Faceting-roughening transition of a Cu grain boundary under electron-beam irradiation at 300 keV

Sung Bo Lee; Heung Nam Han

doi:10.1038/s41598-021-95091-7

Faceting-roughening transition of a Cu grain boundary under electron-beam irradiation at 300 keV

Sci Rep. 2021 Jul 30;11(1):15563. doi: 10.1038/s41598-021-95091-7.

Authors

Sung Bo Lee¹, Heung Nam Han²

Affiliations

¹ Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea. bolee@snu.ac.kr.
² Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, 08826, South Korea.

Abstract

In this study, we examined the beam-irradiation effect on the structural evolution of the grain boundary (GB) in a Cu bicrystal at room temperature using a C_s-corrected, monochromated transmission electron microscope at an acceleration voltage of 300 keV. Faceting of the GB was observed at a low current density of the electron beam. With increasing current density, the GB became defaceted. The faceting-roughening transition was shown to be reversible, as the process was reversed upon decreasing the current density. The structural transition is explained by inelastic scattering effects by electron-beam irradiation.

Abstract

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