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

Author

Listed:
  • Thomas C. Pekin

    (University of California
    Lawrence Berkeley National Laboratory)

  • Jun Ding

    (Lawrence Berkeley National Laboratory)

  • Christoph Gammer

    (Austrian Academy of Sciences)

  • Burak Ozdol

    (Lawrence Berkeley National Laboratory)

  • Colin Ophus

    (Lawrence Berkeley National Laboratory)

  • Mark Asta

    (University of California
    Lawrence Berkeley National Laboratory)

  • Robert O. Ritchie

    (University of California
    Lawrence Berkeley National Laboratory)

  • Andrew M. Minor

    (University of California
    Lawrence Berkeley National Laboratory)

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.

Suggested Citation

  • Thomas C. Pekin & Jun Ding & Christoph Gammer & Burak Ozdol & Colin Ophus & Mark Asta & Robert O. Ritchie & Andrew M. Minor, 2019. "Direct measurement of nanostructural change during in situ deformation of a bulk metallic glass," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10416-5
    DOI: 10.1038/s41467-019-10416-5
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    Cited by:

    1. Mingjian Wu & Christina Harreiß & Colin Ophus & Manuel Johnson & Rainer H. Fink & Erdmann Spiecker, 2022. "Seeing structural evolution of organic molecular nano-crystallites using 4D scanning confocal electron diffraction (4D-SCED)," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    2. Oleksandr Glushko & Reinhard Pippan & Daniel Şopu & Christian Mitterer & Jürgen Eckert, 2024. "How to catch a shear band and explain plasticity of metallic glasses with continuum mechanics," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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