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Shear banding leads to accelerated aging dynamics in a metallic glass

Journal Article · · Physical Review B
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Department of Materials Science and Engineering and Frederick-Seitz Materials Research Laboratory
  2. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)

Traditionally, strain localization in metallic glasses is related to the thickness of the shear defect, which is confined to the nanometer scale. In this study, using site-specific x-ray photon correlation spectroscopy (XPCS), we reveal significantly accelerated relaxation dynamics around a shear band in a metallic glass at a length scale that is orders of magnitude larger than the defect itself. The relaxation time in the shear-band vicinity is up to ten-times smaller compared to the as-cast matrix, and the relaxation dynamics occurs in a characteristic three-stage aging response that manifests itself in the temperature-dependent shape parameter known from classical stretched exponential relaxation dynamics of disordered materials. We demonstrate that the time-dependent correlation functions describing the aging at different temperatures can be captured and collapsed using simple scaling functions. Finally, these insights highlight how an ubiquitous nano-scale strain-localization mechanism in metallic glasses leads to a fundamental change of the relaxation dynamics at the mesoscale.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1422552
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Shear-band affected zone revealed by magnetic domains in a ferromagnetic metallic glass journal October 2018
Stress breaks universal aging behavior in a metallic glass journal November 2019
Shear-Transformation Zone Activation during Loading and Unloading in Nanoindentation of Metallic Glasses journal May 2019

Figures / Tables (7)


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