The relaxation spectrum of glassy solids has long been used to probe their dynamic structural features and the fundamental deformation mechanisms. Structurally complicated glasses, such as molecular glasses, often exhibit multiple relaxation processes. By comparison, metallic glasses have a simple atomic structure with dense atomic packing, and their relaxation spectra were commonly found to be simpler than those of molecular glasses. Here we show the compelling evidence obtained across a wide range of temperatures and frequencies from a La-based metallic glass, which clearly shows two peaks of secondary relaxations (fast versus slow) in addition to the primary relaxation peak. The discovery of the unusual fast secondary relaxation unveils the complicated relaxation dynamics in metallic glasses and, more importantly, provides us the clues which help decode the structural features serving as the 'trigger' of inelasticity on mechanical agitations.

中文翻译：

---

金属玻璃中异常快速的二次松弛。

玻璃态固体的弛豫谱长期以来一直被用来探测其动态结构特征和基本的变形机理。结构复杂的玻璃，例如分子玻璃，通常表现出多重弛豫过程。相比之下，金属玻璃具有原子密集的简单原子结构，通常发现其弛豫谱比分子玻璃更简单。在这里，我们显示了从La基金属玻璃在很宽的温度和频率范围内获得的令人信服的证据，除了主要的弛豫峰外，该玻璃还清晰地显示了两个第二个弛豫峰（快速与慢速）。不寻常的快速二次弛豫的发现揭示了金属玻璃中复杂的弛豫动力学，更重要的是，