期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 77, 期 -, 页码 70-85出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2015.01.008
关键词
Metallic glasses; Strength scaling; Indentation; Shear instability
资金
- Research Grant Council (RGC)
- the Hong Kong Government, through the general research fund (GRF) [CityU530711, CityU117612]
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. (C) 2015 Elsevier Ltd. All rights reserved.
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