Flow serration and shear-band viscosity during inhomogeneous deformation of a Zr-based bulk metallic glass

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)762-767
Journal / PublicationIntermetallics
Issue number9
Publication statusPublished - Sep 2009
Externally publishedYes


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. © 2009 Elsevier Ltd. All rights reserved.

Research Area(s)

  • B. Glasses, metallic, B. Mechanical properties at ambient temperature, B. Plastic deformation mechanisms, F. Mechanical testing

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