New helium bubble growth mode at a symmetric grain-boundary in tungsten: accelerated molecular dynamics study
Abstract
This work, with an emphasis on helium irradiation rates appropriate for fusion-plasma conditions, advances the understanding of helium evolution at grain boundaries in W, an important consideration in the understanding of W as a plasma-facing component. Using accelerated molecular dynamics, helium bubble nucleation and growth at a symmetric Σ5[100](310) tilt grain-boundary in W is studied. The simulations reveal that the growth mode associated with bubble growth at the grain-boundary leads to a suppression of the helium supply to the bubble and hence to arrested growth. Such an unconventional bubble growth mode may dominate in materials with a high density of sinks.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1463492
- Report Number(s):
- LA-UR-18-21172
Journal ID: ISSN 2166-3831; TRN: US1902307
- Grant/Contract Number:
- AC52-06NA25396; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Research Letters
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 9; Journal ID: ISSN 2166-3831
- Publisher:
- Taylor and Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; helium bubble; tungsten; grain-boundaries; nucleation and growth; plasma-facing material
Citation Formats
Liu, X. -Y., Uberuaga, B. P., Perez, D., and Voter, A. F. New helium bubble growth mode at a symmetric grain-boundary in tungsten: accelerated molecular dynamics study. United States: N. p., 2018.
Web. doi:10.1080/21663831.2018.1494637.
Liu, X. -Y., Uberuaga, B. P., Perez, D., & Voter, A. F. New helium bubble growth mode at a symmetric grain-boundary in tungsten: accelerated molecular dynamics study. United States. https://doi.org/10.1080/21663831.2018.1494637
Liu, X. -Y., Uberuaga, B. P., Perez, D., and Voter, A. F. Sat .
"New helium bubble growth mode at a symmetric grain-boundary in tungsten: accelerated molecular dynamics study". United States. https://doi.org/10.1080/21663831.2018.1494637. https://www.osti.gov/servlets/purl/1463492.
@article{osti_1463492,
title = {New helium bubble growth mode at a symmetric grain-boundary in tungsten: accelerated molecular dynamics study},
author = {Liu, X. -Y. and Uberuaga, B. P. and Perez, D. and Voter, A. F.},
abstractNote = {This work, with an emphasis on helium irradiation rates appropriate for fusion-plasma conditions, advances the understanding of helium evolution at grain boundaries in W, an important consideration in the understanding of W as a plasma-facing component. Using accelerated molecular dynamics, helium bubble nucleation and growth at a symmetric Σ5[100](310) tilt grain-boundary in W is studied. The simulations reveal that the growth mode associated with bubble growth at the grain-boundary leads to a suppression of the helium supply to the bubble and hence to arrested growth. Such an unconventional bubble growth mode may dominate in materials with a high density of sinks.},
doi = {10.1080/21663831.2018.1494637},
journal = {Materials Research Letters},
number = 9,
volume = 6,
place = {United States},
year = {Sat Jul 07 00:00:00 EDT 2018},
month = {Sat Jul 07 00:00:00 EDT 2018}
}
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Cited by: 18 works
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Figures / Tables:
Figure 1: The atomic structure of the Σ5[001](310) tilt GB in W, viewed (a) along the tilt axis direction showing the typical ‘kite-like’ structural units at the GB region and (b) along the [130]grain1/[310]grain2 direction, highlighting the shift between the two grains in the lowest energy GB structure. (c) Amore »
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Works referencing / citing this record:
Atomistic simulations of helium, hydrogen, and self-interstitial diffusion inside dislocation cores in tungsten
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An Overview of Recent Standard and Accelerated Molecular Dynamics Simulations of Helium Behavior in Tungsten
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.