Size-Tuned Plastic Flow Localization in Irradiated Materials at the Submicron Scale
Abstract
Three-dimensional discrete dislocation dynamics (3D-DDD) simulations reveal that, with reduction of sample size in the submicron regime, the mechanism of plastic flow localization in irradiated materials transitions from irradiation-controlled to an intrinsic dislocation source controlled. Furthermore, the spatial correlation of plastic deformation decreases due to weaker dislocation interactions and less frequent cross slip as the system size decreases, thus manifesting itself in thinner dislocation channels. A simple model of discrete dislocation source activation coupled with cross slip channel widening is developed to reproduce and physically explain this transition. In order to quantify the phenomenon of plastic flow localization, we introduce a “deformation localization index,” with implications to the design of radiation-resistant materials.
- Authors:
-
- Univ. of California, Los Angeles, CA (United States). Mechanical and Aerospace Engineering Dept.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1541320
- Alternate Identifier(s):
- OSTI ID: 1438291
- Grant/Contract Number:
- SC0018410
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 21; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Cui, Yinan, Po, Giacomo, and Ghoniem, Nasr. Size-Tuned Plastic Flow Localization in Irradiated Materials at the Submicron Scale. United States: N. p., 2018.
Web. doi:10.1103/physrevlett.120.215501.
Cui, Yinan, Po, Giacomo, & Ghoniem, Nasr. Size-Tuned Plastic Flow Localization in Irradiated Materials at the Submicron Scale. United States. https://doi.org/10.1103/physrevlett.120.215501
Cui, Yinan, Po, Giacomo, and Ghoniem, Nasr. Tue .
"Size-Tuned Plastic Flow Localization in Irradiated Materials at the Submicron Scale". United States. https://doi.org/10.1103/physrevlett.120.215501. https://www.osti.gov/servlets/purl/1541320.
@article{osti_1541320,
title = {Size-Tuned Plastic Flow Localization in Irradiated Materials at the Submicron Scale},
author = {Cui, Yinan and Po, Giacomo and Ghoniem, Nasr},
abstractNote = {Three-dimensional discrete dislocation dynamics (3D-DDD) simulations reveal that, with reduction of sample size in the submicron regime, the mechanism of plastic flow localization in irradiated materials transitions from irradiation-controlled to an intrinsic dislocation source controlled. Furthermore, the spatial correlation of plastic deformation decreases due to weaker dislocation interactions and less frequent cross slip as the system size decreases, thus manifesting itself in thinner dislocation channels. A simple model of discrete dislocation source activation coupled with cross slip channel widening is developed to reproduce and physically explain this transition. In order to quantify the phenomenon of plastic flow localization, we introduce a “deformation localization index,” with implications to the design of radiation-resistant materials.},
doi = {10.1103/physrevlett.120.215501},
journal = {Physical Review Letters},
number = 21,
volume = 120,
place = {United States},
year = {Tue May 22 00:00:00 EDT 2018},
month = {Tue May 22 00:00:00 EDT 2018}
}
Web of Science
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Works referencing / citing this record:
Influence of Size on the Fractal Dimension of Dislocation Microstructure
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