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Position: Home > issue > May 28, 2021 Volume 2, Issue 2
Unusually thick shear-softening surface of micrometer-size metallic glasses
Category: Report
Author: J. Dong, Y. Huan, B. Huang, J. Yi, Y.H. Liu, B.A. Sun, W.H. Wang, H.Y. Bai

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Graphical abstract


The surface of glass is crucial for understanding many fundamental processes in glassy solids. A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of nanometers. Here, we measured the shear modulus at the surface of both millimeter-size and micrometer-size metallic glasses (MGs) through high-sensitivity torsion techniques. We found a pronounced shear-modulus softening at the surface of MGs. Compared with the bulk, the maximum decrease in the surface shear modulus (G) for the micro-scale MGs reaches ~27%, which is close to the decrease in the G upon glass transition, yet it still behaves solid-like.





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