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Amorphous alloys surpass E/10 strength limit at extreme strain rates

Author

Listed:
  • Wenqing Zhu

    (Peking University)

  • Zhi Li

    (Agency for Science, Technology and Research (A*STAR))

  • Hua Shu

    (China Academy of Engineering Physics)

  • Huajian Gao

    (Agency for Science, Technology and Research (A*STAR)
    Nanyang Technological University
    Tsinghua University)

  • Xiaoding Wei

    (Peking University
    Peking University Nanchang Innovation Institute)

Abstract

Theoretical predictions of the ideal strength of materials range from E/30 to E/10 (E is Young’s modulus). However, despite intense interest over the last decade, the value of the ideal strength achievable through experiments for metals remains a mystery. This study showcases the remarkable spall strength of Cu50Zr50 amorphous alloy that exceeds the E/10 limit at strain rates greater than 107 s−1 through laser-induced shock experiments. The material exhibits a spall strength of 11.5 GPa, approximately E/6 or 1/13 of its P-wave modulus, which sets a record for the elastic limit of metals. Electron microscopy and large-scale molecular dynamics simulations reveal that the primary failure mechanism at extreme strain rates is void nucleation and growth, rather than shear-banding. The rate dependence of material strength is explained by a void kinetic model controlled by surface energy. These findings help advance our understanding on the mechanical behavior of amorphous alloys under extreme strain rates.

Suggested Citation

  • Wenqing Zhu & Zhi Li & Hua Shu & Huajian Gao & Xiaoding Wei, 2024. "Amorphous alloys surpass E/10 strength limit at extreme strain rates," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45472-z
    DOI: 10.1038/s41467-024-45472-z
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    References listed on IDEAS

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