金属玻璃在静水压缩下的α松弛与平衡关系的破裂
Break-down of the relationship between α-relaxation and equilibration in hydrostatically compressed metallic glasses
AI总结：
静水压缩改变了金属玻璃的动态、热力学和结构，揭示了α松弛之外的额外过程对平衡恢复的作用。
摘要：
玻璃能够记录任何施加于它们的热机械处理的记忆。这种能力与存在多种亚稳无定形态态有关，可以通过不同的实验途径进行探测。通常认为这种记忆可以在过冷液体中被擦除，且这一过程的时间尺度由α松弛控制。我们发现这一假设不适用于静水压缩的玻璃。在压力下退火典型的金属玻璃可以不可逆地改变其动力学、热力学和结构，降低原子迁移率，并导致第一配位壳层的结构变化，从而降低其相对于无压力退火玻璃的热稳定性。当这些压缩玻璃被加热到其玻璃转变温度以上时，它们不转化为原始的过冷液体，表明存在一个额外的过程，超越α松弛，对材料的平衡恢复起作用。这些结果证明压力是工程非平衡玻璃材料的强大工具，同时加深了我们对极端条件下无序系统松弛动力学的理解。
英文摘要：
Glasses encode the memory of any thermo-mechanical treatment applied to them. This ability is associated to the existence of a myriad of metastable amorphous states which can be probed through different experimental pathways. It is usually assumed that this memory can be erased in the supercooled liquid, and that this process occurs on a time scale controlled by the α-relaxation. We find that this assumption does not apply for hydrostatically compressed glasses. Annealing under pressure a prototypical metallic glass can irreversibly modify its dynamics, thermodynamics and structure, reduce the atomic mobility and lead to structural modifications of the first coordination shells which reduce the thermal stability with respect to a glass annealed in absence of pressure. When heated above their glass transition temperature, these compressed glasses do not convert into the pristine supercooled liquid, implying the existence of an additional process, beyond the α-relaxation, contributing to the equilibrium recovery of the material. These results establish pressure as a powerful tool for engineering non-equilibrium glassy materials with tailored properties, while deepening our understanding of relaxation dynamics in disordered systems under extreme conditions.
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