Effects of size on the strength and deformation mechanism in Zr-based metallic glasses. (English) Zbl 1426.74007
Summary: We report results of uniaxial compression tests on \(Zr_{35}Ti_{30}Co_{6}Be_{29}\) metallic glass nano-pillars with diameters ranging from \(\sim 1.6 \, \mu m\) to \(\sim 100 \, nm\). The tested pillars have nearly vertical sidewalls, with the tapering angle lower than \(\sim 1^\circ\) (diameter \(>\) 200 nm) or \(\sim 2^\circ\) (diameter \(\sim 100 \, nm\)), 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.
MSC:
| 74-05 | Experimental work for problems pertaining to mechanics of deformable solids |
| 74C99 | Plastic materials, materials of stress-rate and internal-variable type |
Keywords:
mechanical properties testing-compression test; amorphous materials-metallic glasses; mechanical properties-brittle-to-ductile transition; mechanical properties-yield phenomenaReferences:
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