期刊
ACTA MATERIALIA
卷 155, 期 -, 页码 35-42出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.05.059
关键词
Metallic glass; Aging; Molecular dynamics simulation; Reverse Monte Carlo analysis; X-ray photon correlation spectroscopy
资金
- City University of Hong Kong [7004968]
Supercooled liquids and glasses, due to their intrinsically unstable nature, are known to relax continuously until an equilibrium state is reached. By exploring atomic relaxation, aging and microscopic structure of chemically similar but physically dissimilar metallic glasses, we find that neither the relaxation time nor aging correlate with the free volume or density of the glasses. Furthermore, atomic relaxation time in these metallic glasses does not depend on the microscopic structure of the systems. The activation energy for the diffusion process indicates a completely different microscopic mechanism governing the atomic transport process. Nevertheless, the age-dependent relaxation time surprisingly exhibits a universal time-waiting time-temperature superposition. Our results provide a convincing proof of the universality in the aging of out-of-equilibrium materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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