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Journal article
Achieving Radiation Tolerance through Non-Equilibrium Grain Boundary Structures
Scientific reports, v 7(1), 12275
25 Sep 2017
PMID: 28947751
Abstract
Many methods used to produce nanocrystalline (NC) materials leave behind non-equilibrium grain boundaries (GBs) containing excess free volume and higher energy than their equilibrium counterparts with identical 5 degrees of freedom. Since non-equilibrium GBs have increased amounts of both strain and free volume, these boundaries may act as more efficient sinks for the excess interstitials and vacancies produced in a material under irradiation as compared to equilibrium GBs. The relative sink strengths of equilibrium and non-equilibrium GBs were explored by comparing the behavior of annealed (equilibrium) and as-deposited (non-equilibrium) NC iron films on irradiation. These results were coupled with atomistic simulations to better reveal the underlying processes occurring on timescales too short to capture using in situ TEM. After irradiation, NC iron with non-equilibrium GBs contains both a smaller number density of defect clusters and a smaller average defect cluster size. Simulations showed that excess free volume contribute to a decreased survival rate of point defects in cascades occurring adjacent to the GB and that these boundaries undergo less dramatic changes in structure upon irradiation. These results suggest that non-equilibrium GBs act as more efficient sinks for defects and could be utilized to create more radiation tolerant materials in future.
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Details
- Title
- Achieving Radiation Tolerance through Non-Equilibrium Grain Boundary Structures
- Creators
- Gregory A. Vetterick - Drexel UniversityJacob Gruber - Drexel UniversityPranav K. Suri - Drexel UniversityJon K. Baldwin - Los Alamos National LaboratoryMarquis A. Kirk - Argonne National LaboratoryPete Baldo - Argonne National LaboratoryYong Q. Wang - Los Alamos National LaboratoryAmit Misra - Los Alamos National LaboratoryGarritt J. Tucker - Drexel UniversityMitra L. Taheri - Drexel UniversityDrexel Univ., Philadelphia, PA (United States)
- Publication Details
- Scientific reports, v 7(1), 12275
- Publisher
- Springer Nature
- Number of pages
- 9
- Grant note
- National Science Foundation through a Graduate Assistance in Areas of National Need (GAANN) fellowship DE-SC0008274 / Department of Energy, Basic Energy Sciences; United States Department of Energy (DOE) 1748130 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) DMR-1410970 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pediatrics
- Web of Science ID
- WOS:000411648500049
- Scopus ID
- 2-s2.0-85029894441
- Other Identifier
- 991019169647804721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary