Spatiotemporally inhomogeneous plastic flow of a bulk-metallic glass

Journal Article · Tue Jan 01 04:00:00 UTC 2008 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2007.01.015· OSTI ID:1050923

Jiang, W H ^[1]; Fan, G J ^[1]; Liu, F. X. ^[2]; Wang, G Y ^[2]; Choo, H ^[1]; Liaw, P ^[1]

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1. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
2. University of Tennessee, Knoxville (UTK)

With geometrically-constrained specimens, the spatiotemporally inhomogeneous deformation of a Zr-based bulk-metallic glass in uniaxial, quasistatic, compression was investigated. Decreasing the height/width ratio of specimens from 2 to 0.5 significantly increases the plastic strain from 2% to about 80%. Using an infrared camera, we first observe in situ dynamic shear-banding operations during compression at various strain rates. The shear banding is highly dependent on strain rates, either intermittent at the lower strain rate or successive at the higher strain rate. Scanning electron microscopy observations show the spatiality of the rate-dependent shear banding. The serrated plastic flow is a result of the shear-banding operations. At the lower strain rate, more simultaneous shear-banding operations result in more obvious serrations, while at the higher strain rate, fewer simultaneous shear-banding operations cause less obvious serrations. 2007 Elsevier Ltd. All rights reserved.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1050923
• Journal Information: International Journal of Plasticity, Journal Name: International Journal of Plasticity Journal Issue: 1 Vol. 24; ISSN 0749-6419
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION
DEFORMATION
GLASS
PLASTICS
SCANNING ELECTRON MICROSCOPY
SHEAR
STRAIN RATE
STRAINS