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Title: Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass

Abstract

To date, there has not yet been a direct observation of the initiation and propagation of individual defects in metallic glasses during deformation at the nanoscale. Here, we show through a combination of in situ nanobeam electron diffraction and large-scale molecular dynamics simulations that we can directly observe changes to the local short to medium range atomic ordering during the formation of a shear band. We observe experimentally a spatially resolved reduction of order prior to shear banding due to increased strain. We compare this to molecular dynamics simulations, in which a similar reduction in local order is seen, and caused by shear transformation zone activation, providing direct experimental evidence for this proposed nucleation mechanism for shear bands in amorphous solids. Our observation serves as a link between the atomistic molecular dynamics simulation and the bulk mechanical properties, providing insight into how one could increase ductility in glassy materials.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [2];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Austrian Academy of Sciences, Leoben (Austria)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1546689
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pekin, Thomas C., Ding, Jun, Gammer, Christoph, Ozdol, Burak, Ophus, Colin, Asta, Mark, Ritchie, Robert O., and Minor, Andrew M. Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass. United States: N. p., 2019. Web. doi:10.1038/s41467-019-10416-5.
Pekin, Thomas C., Ding, Jun, Gammer, Christoph, Ozdol, Burak, Ophus, Colin, Asta, Mark, Ritchie, Robert O., & Minor, Andrew M. Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass. United States. doi:10.1038/s41467-019-10416-5.
Pekin, Thomas C., Ding, Jun, Gammer, Christoph, Ozdol, Burak, Ophus, Colin, Asta, Mark, Ritchie, Robert O., and Minor, Andrew M. Tue . "Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass". United States. doi:10.1038/s41467-019-10416-5. https://www.osti.gov/servlets/purl/1546689.
@article{osti_1546689,
title = {Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass},
author = {Pekin, Thomas C. and Ding, Jun and Gammer, Christoph and Ozdol, Burak and Ophus, Colin and Asta, Mark and Ritchie, Robert O. and Minor, Andrew M.},
abstractNote = {To date, there has not yet been a direct observation of the initiation and propagation of individual defects in metallic glasses during deformation at the nanoscale. Here, we show through a combination of in situ nanobeam electron diffraction and large-scale molecular dynamics simulations that we can directly observe changes to the local short to medium range atomic ordering during the formation of a shear band. We observe experimentally a spatially resolved reduction of order prior to shear banding due to increased strain. We compare this to molecular dynamics simulations, in which a similar reduction in local order is seen, and caused by shear transformation zone activation, providing direct experimental evidence for this proposed nucleation mechanism for shear bands in amorphous solids. Our observation serves as a link between the atomistic molecular dynamics simulation and the bulk mechanical properties, providing insight into how one could increase ductility in glassy materials.},
doi = {10.1038/s41467-019-10416-5},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {6}
}

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