Soriano Daniel, Zhou Hongbo, Hilke Sven, Pineda Eloi, Ruta Beatrice, Wilde Gerhard
Escola d'Enginyeria de Barcelona Est, Universitat Politècnica Catalunya-BarcelonaTech, 08019-Barcelona, Spain.
Institute of Materials Physics, University of Muenster, Wilhelm-Klemm Strasse 10, 48149 Muenster, Germany.
J Phys Condens Matter. 2021 Apr 20;33(16). doi: 10.1088/1361-648X/abef27.
The stress relaxation dynamics of metallic glass PdNiPwas studied in both supercooled liquid and glassy states. Time-temperature superposition was found in the metastable liquid, implying an invariant shape of the distribution of times involved in the relaxation. Once in the glass state, the distribution of relaxation times broadens as temperature and fictive temperature decrease, eventually leading to a decoupling of the relaxation in two processes. While the slow one keeps a viscous behavior, the fast one shows an anelastic nature and a time scale similar to that of the collective atomic motion measured by x-ray photon correlation spectroscopy (XPCS). These results suggest that the atomic dynamics of metallic glasses, as determined by XPCS at low temperatures in the glass state, can be related to the rearrangements of particles responsible of the macroscopically reversible anelastic behavior.
研究了金属玻璃PdNiP在过冷液体和玻璃态下的应力松弛动力学。在亚稳液体中发现了时间-温度叠加，这意味着参与弛豫的时间分布形状不变。一旦进入玻璃态，弛豫时间分布会随着温度和虚构温度的降低而变宽，最终导致弛豫在两个过程中解耦。慢过程保持粘性行为，而快过程表现出滞弹性性质和与通过X射线光子相关光谱（XPCS）测量的集体原子运动相似的时间尺度。这些结果表明，在玻璃态低温下由XPCS确定的金属玻璃的原子动力学，可能与宏观可逆滞弹性行为中粒子的重排有关。
