Journal
INTERMETALLICS
Volume 17, Issue 9, Pages 762-767Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2009.03.005
Keywords
Glasses; metallic; Mechanical properties at ambient temperature; Plastic deformation mechanisms; Mechanical testing
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Funding
- US Department of Energy, Office of Basic Energy Sciences [DE-FG02-06ER46338]
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Uniaxial compressive behavior of Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass at room temperature was characterized with high-sensitivity strain gauges directly attached to test samples. Displacement-time curves exhibited micron-size serrations (or bursts) after the onset of yielding, apparently associated with discrete shear band formation. Each displacement burst disclosed three-step (acceleration, steady-state, and deceleration) process in shear band propagation. The viscosity of a propagating shear band was found to be relatively low and, actually, in a similar range usually measured in the supercooled liquid region. A detailed analysis of the experimental results using a self-consistent Vogel-Fulcher-Tamann (VFT) equation based on free volume model suggested that shear band propagation was mainly resulted from free volume accumulation. (C) 2009 Elsevier Ltd. All rights reserved.
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