Journal Article

PUBDB-2025-04301

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Linking the pressure dependence of the structure and thermal stability to $α$-and $β$-relaxations in metallic glasses

Shen, J. (Corresponding author)Extern* ; Cornet, A.Extern* ; Ronca, A.Extern* ; Pineda, E.Extern* ; Yang, F.Extern* ; Garden, J.-L. ; Moiroux, G. ; Vaughan, G. ; Michiel, M. d. ; Garbarino, G. ; Westermeier, F.XFEL.EU*DESY* ; Goujon, C. ; Legendre, M. ; Liu, J.Extern* ; Cangialosi, D. ; Ruta, B. (Corresponding author)Extern*

2025
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/sciadv.adz7406  doi:10.3204/PUBDB-2025-04301

Abstract: Glasses derive their functional properties from complex relaxation dynamics that remain enigmatic under extreme conditions. Although the temperature dependence of these relaxation processes is well established, their behavior under high-pressure conditions remains poorly understood due to substantial experimental difficulties. In this study, we use cutting-edge experimental techniques to probe the pressure evolution of the relaxation spectrum in a Zr$_{46.8}$Ti$_{8.2}$Cu$_{7.5}$Ni$_{10}$Be$_{27.5}$ metallic glass across gigapascal pressure ranges. Our findings reveal two distinct relaxation mechanisms under high pressure: In the β-relaxation regime, compression drives the system with reduced atomic mobility and enhanced structural disorder, without appreciable density changes. Conversely, α-relaxation under pressure promotes density-driven structural ordering that improves thermal stability. Notably, the transition between these regimes occurs at a constant T/T$_g$,P ratio, independent of applied pressure. These results provide crucial insights for decoupling the competing structural and relaxation contributions to glass stability, establishing a systematic framework for tailoring glass properties through controlled thermomechanical processing.

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Contributing Institute(s):

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

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2025

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