Understanding the unusual-caged dynamics from the microstructure and interatomic interactions in binary metallic glass-forming liquids
Source abstract
Abstract
The caged dynamics appears at time shorter than the β-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 La 65Al 35 glass-forming liquid with strong atomic interactions that presents an unusual caged dynamics, and the La 65Ni 35 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 Ni 80P 20, Sm 80Al 20, Pd 80Si 20, and Y 80Mg 20 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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Research context
OpenAlex topics: Material Dynamics and Properties · Metallic Glasses and Amorphous Alloys · Glass properties and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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