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Nucleation and growth of helium bubble at (110) twist grain boundaries in tungsten studied by molecular dynamics*
- Source :
- Chinese Physics B. 28:085203
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- Migration of He atoms and growth of He bubbles in high angle twist grain boundaries (HAGBs) in tungsten (W) are investigated by atomic simulation method. The energy and free volume (FV) of grain boundary (GB) are affected by the density and structure of dislocation patterns in GB. The migration energy of the He atom between the neighboring trapping sites depends on free volume along the migration path at grain boundary. The region of grain boundary around the He bubble forms an ordered crystal structure when He bubble grows at certain grain boundaries. The He atoms aggregate on the grain boundary plane to form a plate-shape configuration. Furthermore, high grain boundary energy (GBE) results in a large volume of He bubble. Thus, the nucleation and growth of He bubbles in twist grain boundaries depend on the energy of grain boundary, the dislocation patterns and the free volume related migration path on the grain boundary plane.
- Subjects :
- Materials science
Condensed matter physics
Plane (geometry)
Bubble
Nucleation
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
Tungsten
021001 nanoscience & nanotechnology
01 natural sciences
chemistry
0103 physical sciences
Atom
Grain boundary
Dislocation
010306 general physics
0210 nano-technology
Helium
Subjects
Details
- ISSN :
- 16741056
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Chinese Physics B
- Accession number :
- edsair.doi...........5455f3ca4e8ab101cec25954868c4364
- Full Text :
- https://doi.org/10.1088/1674-1056/28/8/085203