Dynamic Plasticity and Failure of Microscale Glass: Rate-Dependent Ductile-Brittle-Ductile Transition

Nano Letters
Rajaprakash RamachandramoorthyJohann Michler

Abstract

Glass has been recently envisioned as a stronger and more robust alternative to silicon in microelectromechanical system applications, including high-frequency resonators and switches. Identifying the dynamic mechanical properties of microscale glass is thus vital for understanding their ability to withstand shocks and vibrations in such demanding applications. However, despite nearly half a century of research, the micromechanical properties of glass and amorphous materials in general are primarily limited to quasi-static strain rates below ∼0.1/s. Here, we report the in situ high-strain-rate experiments of fused silica micropillars inside a scanning electron microscope at strain rates up to 1335/s. A remarkable ductile-brittle-ductile failure mode transition was observed at increasing strain rates from 0.0008 to 1335/s as the deformation flow transitions between homogeneous-serrated-homogeneous regimes. Detailed surface topography investigation of the tested micropillars revealed that at the intermediate strain rate (<∼6/s) serrated flow regime, the load drops are caused by the sequential propagation of individual shear bands. Further, analytical calculations and finite element simulations suggest that the atomistic mechanism...Continue Reading

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Citations

Sep 6, 2019·Proceedings of the National Academy of Sciences of the United States of America·Penghui CaoSidney Yip
Oct 9, 2020·Science Advances·Tero MäkinenMikko J Alava
Jul 11, 2021·Acta Biomaterialia·Cinzia PeruzziJakob Schwiedrzik
Mar 20, 2020·ACS Applied Materials & Interfaces·Adam J ClancyFrancois De Luca
Dec 3, 2021·Journal of the American Chemical Society·Remo N WidmerJohann Michler

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