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Title: Formation of helium-bubble networks in tungsten

Abstract

The nucleation and subsequent growth of helium bubbles in bulk tungsten is investigated using molecular dynamics simulations. By considering a setting that includes the diffusion process of helium clusters, we study their attachment to existing bubbles and their interaction with tungsten crowdion structures generated in the bubble growth process. We find that incoming helium atoms, and especially small helium clusters, can become trapped in the crowdion structures, providing nucleation sites for new helium bubbles, and leading to a distributed network of bubbles rather than a single, growing bubble. The nature of this network depends on both the temperature and the implantation flux of helium. Our results indicate that the kinetic interaction of He with generated dislocations is a key factor dictating the evolution of bubble distributions in plasma-exposed tungsten.

Authors:
ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
Oak Ridge National Laboratory, Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1543506
DOE Contract Number:  
AC02-05CH11231; AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 159; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Materials Science; Metallurgy & Metallurgical Engineering

Citation Formats

Sandoval, Luis, Perez, Danny, Uberuaga, Blas P., and Voter, Arthur F. Formation of helium-bubble networks in tungsten. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.07.075.
Sandoval, Luis, Perez, Danny, Uberuaga, Blas P., & Voter, Arthur F. Formation of helium-bubble networks in tungsten. United States. doi:10.1016/j.actamat.2018.07.075.
Sandoval, Luis, Perez, Danny, Uberuaga, Blas P., and Voter, Arthur F. Mon . "Formation of helium-bubble networks in tungsten". United States. doi:10.1016/j.actamat.2018.07.075.
@article{osti_1543506,
title = {Formation of helium-bubble networks in tungsten},
author = {Sandoval, Luis and Perez, Danny and Uberuaga, Blas P. and Voter, Arthur F.},
abstractNote = {The nucleation and subsequent growth of helium bubbles in bulk tungsten is investigated using molecular dynamics simulations. By considering a setting that includes the diffusion process of helium clusters, we study their attachment to existing bubbles and their interaction with tungsten crowdion structures generated in the bubble growth process. We find that incoming helium atoms, and especially small helium clusters, can become trapped in the crowdion structures, providing nucleation sites for new helium bubbles, and leading to a distributed network of bubbles rather than a single, growing bubble. The nature of this network depends on both the temperature and the implantation flux of helium. Our results indicate that the kinetic interaction of He with generated dislocations is a key factor dictating the evolution of bubble distributions in plasma-exposed tungsten.},
doi = {10.1016/j.actamat.2018.07.075},
journal = {Acta Materialia},
issn = {1359-6454},
number = C,
volume = 159,
place = {United States},
year = {2018},
month = {10}
}