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

110 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)762-767
Journal / PublicationIntermetallics
Volume17
Issue number9
Publication statusPublished - Sep 2009
Externally publishedYes

Abstract

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

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.