Revealing the pulse-induced electroplasticity by decoupling electron wind force

Xing Li, Qi Zhu, Youran Hong, He Zheng, Jian Wang, Jiangwei Wang () and Ze Zhang ()
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Xing Li: Zhejiang University
Qi Zhu: Zhejiang University
Youran Hong: Zhejiang University
He Zheng: Wuhan University
Jian Wang: University of Nebraska-Lincoln
Jiangwei Wang: Zhejiang University
Ze Zhang: Zhejiang University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Micro/nano electromechanical systems and nanodevices often suffer from degradation under electrical pulse. However, the origin of pulse-induced degradation remains an open question. Herein, we investigate the defect dynamics in Au nanocrystals under pulse conditions. By decoupling the electron wind force via a properly-designed in situ TEM electropulsing experiment, we reveal a non-directional migration of Σ3{112} incoherent twin boundary upon electropulsing, in contrast to the expected directional migration under electron wind force. Quantitative analyses demonstrate that such exceptional incoherent twin boundary migration is governed by the electron-dislocation interaction that enhances the atom vibration at dislocation cores, rather than driven by the electron wind force in classic model. Our observations provide valuable insights into the origin of electroplasticity in metallic materials at the atomic level, which are of scientific and technological significances to understanding the electromigration and resultant electrical damage/failure in micro/nano-electronic devices.

Date: 2022
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DOI: 10.1038/s41467-022-34333-2

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