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Structural dynamics and rejuvenation during cryogenic cycling in a Zr-based metallic glass

Das, A. ; Dufresne, E.M. ; Maaß, R.

Acta materialia, 2020-09, Vol.196, p.723-732 [Periódico revisado por pares]

United States: Elsevier Ltd

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  • Título:
    Structural dynamics and rejuvenation during cryogenic cycling in a Zr-based metallic glass
  • Autor: Das, A. ; Dufresne, E.M. ; Maaß, R.
  • Assuntos: cryogenic cycling ; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY ; metallic glass ; Metallic glass, relaxation, rejuvenation, cryogenic cycling, structural dynamics ; rejuvenation ; relaxation ; structural dynamics
  • É parte de: Acta materialia, 2020-09, Vol.196, p.723-732
  • Notas: AC02-06CH11357
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
  • Descrição: Subjecting metallic glasses repeatedly to liquid nitrogen temperature has become a popular method to homogeneously rejuvenate the material. Here we reveal the atomic-scale structural dynamics using in-situ x-ray photon correlation spectroscopy (XPCS) during and after cryogenic cycling of a Zr-based metallic glass in two structural states (plate and ribbon). Heterogeneous structural dynamics is observed at 300 K that changes to monotonic aging at 78 K. It is found that cryogenic cycling homogenizes the relaxation time distribution. This effect is much more pronounced in the ribbon, which is the only structural state that rejuvenates upon cycling. We furthermore reveal how fast atomic-scale dynamics is correlated with long-time structural relaxation times irrespective of the structural state, and that the ribbon exhibits unexpected additional fast atomic-scale relaxation in comparison to the plate material. A structural picture emerges that points towards heterogeneities in the fictive temperature as a requirement for cryogenic energy storage. [Display omitted]
  • Editor: United States: Elsevier Ltd
  • Idioma: Inglês
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