Journal
NANO LETTERS
Volume 20, Issue 10, Pages 7558-7565Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03026
Keywords
Viscoelasticity; Spatial heterogeneity; Nanoscale; Force spectroscopy; Metallic glasses
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Funding
- Office of Naval Research [N00014-16-1-2401, N00014-20-12704]
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Nanoscale viscoelastic heterogeneity is an important concept for understanding the relationship between the microscopic atomic structure and the macroscopic mechanical behaviors in metallic glasses. However, the direct measurement of viscoelastic behavior at the nanoscale is still missing. Here we report a new measurement method based on static force microscopy to directly measure the viscoelastic properties at the nanoscale. The observed adhesive force and elastic modulus maps clearly display a typical hierarchical viscoelastic microstructure consisting of local hard and soft regions. Moreover, the adhesive force is more sensitive than the elastic modulus to viscoelastic heterogeneity and exhibits a bimodal distribution. In addition, we found that the structural relaxation and the rejuvenation effects induce the transition between the solid-like and liquid-like modes. The new measurement technique provides a powerful and quantative tool to investigate the nanoscale heterogeneity and build a connection between the microscopic structure and macroscopic mechanical behaviors in amorphous materials.
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