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

Thomas C. Pekin (), Jun Ding, Christoph Gammer, Burak Ozdol, Colin Ophus, Mark Asta, Robert O. Ritchie and Andrew M. Minor ()
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Thomas C. Pekin: University of California
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
Robert O. Ritchie: University of California
Andrew M. Minor: University of California

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-10416-5

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