An In Situ Transmission Electron Microscopy Study on the Synergistic Effects of Au-ion Irradiation and High Temperature on Nuclear Graphite Microstructure

Thomas, Melonie; Schoell, Ryan; Rasel, Md Jafar; Rahman, Md; Kuo, Winson; Watt, John; House, Stephen; Hattar, Khalid; Windes, William; Haque, Aman

doi:10.1088/2053-1591/ad37a6

Title: An In Situ Transmission Electron Microscopy Study on the Synergistic Effects of Au-ion Irradiation and High Temperature on Nuclear Graphite Microstructure

Journal Article · 24 March 2024 · Materials Research Express (Online)

DOI: https://doi.org/10.1088/2053-1591/ad37a6 · OSTI ID:2332795

^[1]; Schoell, Ryan ^[2]; Rasel, Md Jafar ^[1]; Rahman, Md ^[1]; Kuo, Winson ^[3];

^[3]; House, Stephen ^[2]; Hattar, Khalid ^[4]; Windes, William ^[5];

^[1]

Pennsylvania State Univ., University Park, PA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

The combined effect of high-temperature and heavy-ion irradiation on Mrozowski cracks (MC) and nuclear graphite crystallographic dimensions have been studied using in situ heating and in situ ion-irradiation in the transmission electron microscope (TEM). Electron transparent lamella of nuclear graphite, IG-110, was irradiated, using a 2.8 MeV Au beam at an ion flux of 3.991 x 1010 ion cm^-2 s^-1 for 70 minutes at 800 ^oC. Upon high-temperature irradiation, Mrozowski crack closure was studied quantitatively. The analysis showed linear, positive expansion of nuclear graphite which is significantly different from the dimensional changes previously reported for low-dose neutron irradiation of nuclear graphite in which the material undergoes negative to positive expansion via a turnaround radiation dose. The trend of the thermal expansion coefficient (CTE) of pristine IG-110 in this study is consistent with previous reports in the 100-800 ^oC temperature region in which the dimensional change ranges from negative to positive values.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; NE0009129; NA0003525

OSTI ID:: 2332795

Alternate ID(s):: OSTI ID: 2328167; OSTI ID: 2335406

Report Number(s):: LA-UR--23-32936; {"","Journal ID: ISSN 2053-1591"}

Journal Information:: Materials Research Express (Online), Journal Name: Materials Research Express (Online) Journal Issue: 4 Vol. 11; ISSN 2053-1591

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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material science
layered solids
graphite
heavy ion irradiation
thermal expansion coefficient
Mrozowski cracks
in situ transmission electron microscopy

Title: An In Situ Transmission Electron Microscopy Study on the Synergistic Effects of Au-ion Irradiation and High Temperature on Nuclear Graphite Microstructure

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