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

Journal Article · · Acta Materialia
 [1];  [2];  [3]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab.; Federal Institute of Materials Research and Testing (BAM), Berlin (Germany)
Subjecting metallic glasses repeatedly to liquid nitrogen temperature has become a popular method to homogeneously rejuvenate the material. Here in this paper 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.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1659103
Alternate ID(s):
OSTI ID: 1703878
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 196; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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