Size-dependent deformation behavior in nanosized amorphous metals suggesting transition from collective to individual atomic transport

Naijia Liu, Sungwoo Sohn (), Min Young Na, Gi Hoon Park, Arindam Raj, Guannan Liu, Sebastian A. Kube, Fusen Yuan, Yanhui Liu, Hye Jung Chang and Jan Schroers ()
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Naijia Liu: Yale University
Sungwoo Sohn: Yale University
Min Young Na: Korea Institute of Science and Technology
Gi Hoon Park: Korea Institute of Science and Technology
Arindam Raj: Yale University
Guannan Liu: Yale University
Sebastian A. Kube: Yale University
Fusen Yuan: Chinese Academy of Sciences
Yanhui Liu: Chinese Academy of Sciences
Hye Jung Chang: Korea Institute of Science and Technology
Jan Schroers: Yale University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The underlying atomistic mechanism of deformation is a central problem in mechanics and materials science. Whereas deformation of crystalline metals is fundamentally understood, the understanding of deformation of amorphous metals lacks behind, particularly identifying the involved temporal and spatial scales. Here, we reveal that at small scales the size-dependent deformation behavior of amorphous metals significantly deviates from homogeneous flow, exhibiting increasing deformation rate with reducing size and gradually shifted composition. This transition suggests the deformation mechanism changes from collective atomic transport by viscous flow to individual atomic transport through interface diffusion. The critical length scale of the transition is temperature dependent, exhibiting a maximum at the glass transition. While viscous flow does not discriminate among alloy constituents, diffusion does and the constituent element with higher diffusivity deforms faster. Our findings yield insights into nano-mechanics and glass physics and may suggest alternative processing methods to epitaxially grow metallic glasses.

Date: 2023
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DOI: 10.1038/s41467-023-41582-2

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