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, Xiaodong Han

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

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.

Original languageEnglish
Article number2218
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - 1 Dec 2021

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