J. Mater. Sci. Technol. ›› 2024, Vol. 195: 208-217.DOI: 10.1016/j.jmst.2023.12.068

• Research Article • Previous Articles     Next Articles

In situ TEM study of pulse-enhanced plasticity of monatomic metallic glasses

Xing Lia,b,1, Youran Honga,b,1, Haibo Kec, Li Zhongd, Yu Zoue, Jiangwei Wanga,b,*   

  1. aCenter of Electron Microscopy, State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
    bWenzhou Key Laboratory of Novel Optoelectronic and Nano Materials, Institute of Wenzhou, Zhejiang University, Wenzhou 325006, China;
    cSongshan Lake Materials Laboratory, Dongguan 523808, China;
    dSEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 210096, China;
    eDepartment of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada
  • Received:2023-10-31 Revised:2023-12-03 Accepted:2023-12-05 Published:2024-10-01 Online:2024-02-23
  • Contact: *Center of Electron Microscopy, State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. E-mail address: jiangwei_wang@zju.edu.cn (J. Wang)
  • About author:1These authors contributed equally to this work.

Abstract: The electropulsing process can be used to tailor the microstructure and deformability of metallic glasses (MGs). Here, we report the microstructural origin of enhanced electroplasticity of monatomic Ta MG nanowires. Under electromechanical loading, the Ta MG nanowire exhibits improved ductility and obvious necking behavior. By evaluating the dynamic structural evolution via in situ diffraction, it is found that the atomic mobility in flow units of Ta MG can be improved significantly under the stimulation of pulse current, mainly through the athermal electron-atom interaction, which results in the fast annihilation of flow units and, thereby, fast structural relaxation. These structural evolution processes can help to eliminate the formation of the obvious shear band. These findings provide insight into the origin of electroplasticity in amorphous materials, which is of scientific and technological significance for the design and processing of a variety of MGs.

Key words: Metallic glass, Nanowire, Electromechanical loading, Flow units, Electroplasticity, Electrical pulse