Suppression of vacancy cluster growth in concentrated solid solution alloys
Abstract
Large vacancy clusters, such as stacking-fault tetrahedra, are detrimental vacancy-type defects in ion-irradiated structural alloys. Suppression of vacancy cluster formation and growth is highly desirable to improve the irradiation tolerance of these materials. In this paper, we demonstrate that vacancy cluster growth can be inhibited in concentrated solid solution alloys by modifying cluster migration pathways and diffusion kinetics. The alloying effects of Fe and Cr on the migration of vacancy clusters in Ni concentrated alloys are investigated by molecular dynamics simulations and ion irradiation experiment. While the diffusion coefficients of small vacancy clusters in Ni-based binary and ternary solid solution alloys are higher than in pure Ni, they become lower for large clusters. This observation suggests that large clusters can easily migrate and grow to very large sizes in pure Ni. In contrast, cluster growth is suppressed in solid solution alloys owing to the limited mobility of large vacancy clusters. Finally, the differences in cluster sizes and mobilities in Ni and in solid solution alloys are consistent with the results from ion irradiation experiments.
- Authors:
-
[1];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1343528
- Alternate Identifier(s):
- OSTI ID: 1397785
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 125; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Molecular dynamics simulations; Ion irradiation; Concentrated solid-solution alloys; Ni-based alloys; Vacancy cluster; Stacking fault tetrahedron
Citation Formats
Zhao, Shijun, Velisa, Gihan, Xue, Haizhou, Bei, Hongbin, Weber, William J., and Zhang, Yanwen. Suppression of vacancy cluster growth in concentrated solid solution alloys. United States: N. p., 2016.
Web. doi:10.1016/j.actamat.2016.11.050.
Zhao, Shijun, Velisa, Gihan, Xue, Haizhou, Bei, Hongbin, Weber, William J., & Zhang, Yanwen. Suppression of vacancy cluster growth in concentrated solid solution alloys. United States. https://doi.org/10.1016/j.actamat.2016.11.050
Zhao, Shijun, Velisa, Gihan, Xue, Haizhou, Bei, Hongbin, Weber, William J., and Zhang, Yanwen. Tue .
"Suppression of vacancy cluster growth in concentrated solid solution alloys". United States. https://doi.org/10.1016/j.actamat.2016.11.050. https://www.osti.gov/servlets/purl/1343528.
@article{osti_1343528,
title = {Suppression of vacancy cluster growth in concentrated solid solution alloys},
author = {Zhao, Shijun and Velisa, Gihan and Xue, Haizhou and Bei, Hongbin and Weber, William J. and Zhang, Yanwen},
abstractNote = {Large vacancy clusters, such as stacking-fault tetrahedra, are detrimental vacancy-type defects in ion-irradiated structural alloys. Suppression of vacancy cluster formation and growth is highly desirable to improve the irradiation tolerance of these materials. In this paper, we demonstrate that vacancy cluster growth can be inhibited in concentrated solid solution alloys by modifying cluster migration pathways and diffusion kinetics. The alloying effects of Fe and Cr on the migration of vacancy clusters in Ni concentrated alloys are investigated by molecular dynamics simulations and ion irradiation experiment. While the diffusion coefficients of small vacancy clusters in Ni-based binary and ternary solid solution alloys are higher than in pure Ni, they become lower for large clusters. This observation suggests that large clusters can easily migrate and grow to very large sizes in pure Ni. In contrast, cluster growth is suppressed in solid solution alloys owing to the limited mobility of large vacancy clusters. Finally, the differences in cluster sizes and mobilities in Ni and in solid solution alloys are consistent with the results from ion irradiation experiments.},
doi = {10.1016/j.actamat.2016.11.050},
journal = {Acta Materialia},
number = ,
volume = 125,
place = {United States},
year = {Tue Dec 13 00:00:00 EST 2016},
month = {Tue Dec 13 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Unique Challenges for Modeling Defect Dynamics in Concentrated Solid-Solution Alloys
journal, July 2017
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Atomistic simulation of defect-dislocation interactions in concentrated solid-solution alloys
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Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys [Supplementary Data]
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