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Structure-dynamics relationships in cryogenically deformed bulk metallic glass.

Florian Spieckermann1, Daniel Şopu2,3, Viktor Soprunyuk2,4

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This study reveals the atomistic mechanisms of aging and rejuvenation in metallic glasses using X-ray diffraction. It uncovers the structural footprint of deformation-induced rejuvenation and its relation to material transitions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Understanding aging and rejuvenation in glassy materials is challenging due to subtle atomic rearrangements.
  • Deformation processes like high-pressure torsion can induce rejuvenation in bulk metallic glasses.
  • Experimental techniques are needed to link structural changes to macroscopic properties.

Purpose of the Study:

  • To investigate atomistic mechanisms during aging and rejuvenation in a specific bulk metallic glass (Cu44Zr44Al8Hf2Co2).
  • To reveal the structural footprint of deformation-induced rejuvenation using in-situ X-ray diffraction.
  • To correlate structural changes with dynamic and vibrational relaxations (α-, β-, and γ-transitions).

Main Methods:

  • In-situ X-ray diffraction at cryogenic temperatures up to crystallization temperature.
  • High-pressure torsion for rejuvenation at cryogenic and room temperatures.
  • Calculation of configurational entropy from X-ray pair correlation function.
  • Dynamic mechanical analysis.

Main Results:

  • Deformation-induced rejuvenation in bulk metallic glass leaves a distinct structural footprint, measurable via configurational entropy.
  • The β-transition is linked to entropic relaxation and exhibits characteristics of a first-order transition, involving non-reversible rearrangements.
  • The γ-transition involves reversible deformations and shows second-order characteristics in the entropic footprint.

Conclusions:

  • In-situ X-ray diffraction provides high-resolution insights into structural rearrangements during thermal cycling of rejuvenated metallic glasses.
  • The study successfully correlates structural footprints with specific relaxation transitions (β and γ).
  • Findings offer a deeper understanding of the fundamental processes governing the mechanical behavior and stability of metallic glasses.