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Pressure-induced nonmonotonic cross-over of steady relaxation dynamics in a metallic glass

Xin Zhang,H. Lou,B. Ruta,Y. Chushkin,F. Zontone,Shubin Li,Dazhe Xu,T. Liang,Z. Zeng,H. Mao,Q. Zeng

Published 2023 in Proceedings of the National Academy of Sciences of the United States of America

ABSTRACT

Significance A major stumbling block in our understanding of glass and glass phenomena is the elusive relationship between relaxation dynamics and glass structure. Here, we developed in situ high-pressure high-energy X-ray photon correlation spectroscopy, which offers opportunities for studies of atomic-scale glassy relaxation dynamics in various glass systems with their atomic structures significantly tuned by extreme compression. With this technique, we discover that the steady structural relaxation time of a Ce-based metallic glass does not simply scale with overall density or stress level as typically expected, but shows an anomalous nonmonotonic cross-over at ~3 GPa, which explicitly couples with changes of structural configurations revealed by in situ high-pressure X-ray diffraction.

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