期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 590, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2022.121699
关键词
Glass -forming liquids; Caged dynamics; Microstructure; Interatomic interactions
资金
- Natural Science Foundation for Excellent Young Scholars of Hebei Province [E2021203050]
- Hundred-Talent Program of Hebei Province [E2020050018]
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology [P2022-016]
- National Natural Science Foundation of China [51801174, 51871193]
- Hebei Key Lab for Optimizing Metal Product Technology and Performance
- National Key R&D Program of China [2018YFA0703602]
The study reveals the existence of unusual caged dynamics in metallic glass-forming liquids with strong atomic interactions. The mechanism of caged dynamics is found to be related to chemical order, Voronoi polyhedra, and covalent-like bonds.
The caged dynamics appears at time shorter than the fl -relaxation but longer than the boson peak. Due to the limitations of experimental conditions, the mechanism of caged dynamics is not well studied in metallic glasses. We study a model La65Al(35) glass-forming liquid with strong atomic interactions that presents an unusual caged dynamics, and the La65Ni35 GF liquid is also studied to clarify the underlying mechanisms of caged dynamics. There is a sudden drop near 0.1 ps in the partial non-Gaussian parameter of Al atoms, reflecting the development of caging of the Al atoms with time. A similar feature is also found in Ni80P20, Sm80Al20, Pd80Si20, and Y80Mg20 metallic GF liquids. The chemical order, Voronoi polyhedra, and covalent-like bonds are all related to the cage-breaking behavior of the central atoms, in turn regulating the unusual caged dynamics. These findings shed light on the complex relaxation dynamics of GF liquids.
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