Evolution of dislocation loops and voids in post-irradiation annealed ThO2: A combined in-situ TEM and cluster dynamics investigation

Mazumder, Sanjoy Kumar; Bawane, Kaustubh Krishna; Mann, J. Matthew; French, Aaron; Shao, Lin; He, Lingfeng; El-Azab, Anter

doi:10.1016/j.jnucmat.2023.154686

Title: Evolution of dislocation loops and voids in post-irradiation annealed ThO₂: A combined in-situ TEM and cluster dynamics investigation

Journal Article · Wed Aug 16 00:00:00 EDT 2023 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2023.154686· OSTI ID:2290348

Mazumder, Sanjoy Kumar ^[1]; Bawane, Kaustubh Krishna ^[2]; Mann, J. Matthew ^[3];

^[4]; Shao, Lin ^[4]; He, Lingfeng ^[5]; El-Azab, Anter ^[1]

Purdue Univ., West Lafayette, IN (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
Texas A & M Univ., College Station, TX (United States)
North Carolina State University, Raleigh, NC (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)

The effect of isochronal annealing on the evolution of dislocation loop and void population in proton irradiated ThO₂ has been investigated. Post-irradiation annealing in other actinide oxides like UO₂ shows significant loop coarsening. ThO₂ samples were irradiated with 2 MeV protons up to a dose of 0.1 dpa at 600°C. Post-irradiation isochronal annealing was performed at 600, 800, 1000 and 1100°C for 1 h at each temperature using in-situ TEM. Only faulted 1/3<111> type dislocation loops were observed, and their sizes and distribution were characterized. Further, the population of self-interstitial atom (SIA) dislocation loops did not show any significant growth and coarsening. Additionally, nanometric voids were observed at annealing temperatures of 1000 and 1100°C. Using cluster dynamics (CD), we have studied the nucleation and growth of point defects and defect clusters, i.e., SIA prismatic dislocation loops and nanometric and sub-nanometric voids in proton irradiated ThO₂. The CD model was further utilized to predict the growth and coarsening of loops and voids during isochronal annealing at the experimental and higher temperatures. The model did not predict significant SIA loop growth which closely corresponds to the TEM observations. CD predicted SIA loop coarsening is insignificant even at high annealing temperature of 1500°C because the model only considers the growth of defect clusters by absorption of like point defects, i.e., SIA loops absorb interstitials and voids absorb vacancies, and cannot account for their migration and coalescence due to elastic interaction. The CD model also predicts the evolution of nanometric voids having mean size within the error bounds of TEM observations.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Thermal Energy Transport under Irradiation (TETI)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2290348

Alternate ID(s):: OSTI ID: 1996892

Report Number(s):: INL/JOU-23-72078-Rev000

Journal Information:: Journal of Nuclear Materials, Vol. 586, Issue -; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Evolution of dislocation loops and voids in post-irradiation annealed ThO2: A combined in-situ TEM and cluster dynamics investigation

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Title: Evolution of dislocation loops and voids in post-irradiation annealed ThO₂: A combined in-situ TEM and cluster dynamics investigation