Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 578, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2021.121345
Keywords
Metallic glass; Molecular dynamics (MD) simulations; Mechanical heterogeneity; Structural heterogeneity
Funding
- National Natural Science Foundation of China [U1930402]
- Beijing Computational Science Research Center
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We found a direct link between the mechanical heterogeneity and local structural response of metallic glasses, revealing that the mechanical heterogeneity is not only related to static atomic packing but also to the dynamic evolution of the amorphous structure.
The structural heterogeneity and mechanical inhomogeneity of metallic glasses at the nanoscale have been demonstrated by extensive experimental investigations, while their inherent correlation remains ambiguous. Based on elasticity theory, a model is developed to describe the local structural response of metallic glasses under hydrostatic deformation. We establish a linear relationship between the local bulk modulus and the nontrivial power-law exponent of the structural response and further verify this relationship by molecular dynamics simulations. The intrinsic link between the local structural response and elastic modulus reveals that the mechanical heterogeneity reflects not only the static atomic packing but also the dynamic evolution of the amorphous structure. Our findings provide direct evidence that mechanical heterogeneity is a feasible indicator for describing the structural heterogeneity of metallic glasses and shed some light on the non-cubic structural power law of disordered materials.
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