Journal Article

PUBDB-2022-01119

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure-dynamics relationships in cryogenically deformed bulk metallic glass

Spieckermann, F. (Corresponding author)Extern* ; Şopu, D. ; Soprunyuk, V. ; Kerber, M. B.Extern* ; Bednarčík, J. ; Schökel, A.Extern*DESY* ; Rezvan, A. ; Ketov, S.Extern* ; Sarac, B. ; Schafler, E.Extern* ; Eckert, J.Extern*

2022
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-021-27661-2  doi:10.3204/PUBDB-2022-01119

Abstract: The atomistic mechanisms occurring during the processes of aging and rejuvenation in glassy materials involve very small structural rearrangements that are extremely difficult to capture experimentally. Here we use in-situ X-ray diffraction to investigate the structural rearrangements during annealing from 77 K up to the crystallization temperature in Cu$_{44}$Zr$_{44}$Al$_8$Hf$_2$Co$_2$ bulk metallic glass rejuvenated by high pressure torsion performed at cryogenic temperatures and at room temperature. Using a measure of the configurational entropy calculated from the X-ray pair correlation function, the structural footprint of the deformation-induced rejuvenation in bulk metallic glass is revealed. With synchrotron radiation, temperature and time resolutions comparable to calorimetric experiments are possible. This opens hitherto unavailable experimental possibilities allowing to unambiguously correlate changes in atomic configuration and structure to calorimetrically observed signals and can attribute those to changes of the dynamic and vibrational relaxations (α-, β- and γ-transition) in glassy materials. The results suggest that the structural footprint of the β-transition is related to entropic relaxation with characteristics of a first-order transition. Dynamic mechanical analysis data shows that in the range of the β-transition, non-reversible structural rearrangements are preferentially activated. The low-temperature γ-transition is mostly triggering reversible deformations and shows a change of slope in the entropic footprint suggesting second-order characteristics.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20170413 EC (I-20170413-EC) (I-20170413-EC)
4. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)

Appears in the scientific report 2022

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