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How thermally activated deformation starts in metallic glass

Author

Listed:
  • Yue Fan

    (Oak Ridge National Laboratory)

  • Takuya Iwashita

    (Joint Institute for Neutron Sciences, University of Tennessee)

  • Takeshi Egami

    (Oak Ridge National Laboratory
    Joint Institute for Neutron Sciences, University of Tennessee
    University of Tennessee)

Abstract

The studies on dynamics and deformation in glassy materials are particularly challenging because of their strongly disordered atomic structure. Here, by probing the changes in the atomic displacements and stresses at saddle points of the potential energy landscape, we show that thermally activated deformation is triggered by subnano-scale rearrangements of a small number of atoms, typically less than 10 atoms. The individual triggers are invariant of the cooling history or elastic structure of the system. However, the organizations between different trigger centres can be varied and are related to the overall stability of the system. This finding allows a semi-quantitative construction of the potential energy landscape and brings a new perspective to the study of the mechanical properties of glasses.

Suggested Citation

  • Yue Fan & Takuya Iwashita & Takeshi Egami, 2014. "How thermally activated deformation starts in metallic glass," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6083
    DOI: 10.1038/ncomms6083
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    Cited by:

    1. Yuan Wu & Di Cao & Yilin Yao & Guosheng Zhang & Jinyue Wang & Leqing Liu & Fengshou Li & Huiyang Fan & Xiongjun Liu & Hui Wang & Xianzhen Wang & Huihui Zhu & Suihe Jiang & Paraskevas Kontis & Dierk Ra, 2021. "Substantially enhanced plasticity of bulk metallic glasses by densifying local atomic packing," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Birte Riechers & Amlan Das & Eric Dufresne & Peter M. Derlet & Robert Maaß, 2024. "Intermittent cluster dynamics and temporal fractional diffusion in a bulk metallic glass," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Yifan Wang & Jing Liu & Jian-Zhong Jiang & Wei Cai, 2024. "Anomalous temperature dependence of elastic limit in metallic glasses," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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