Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 27, Issue 6, Pages 858-867Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2010.09.010
Keywords
Mechanical properties testing-compression test; Amorphous materials-metallic glasses; Mechanical properties-brittle-to-ductile transition; Mechanical properties-yield phenomena
Funding
- NSF MRSEC [DMR-0520565]
- ONR, Caltech [00140910883]
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We report results of uniaxial compression tests on Zr35Ti30Co6Be29 metallic glass nanopillars with diameters ranging from similar to 1.6 mu m to similar to 100 nm. The tested pillars have nearly vertical sidewalls, with the tapering angle lower than similar to 1 degrees (diameter > 200 nm) or similar to 2 degrees (diameter similar to 100 nm), and with a flat pillar top to minimize the artifacts due to imperfect geometry. We report that highly-localized-to-homogeneous deformation mode change occurs at 100 nm diameter, without any change in the yield strength. We also find that yield strength depends on size only down to 800 nm, below which it remains at its maximum value of 2.6 GPa. Quantitative Weibull analysis suggests that the increase in strength cannot be solely attributed to the lower probability of having weak flaws in small samples - most likely there is an additional influence of the sample size on the plastic deformation mechanism. (c) 2010 Elsevier Ltd. All rights reserved.
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