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Title: Examining the influence of grain size on radiation tolerance in the nanocrystalline regime

Abstract

Here, nanocrystalline materials have been proposed as superior radiation tolerant materials in comparison to coarse grain counterparts. However, there is still a limited understanding whether a particular nanocrystalline grain size is required to obtain significant improvements in key deleterious effects resulting from energetic irradiation. This work employs the use of in-situ heavy ion irradiation transmission electron microscopy experiments coupled with quantitative defect characterization and precession electron diffraction to explore the sensitivity of defect size and density within the nanocrystalline regime in platinum. Under the explored experimental conditions, no significant change in either the defect size or density between grain sizes of 20 and 100 nm was observed. Furthermore, the in-situ transmission electron microscopy irradiations illustrate stable sessile defect clusters of 1-3 nm adjacent to most grain boundaries, which are traditionally treated as strong defect sinks. The stability of these sessile defects observed in-situ in small, 20-40 nm, grains is the proposed primary mechanism for a lack of defect density trends. Lastly, this scaling breakdown in radiation improvement with decreasing grain size has practical importance on nanoscale grain boundary engineering approaches for proposed radiation tolerant alloys.

Authors:
 [1]; ORCiD logo [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Material, Physical, and Chemical Sciences
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1479967
Alternate Identifier(s):
OSTI ID: 1435481; OSTI ID: 1441471
Report Number(s):
LA-UR-18-29343; SAND-2018-4283J
Journal ID: ISSN 0003-6951
Grant/Contract Number:  
AC04-94AL85000; AC52-06NA25396; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 18; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Barr, Christopher M., Li, Nan, Boyce, Brad L., and Hattar, Khalid. Examining the influence of grain size on radiation tolerance in the nanocrystalline regime. United States: N. p., 2018. Web. doi:10.1063/1.5016822.
Barr, Christopher M., Li, Nan, Boyce, Brad L., & Hattar, Khalid. Examining the influence of grain size on radiation tolerance in the nanocrystalline regime. United States. https://doi.org/10.1063/1.5016822
Barr, Christopher M., Li, Nan, Boyce, Brad L., and Hattar, Khalid. Mon . "Examining the influence of grain size on radiation tolerance in the nanocrystalline regime". United States. https://doi.org/10.1063/1.5016822. https://www.osti.gov/servlets/purl/1479967.
@article{osti_1479967,
title = {Examining the influence of grain size on radiation tolerance in the nanocrystalline regime},
author = {Barr, Christopher M. and Li, Nan and Boyce, Brad L. and Hattar, Khalid},
abstractNote = {Here, nanocrystalline materials have been proposed as superior radiation tolerant materials in comparison to coarse grain counterparts. However, there is still a limited understanding whether a particular nanocrystalline grain size is required to obtain significant improvements in key deleterious effects resulting from energetic irradiation. This work employs the use of in-situ heavy ion irradiation transmission electron microscopy experiments coupled with quantitative defect characterization and precession electron diffraction to explore the sensitivity of defect size and density within the nanocrystalline regime in platinum. Under the explored experimental conditions, no significant change in either the defect size or density between grain sizes of 20 and 100 nm was observed. Furthermore, the in-situ transmission electron microscopy irradiations illustrate stable sessile defect clusters of 1-3 nm adjacent to most grain boundaries, which are traditionally treated as strong defect sinks. The stability of these sessile defects observed in-situ in small, 20-40 nm, grains is the proposed primary mechanism for a lack of defect density trends. Lastly, this scaling breakdown in radiation improvement with decreasing grain size has practical importance on nanoscale grain boundary engineering approaches for proposed radiation tolerant alloys.},
doi = {10.1063/1.5016822},
journal = {Applied Physics Letters},
number = 18,
volume = 112,
place = {United States},
year = {Mon Apr 30 00:00:00 EDT 2018},
month = {Mon Apr 30 00:00:00 EDT 2018}
}

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Cited by: 21 works
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Works referencing / citing this record:

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