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Beam Effects on Atomic Dynamics in Metallic Glasses Studied With Electron Correlation Microscopy.

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Electron correlation microscopy (ECM) now studies atomic dynamics in metallic glasses at room temperature. Beam effects were analyzed, showing ECM is viable for disordered systems.

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ECMPdNiPbeam effectsbulk metallic glasselectron correlation microscopyrelaxationstructural dynamics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Microscopy

Background:

  • Metallic glasses (MGs) exhibit complex atomic dynamics near equilibrium.
  • Electron correlation microscopy (ECM) probes atomic dynamics via diffracted intensity correlations.
  • Previous ECM studies focused on higher temperatures.

Purpose of the Study:

  • Extend ECM to room temperature measurements for metallic glasses.
  • Investigate the influence of the electron beam on atomic dynamics.
  • Validate ECM for studying disordered systems at ambient conditions.

Main Methods:

  • Utilized electron correlation microscopy (ECM) at room temperature.
  • Calculated two-time correlation functions of diffracted intensities.
  • Analyzed the effect of varying electron dose rates on dynamics.

Main Results:

  • Established ECM measurements at room temperature for metallic glasses.
  • Observed an inverse relationship between electron dose rate and correlation decay times.
  • Found dynamical mechanisms (stretching exponent) independent of electron dose rate.
  • Extrapolated results align with X-ray photon correlation spectroscopy (XPCS).

Conclusions:

  • Beam-driven ECM is a valid technique for studying dynamics in disordered systems at room temperature.
  • ECM provides insights into atomic rearrangements in metallic glasses.
  • The findings support the use of ECM for materials research under ambient conditions.