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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5016822· OSTI ID:1479967
 [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)

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
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)
Grant/Contract Number:
AC04-94AL85000; AC52-06NA25396; NA0003525
OSTI ID:
1479967
Alternate ID(s):
OSTI ID: 1435481; OSTI ID: 1441471
Report Number(s):
LA-UR-18-29343; SAND-2018-4283J
Journal Information:
Applied Physics Letters, Vol. 112, Issue 18; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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In situ TEM investigation of self-ion irradiation of nanoporous gold journal January 2019
Effect of carbon nanotube on radiation resistance of CNT-Cu nanocomposite: MD simulation journal December 2019
Interplay Between Grain Boundaries and Radiation Damage journal March 2019
Listening to Radiation Damage In Situ: Passive and Active Acoustic Techniques journal November 2019
Defect‐fluorite Gd 2 Zr 2 O 7 ceramics under helium irradiation: Amorphization, cell volume expansion, and multi‐stage bubble formation journal February 2019