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Metals 2016, 6(1), 22;

Deformation in Metallic Glasses Studied by Synchrotron X-Ray Diffraction

1,2,3,* , 1,4,†
Department of Materials Science and Engineering, Joint-Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996, USA
Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, TN 37831, USA
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Klaus-Dieter Liss
Received: 10 December 2015 / Revised: 6 January 2016 / Accepted: 7 January 2016 / Published: 11 January 2016
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
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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. View Full-Text
Keywords: metallic glasses; mechanical deformation; anisotropic PDF analysis; high-energy X-ray diffraction metallic glasses; mechanical deformation; anisotropic PDF analysis; high-energy X-ray diffraction

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Egami, T.; Tong, Y.; Dmowski, W. Deformation in Metallic Glasses Studied by Synchrotron X-Ray Diffraction. Metals 2016, 6, 22.

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