Research ArticleMATERIALS SCIENCE

Structural rearrangements governing Johari-Goldstein relaxations in metallic glasses

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Science Advances  17 Nov 2017:
Vol. 3, no. 11, e1701577
DOI: 10.1126/sciadv.1701577
  • Fig. 1 Relaxation map of the Ni80P20 MG.

    The plot shows the α-relaxation time determined from ISF and MD-DMS (dynamical mechanical spectroscopy), the Johari-Goldstein secondary (β) relaxation time, and the most probable relaxation time of string-like motions as functions of temperature (top axis) and reciprocal temperature (bottom axis). VFT, Vogel-Fulcher-Tammann; CM, coupling model.

  • Fig. 2 String-like atomic motion in the Ni80P20 MG.

    (A) Probability density function p(u, δt) of atomic displacements at T = 440 K for different time intervals δt as indicated above. (B) Pair distribution function g(r) for T = 440 K. (C) Two-dimensional vector field of atomic displacements at T = 440 K and δt = 100 ns. Red (blue) vectors are for those displacement magnitudes larger (smaller) than 1.8 Å. (D) Typical 3D string-like configurations from simulations.

  • Fig. 3 Dynamic evolution of string-like motions.

    The plot shows the fraction of atoms in string-like configurations to the total number of fast-moving atoms as a function of time for different temperatures as indicated.

  • Fig. 4 The β relaxation as revealed by MD-DMS.

    (A to D) Loss modulus E″ of the Ni80P20 MG at testing periods tω = 100 ns (A), 30 ns (B), 10 ns (C), and 3 ns (D). (E) A schematic illustration of the atomic structure and rearrangement of an MG-based cooperative shear model. (F) The corresponding potential energy as a function of atomic displacements.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/3/11/e1701577/DC1

    fig. S1. Properties change during quenching of the Ni80P20 MG.

    fig. S2. Intermediate scattering function.

    fig. S3. Typical string-like configurations.

    fig. S4. Coordination analysis.

    fig. S5. Typical single atomic trajectories at T = 440 K and the duration of the observation time t = 1000 ns for three single atoms.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Properties change during quenching of the Ni80P20 MG.
    • fig. S2. Intermediate scattering function.
    • fig. S3. Typical string-like configurations.
    • fig. S4. Coordination analysis.
    • fig. S5. Typical single atomic trajectories at T = 440 K and the duration of the observation time t = 1000 ns for three single atoms.

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