Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23889
Title: Softening-induced plastic flow instability and indentation size effect in metallic glass
Authors: Wang, S
Ye, YF
Sun, BA
Liu, CT
Shi, SQ 
Yang, Y
Keywords: Indentation
Metallic glasses
Shear instability
Strength scaling
Issue Date: 2015
Publisher: Elsevier Ltd
Source: Journal of the mechanics and physics of solids, 2015, v. 77, p. 70-85 How to cite?
Journal: Journal of the Mechanics and Physics of Solids 
Abstract: Despite the absence of microstructural features, metallic glasses (MGs) could display size-dependent hardness at the submicron scale. While most early studies attributed this size effect to Weibull statistics, here we propose a mechanism related to shear softening induced flow instability that can give rise to a deterministic indentation size effect in MGs. In line with this mechanism, an explicit relation is derived linking the size dependency of hardness to a critical length scale that governs the transition from a stable to unstable plastic flow in MGs. Through a series of carefully designed spherical indentation tests, this mechanism is experimentally justified, from which we are able to extract the critical transition length for a Zr-based MG at different indentation strain rates. On the basis of the combined theoretical/experimental efforts, our current work provides a quantitative insight into the indentation size effect in MGs.
URI: http://hdl.handle.net/10397/23889
ISSN: 0022-5096
DOI: 10.1016/j.jmps.2015.01.008
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