Correlation between structural heterogeneity and plastic deformation for phase separating FeCu metallic glasses View Full Text


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Article Info

DATE

2016-09-29

AUTHORS

Chuan-Xiao Peng, Kai-Kai Song, Li Wang, Daniel Şopu, Simon Pauly, Jürgen Eckert

ABSTRACT

Unlike crystalline metals, the plastic deformation of metallic glasses (MGs) involves a competition between disordering and structural relaxation ordering, which is not well understood, yet. Molecular dynamics (MD) simulations were performed to investigate the evolutions of strain localizations, short-range order (SRO) as well as the free volume in the glass during compressive deformation of Fe50Cu50 MGs with different degrees of phase separation. Our findings indicate that the free volume in the phase separating MGs decreases while the shear strain localizations increase with increasing degree of phase separation. Cu-centered clusters show higher potential energies and Voronoi volumes, and bear larger local shear strains. On the other hand, Fe-centered pentagon-rich clusters in Cu-rich regions seem to play an important role to resist the shear transformation. The dilatation or annihilation of Voronoi volumes is due to the competition between ordering via structural relaxation and shear stress-induced deformation. The present study could provide a better understanding of the relationship between the structural inhomogeneity and the deformation of MGs. More... »

PAGES

34340

References to SciGraph publications

  • <error retrieving object. in <ERROR RETRIEVING OBJECT
  • 2007-08. Bulk Metallic Glasses: At the Cutting Edge of Metals Research in MRS BULLETIN
  • 2006-01. Atomic packing and short-to-medium-range order in metallic glasses in NATURE
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    http://scigraph.springernature.com/pub.10.1038/srep34340

    DOI

    http://dx.doi.org/10.1038/srep34340

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/27681052


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