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Hydrogen embrittlement in metallic nanowires

Author

Listed:
  • Sheng Yin

    (Brown University)

  • Guangming Cheng

    (North Carolina State University)

  • Tzu-Hsuan Chang

    (North Carolina State University)

  • Gunther Richter

    (Max Planck Institute for Intelligent Systems)

  • Yong Zhu

    (North Carolina State University)

  • Huajian Gao

    (Brown University)

Abstract

Although hydrogen embrittlement has been observed and extensively studied in a wide variety of metals and alloys, there still exist controversies over the underlying mechanisms and a fundamental understanding of hydrogen embrittlement in nanostructures is almost non-existent. Here we use metallic nanowires (NWs) as a platform to study hydrogen embrittlement in nanostructures where deformation and failure are dominated by dislocation nucleation. Based on quantitative in-situ transmission electron microscopy nanomechanical testing and molecular dynamics simulations, we report enhanced yield strength and a transition in failure mechanism from distributed plasticity to localized necking in penta-twinned Ag NWs due to the presence of surface-adsorbed hydrogen. In-situ stress relaxation experiments and simulations reveal that the observed embrittlement in metallic nanowires is governed by the hydrogen-induced suppression of dislocation nucleation at the free surface of NWs.

Suggested Citation

  • Sheng Yin & Guangming Cheng & Tzu-Hsuan Chang & Gunther Richter & Yong Zhu & Huajian Gao, 2019. "Hydrogen embrittlement in metallic nanowires," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10035-0
    DOI: 10.1038/s41467-019-10035-0
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