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Title: Shear banding leads to accelerated aging dynamics in a metallic glass

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1422552
Alternate Identifier(s):
OSTI ID: 1416629
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Küchemann, Stefan, Liu, Chaoyang, Dufresne, Eric M., Shin, Jeremy, and Maaß, Robert. Shear banding leads to accelerated aging dynamics in a metallic glass. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.014204.
Küchemann, Stefan, Liu, Chaoyang, Dufresne, Eric M., Shin, Jeremy, & Maaß, Robert. Shear banding leads to accelerated aging dynamics in a metallic glass. United States. doi:10.1103/PhysRevB.97.014204.
Küchemann, Stefan, Liu, Chaoyang, Dufresne, Eric M., Shin, Jeremy, and Maaß, Robert. Thu . "Shear banding leads to accelerated aging dynamics in a metallic glass". United States. doi:10.1103/PhysRevB.97.014204.
@article{osti_1422552,
title = {Shear banding leads to accelerated aging dynamics in a metallic glass},
author = {Küchemann, Stefan and Liu, Chaoyang and Dufresne, Eric M. and Shin, Jeremy and Maaß, Robert},
abstractNote = {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.},
doi = {10.1103/PhysRevB.97.014204},
journal = {Physical Review B},
number = 1,
volume = 97,
place = {United States},
year = {Thu Jan 11 00:00:00 EST 2018},
month = {Thu Jan 11 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
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