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Bulk Metallic Glasses Deform via Slip Avalanches

James Antonaglia, Wendelin J. Wright, Xiaojun Gu, Rachel R. Byer, Todd C. Hufnagel, Michael LeBlanc, Jonathan T. Uhl, and Karin A. Dahmen
Phys. Rev. Lett. 112, 155501 – Published 14 April 2014
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Abstract

For the first time in metallic glasses, we extract both the exponents and scaling functions that describe the nature, statistics, and dynamics of slip events during slow deformation, according to a simple mean field model. We model the slips as avalanches of rearrangements of atoms in coupled shear transformation zones (STZs). Using high temporal resolution measurements, we find the predicted, different statistics and dynamics for small and large slips thereby excluding self-organized criticality. The agreement between model and data across numerous independent measures provides evidence for slip avalanches of STZs as the elementary mechanism of inhomogeneous deformation in metallic glasses.

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  • Received 21 December 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.155501

© 2014 American Physical Society

Authors & Affiliations

James Antonaglia1, Wendelin J. Wright2,3, Xiaojun Gu2, Rachel R. Byer4, Todd C. Hufnagel5, Michael LeBlanc1, Jonathan T. Uhl*, and Karin A. Dahmen1,†

  • 1Department of Physics and Institute of Condensed Matter Theory, University of Illinois at Urbana Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA
  • 2Department of Mechanical Engineering, One Dent Drive, Bucknell University, Lewisburg, Pennsylvania 17837, USA
  • 3Department of Chemical Engineering, One Dent Drive, Bucknell University, Lewisburg, Pennsylvania 17837, USA
  • 4Department of Physics and Astronomy, One Dent Drive, Bucknell University, Lewisburg, Pennsylvania 17837, USA
  • 5Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA

  • *Retired.
  • Corresponding author. dahmen@illinois.edu

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Issue

Vol. 112, Iss. 15 — 18 April 2014

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