Grain-boundary plane orientation dependence of faceting–roughening transition in Au grain boundaries under electron-beam irradiation

2021 ◽  
Vol 194 ◽  
pp. 113630
Author(s):  
Sung Bo Lee ◽  
Seung Jo Yoo ◽  
Jinwook Jung ◽  
Heung Nam Han
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Electron Beam Irradiation ◽  
Orientation Dependence ◽  
Boundary Plane ◽  
Beam Irradiation ◽  
Plane Orientation ◽  
Roughening Transition ◽  
Grain Boundary Plane

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

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sung Bo Lee ◽  
Heung Nam Han
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Current Density ◽  
Electron Beam Irradiation ◽  
Structural Evolution ◽  
Irradiation Effect ◽  
Beam Irradiation ◽  
Roughening Transition ◽  
Transmission Electron ◽  
Scattering Effects

AbstractIn 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 Cs-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.

Grain-boundary plane orientation dependence of electrical barriers at Σ5 boundaries in SrTiO3

2008 ◽  
Vol 56 (18) ◽  
pp. 4993-4997 ◽  
Author(s):  
Sung Bo Lee ◽  
Jong-Heun Lee ◽  
Yoon-Ho Cho ◽  
Doh-Yeon Kim ◽  
Wilfried Sigle ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Orientation Dependence ◽  
Boundary Plane ◽  
Plane Orientation ◽  
Grain Boundary Plane

Increased mobility of an α-Al2O3 grain boundary by electron-beam irradiation

2017 ◽  
Vol 53 (4) ◽  
pp. 2383-2388 ◽  
Author(s):  
Sung Bo Lee ◽  
Seung-Yong Lee ◽  
Miyoung Kim ◽  
Heung Nam Han
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Α Al2o3

Grain Boundary Precipitate Density as a Function of Time and Misorientation in an Al-5 WT% Cu Alloy

1993 ◽  
Vol 319 ◽  
Author(s):  
M. A. Cantrell ◽  
G. J. Shiflet
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Treatment Time ◽  
Boundary Plane ◽  
Heat Treatment Time ◽  
Boundary Structure ◽  
Plane Orientation ◽  
Cu Alloy ◽  
Grain Boundary Plane ◽  
Precipitate Density

AbstractThe variation of θ (CuAI2) precipitate density as a function of heat treatment time and grain boundary misorientation was investigated in an Al-5 wt % Cu alloy. In this study, precipitate densities have been quantitatively linked to grain boundary structure. It was found that, for a given heat treatment time, the precipitate density varied in a reproducible manner (108 to 1010 ppts/cm2) as a function of misorientation between the grains (20 to 60 degrees). Additionally, misorientation was found to be the most important factor governing the precipitate density at a given grain boundary. The grain boundary plane orientation played a secondary role in determining the precipitate density. Bollmann O-lattice modeling allows comparison of the relative effects of grain boundary plane orientation relative to the misorientation between grains.

The structure of a near Σ=27 tilt grain boundary in Ge

1992 ◽  
Vol 50 (1) ◽  
pp. 214-215
Author(s):  
Stuart McKernan ◽  
C. Barry Carter
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Structural Unit ◽  
Perfect Crystal ◽  
Boundary Plane ◽  
Boundary Structure ◽  
Structural Units ◽  
Grain Boundary Plane ◽  
Grain Boundary Structure ◽  
Complex Structural

The modeling of tilt grain boundaries in terms of repeating structural units of varying separation is now a well established concept. High-resolution electron microscope (HREM) images of different tilt grain boundaries in many materials display a qualitative similarity of atomic configurations of the grain boundary structure. These boundaries are frequently described in terms of characteristic structural units, which may be separated from each other by regions of ‘perfect’ crystal (as, for example, in low-angle grain boundaries), or may be contiguous, forming ordered arrays of the structural units along the boundary. In general there will be a different arrangement of the structural units or an arrangement of different structural units, according to the precise geometry of the particular grain boundary. The structure of some special grain boundaries has been examined and these are found to exist in several different configurations, depending on the orientation of the grain boundary plane among other parameters. Symmetry-related symmetric tilt grain boundaries and asymmetric tilt grain boundaries with one grain having a prominent, low-index facet, are commonly observed, low-energy configurations. Structural multiplicity of these configurations along the same grain boundary has been observed in some systems. Defects in the perfect ordering of the structural units may be caused by deviations of the grain boundary plane away from the perfect tilt orientation. Deviations of grain boundary structure away from the exact orientation will also produce defects in the repeating structural unit configuration. These deviations may have a regular and well-defined structure, producing a more complex structural unit.

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