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Strain-driven Kovacs-like memory effect in glasses.

Yu Tong1, Lijian Song2,3, Yurong Gao1

  • 1CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China.

Nature Communications
|December 18, 2023
PubMed
Summary
This summary is machine-generated.

Researchers discovered a Kovacs-like memory effect in glasses, where stress initially increases before decreasing after a strain reduction. This memory effect in glassy materials is linked to collective atomic motion and may be universal.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Rheology

Background:

  • Understanding complex relaxation behaviors is crucial for characterizing the nature of glasses.
  • Glasses exhibit unique mechanical properties due to their disordered atomic structures.

Purpose of the Study:

  • To investigate and report a Kovacs-like memory effect in glasses.
  • To explore the factors influencing this memory effect and its underlying physical origins.

Main Methods:

  • Two-step high-to-low strain stimulations were applied to glassy materials.
  • Stress relaxation processes were monitored.
  • In-situ synchrotron X-ray experiments were conducted.
  • Relaxation kinetics were analyzed.

Main Results:

  • A non-monotonic stress relaxation, characterized by an initial increase followed by a decrease, was observed after a strain jump from a higher to a lower state.
  • The observed memory effect intensified with increased strain in the first stage, higher temperatures, and longer stimulation durations, correlating with highly collective atomic motions and larger activation energies.
  • Synchrotron X-ray data provided insights into the physical mechanisms driving the stress memory effect.

Conclusions:

  • The study demonstrates a Kovacs-like memory effect in glasses, highlighting complex relaxation dynamics.
  • The findings suggest that this stress memory effect is likely a universal phenomenon across various types of glasses.
  • The research deepens the understanding of glass behavior and relaxation kinetics.