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Title: Deformation in metallic glasses studied by synchrotron x-ray diffraction

In this study, high mechanical strength is one of the superior properties of metallic glasses which render them promising as a structural material. However, understanding the process of mechanical deformation in strongly disordered matter, such as metallic glass, is exceedingly difficult because even an effort to describe the structure qualitatively is hampered by the absence of crystalline periodicity. In spite of such challenges, we demonstrate that high-energy synchrotron X-ray diffraction measurement under stress, using a two-dimensional detector coupled with the anisotropic pair-density function (PDF) analysis, has greatly facilitated the effort of unraveling complex atomic rearrangements involved in the elastic, anelastic, and plastic deformation of metallic glasses. Even though PDF only provides information on the correlation between two atoms and not on many-body correlations, which are often necessary in elucidating various properties, by using stress as means of exciting the system we can garner rich information on the nature of the atomic structure and local atomic rearrangements during deformation in glasses.
 [1] ;  [2] ;  [3]
  1. University of Tennessee, Knoxville, TN (United States)
  2. University of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. University of Tennessee, Knoxville, TN (United States); City Univ. of Hong Kong, Hong Kong (China)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
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Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2075-4701
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE metallic glasses; mechanical deformation; anisotropic PDF analysis; high-energy X-ray diffraction