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Predicting Complex Relaxation Processes in Metallic Glass.

Yang Sun1, Si-Xu Peng2, Qun Yang2

  • 1Ames Laboratory, U.S. Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011, USA.

Physical Review Letters
|October 2, 2019
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Summary
This summary is machine-generated.

This study predicts complex relaxation behaviors in metallic glass using molecular dynamics simulations. Researchers identified main (α) relaxation, secondary (β) relaxation at low temperatures, and an anomalous (α₂) process, verified by experiments.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Relaxation processes critically impact glass material properties.
  • Understanding and theoretically predicting these relaxation mechanisms in glasses is challenging.

Purpose of the Study:

  • To investigate the complex relaxation behaviors in Al_{90}Sm_{10} metallic glass.
  • To theoretically predict and experimentally verify distinct relaxation processes.

Main Methods:

  • Utilized microsecond molecular dynamics simulations.
  • Employed an accurate many-body interaction potential for simulations.
  • Conducted experimental verification of simulation predictions.

Main Results:

  • Predicted complex relaxation behaviors including main (α) relaxation, secondary (β) relaxation at cryogenic temperatures, and an anomalous (α₂) relaxation process.
  • β relaxation is attributed to stringlike cooperative atomic rearrangements.
  • α₂ relaxation is linked to the decoupling of Al and Sm atom dynamics.

Conclusions:

  • The combination of simulations and experiments offers a new predictive approach for glass physics.
  • Microscopic origins of complex relaxation phenomena in metallic glasses have been elucidated.