Strain-driven Kovacs-like memory effect in glasses

Yu Tong, Lijian Song (), Yurong Gao, Longlong Fan, Fucheng Li, Yiming Yang, Guang Mo, Yanhui Liu, Xiaoxue Shui, Yan Zhang, Meng Gao, Juntao Huo, Jichao Qiao, Eloi Pineda () and Jun-Qiang Wang ()
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Yu Tong: Chinese Academy of Sciences
Lijian Song: Chinese Academy of Sciences
Yurong Gao: Chinese Academy of Sciences
Longlong Fan: Chinese Academy of Sciences
Fucheng Li: Chinese Academy of Sciences
Yiming Yang: Chinese Academy of Sciences
Guang Mo: Chinese Academy of Sciences
Yanhui Liu: Chinese Academy of Sciences
Xiaoxue Shui: Chinese Academy of Sciences
Yan Zhang: Chinese Academy of Sciences
Meng Gao: Chinese Academy of Sciences
Juntao Huo: Chinese Academy of Sciences
Jichao Qiao: Northwestern Polytechnical University
Eloi Pineda: Universitat Politècnica de Catalunya
Jun-Qiang Wang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Studying complex relaxation behaviors is of critical importance for understanding the nature of glasses. Here we report a Kovacs-like memory effect in glasses, manifested by non-monotonic stress relaxation during two-step high-to-low strains stimulations. During the stress relaxation process, if the strain jumps from a higher state to a lower state, the stress does not continue to decrease, but increases first and then decreases. The memory effect becomes stronger when the atomic motions become highly collective with a large activation energy, e.g. the strain in the first stage is larger, the temperature is higher, and the stimulation is longer. The physical origin of the stress memory effect is studied based on the relaxation kinetics and the in-situ synchrotron X-ray experiments. The stress memory effect is probably a universal phenomenon in different types of glasses.

Date: 2023
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DOI: 10.1038/s41467-023-44187-x

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