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Title: Shear-band thickness and shear-band cavities in a Zr-based metallic glass

Journal Article · · Acta Materialia
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. Univ. of Goettingen, Goettingen (Germany)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

Strain localization into shear bands in metallic glasses is typically described as a mechanism that occurs at the nano-scale, leaving behind a shear defect with a thickness of 10–20 nm. Here we sample the structure of a single system-spanning shear band that has carried all plastic flow with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and high-energy x-ray tomography (XRT). It is found that the shear-band thickness and the density change relative to the matrix sensitively depend on position along the shear band. A wide distribution of shear-band thickness (10 nm–210 nm) and density change (–1% to –12%) is revealed. There is no obvious correlation between shear-band thickness and density change, but larger thicknesses correspond typically to higher density changes. More than 100 micron-size shear-band cavities were identified on the shear-band plane, and their three-dimensional arrangement suggests a strongly fluctuating local curvature of the shear plane. As a result, these findings urge for a more complex view of a shear band than a simple nano-scale planar defect.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); University of Illinois, Urbana-Champaign
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1393189
Alternate ID(s):
OSTI ID: 1549845
Journal Information:
Acta Materialia, Vol. 140, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (10)

Dilatancy induced ductile–brittle transition of shear band in metallic glasses journal April 2018
Shear band broadening in simulated glasses journal November 2018
Complex Dynamical Behavior in the Shear-Displacement Model for Bulk Metallic Glasses during Plastic Deformation journal December 2018
Shear-Transformation Zone Activation during Loading and Unloading in Nanoindentation of Metallic Glasses journal May 2019
Shear banding leads to accelerated aging dynamics in a metallic glass journal January 2018
Shear-band affected zone revealed by magnetic domains in a ferromagnetic metallic glass journal October 2018
Dual self-organised shear banding behaviours and enhanced ductility in phase separating Zr-based bulk metallic glasses text January 2018
Effect of nanocrystalline process on microstructure of Zr-based metallic glass journal November 2018
Dual self-organised shear banding behaviours and enhanced ductility in phase separating Zr-based bulk metallic glasses journal March 2018
Shear Band Broadening in Simulated Glasses text January 2018

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