Structural signature of plastic deformation in metallic glasses

The structure feature of a model CuZr metallic glass during deformation is investigated by molecular dynamics simulations. A spatially heterogeneous irreversible rearrangement is observed in terms of nonaffine displacement. We find that regions with smaller nonaffine displacement have more Voronoi p...

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Bibliographic Details
Published in:Physical review letters 2011-03, Vol.106 (13), p.135503-135503, Article 135503
Main Authors: Peng, H L, Li, M Z, Wang, W H
Format: Article
Language:English
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Summary:The structure feature of a model CuZr metallic glass during deformation is investigated by molecular dynamics simulations. A spatially heterogeneous irreversible rearrangement is observed in terms of nonaffine displacement. We find that regions with smaller nonaffine displacement have more Voronoi pentagons, while in those with larger nonaffine displacement other types of faces are more populated. We use the degree of local fivefold symmetry (LFFS) as the structural indicator to predict plastic deformation of local structures and find that the plastic events prefer to be initiated in regions with a lower degree of LFFS and propagate toward regions with a higher degree of LFFS.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.135503