，伴随的致密化导致α和特别是β弛豫过程中发现的活化能增加。在这项工作中，我们实验性地量化了低温下金属玻璃的低能机械弛豫谱，并表明这些弛豫过程有趣地显示出相反的趋势。在低于玻璃化转变温度的时效过程中，能级以及松弛强度降低，并且退火时间强烈依赖。在已建立的模型框架内分析了实验结果，并评估了典型能量V-0的时间行为。我们将导出的值与给定状态的估计虚拟温度下可用的热能值进行比较，发现对于所研究的金属玻璃，绝对值及其时间行为显示出高度的相关性。在本实验中发现的降低的特征能量值直接描绘出在玻璃与晶体材料在结构上无法区分之前，结构向假设的最低熵态的演变。

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  • 来源
    《Physical review》 |2019年第14期|140202.1-140202.5|共5页
  • 作者

    Luckabauer Martin; Hayashi Tomoki; Kato Hidemi; Ichitsubo Tetsu;

  • 作者单位

    Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan;

    Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan;

    Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan;

    Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan;

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