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

Yan Lu, Yongchao Chen, Yongpan Zeng, Yin Zhang, Deli Kong, Xueqiao Li, Ting Zhu (), Xiaoyan Li (), Shengcheng Mao, Ze Zhang, Lihua Wang () and Xiaodong Han ()
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Yan Lu: Beijing University of Technology
Yongchao Chen: University of Science and Technology of China
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

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-41090-3

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