Distinct relaxation mechanism at room temperature in metallic glass

Yi-Tao Sun (), Rui Zhao, Da-Wei Ding, Yan-Hui Liu, Hai-Yang Bai, Mao-Zhi Li () and Wei-Hua Wang
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Yi-Tao Sun: Chinese Academy of Sciences
Rui Zhao: Chinese Academy of Sciences
Da-Wei Ding: Chinese Academy of Sciences
Yan-Hui Liu: Chinese Academy of Sciences
Hai-Yang Bai: Chinese Academy of Sciences
Mao-Zhi Li: Renmin University of China
Wei-Hua Wang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract How glasses relax at room temperature is still a great challenge for both experimental and simulation studies due to the extremely long relaxation time-scale. Here, by employing a modified molecular dynamics simulation technique, we extend the quantitative measurement of relaxation process of metallic glasses to room temperature. Both energy relaxation and dynamics, at low temperatures, follow a stretched exponential decay with a characteristic stretching exponent β = 3/7, which is distinct from that of supercooled liquid. Such aging dynamics originates from the release of energy, an intrinsic nature of out-of-equilibrium system, and manifests itself as the elimination of defects through localized atomic strains. This finding is also supported by long-time stress-relaxation experiments of various metallic glasses, confirming its validity and universality. Here, we show that the distinct relaxation mechanism can be regarded as a direct indicator of glass transition from a dynamic perspective.

Date: 2023
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DOI: 10.1038/s41467-023-36300-x

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