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Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal

Author

Listed:
  • Yan Lu

    (Beijing University of Technology)

  • Yongchao Chen

    (University of Science and Technology of China
    Georgia Institute of Technology)

  • Yongpan Zeng

    (Tsinghua University)

  • Yin Zhang

    (Georgia Institute of Technology)

  • Deli Kong

    (Beijing University of Technology)

  • Xueqiao Li

    (Beijing University of Technology)

  • Ting Zhu

    (Georgia Institute of Technology)

  • Xiaoyan Li

    (Tsinghua University)

  • Shengcheng Mao

    (Beijing University of Technology)

  • Ze Zhang

    (Zhejiang University)

  • Lihua Wang

    (Beijing University of Technology)

  • Xiaodong Han

    (Beijing University of Technology)

Abstract

Understanding the competing modes of brittle versus ductile fracture is critical for preventing the failure of body-centered cubic (BCC) refractory metals. Despite decades of intensive investigations, the nanoscale fracture processes and associated atomistic mechanisms in BCC metals remain elusive due to insufficient atomic-scale experimental evidence. Here, we perform in situ atomic-resolution observations of nanoscale fracture in single crystals of BCC Mo. The crack growth process involves the nucleation, motion, and interaction of dislocations on multiple 1/2 {110} slip systems at the crack tip. These dislocation activities give rise to an alternating sequence of crack-tip plastic shearing, resulting in crack blunting, and local separation normal to the crack plane, leading to crack extension and sharpening. Atomistic simulations reveal the effects of temperature and strain rate on these alternating processes of crack growth, providing insights into the dislocation-mediated mechanisms of the ductile to brittle transition in BCC refractory metals.

Suggested Citation

  • Yan Lu & Yongchao Chen & Yongpan Zeng & Yin Zhang & Deli Kong & Xueqiao Li & Ting Zhu & Xiaoyan Li & Shengcheng Mao & Ze Zhang & Lihua Wang & Xiaodong Han, 2023. "Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41090-3
    DOI: 10.1038/s41467-023-41090-3
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    References listed on IDEAS

    as
    1. Ling Huang & Qing-Jie Li & Zhi-Wei Shan & Ju Li & Jun Sun & Evan Ma, 2011. "A new regime for mechanical annealing and strong sample-size strengthening in body centred cubic molybdenum," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    2. Ju Li & Krystyn J. Van Vliet & Ting Zhu & Sidney Yip & Subra Suresh, 2002. "Atomistic mechanisms governing elastic limit and incipient plasticity in crystals," Nature, Nature, vol. 418(6895), pages 307-310, July.
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