Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten

Jianfei Zhang, Yurong Li, Xiaochen Li, Yadi Zhai, Qing Zhang, Dongfeng Ma, Shengcheng Mao (), Qingsong Deng, Zhipeng Li, Xueqiao Li, Xiaodong Wang, Yinong Liu, Ze Zhang () and Xiaodong Han ()
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Jianfei Zhang: Beijing University of Technology
Yurong Li: Beijing University of Technology
Xiaochen Li: Beijing University of Technology
Yadi Zhai: Beijing University of Technology
Qing Zhang: Beijing University of Technology
Dongfeng Ma: Beijing University of Technology
Shengcheng Mao: Beijing University of Technology
Qingsong Deng: Beijing University of Technology
Zhipeng Li: Beijing University of Technology
Xueqiao Li: Beijing University of Technology
Xiaodong Wang: Chinese People’s Armed Police Force Academy
Yinong Liu: The University of Western Australia
Ze Zhang: Beijing University of Technology
Xiaodong Han: Beijing University of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Revealing the atomistic mechanisms for the high-temperature mechanical behavior of materials is important for optimizing their properties for service at high-temperatures and their thermomechanical processing. However, due to materials microstructure’s dynamic recovery and the absence of available in situ techniques, the high-temperature deformation behavior and atomistic mechanisms of materials are difficult to evaluate. Here, we report the development of a microelectromechanical systems-based thermomechanical testing apparatus that enables mechanical testing at temperatures reaching 1556 K inside a transmission electron microscope for in situ investigation with atomic-resolution. With this unique technique, we first uncovered that tungsten fractures at 973 K in a ductile manner via a strain-induced multi-step body-centered cubic (BCC)-to-face-centered cubic (FCC) transformation and dislocation activities within the strain-induced FCC phase. Both events reduce the stress concentration at the crack tip and retard crack propagation. Our research provides an approach for timely and atomic-resolved high-temperature mechanical investigation of materials at high-temperatures.

Date: 2021
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DOI: 10.1038/s41467-021-22447-y

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