Microstructure-dependent rate theory model of defect segregation and phase stability in irradiated polycrystalline LiAlO2
Abstract
We report gamma lithium aluminate (LiAlO2) is a breeder material for tritium and is one of key components in a tritium-producing burnable absorber rod (TPBAR). Dissolution and precipitation of second phases such as LiAl5O8 and voids are observed in irradiated LiAlO2. Such microstructure changes cause the degradation of thermomechanical properties of LiAlO2 and affect tritium retention and release kinetics, and hence, the TPBAR performance. In this work, a microstructure-dependent model of radiation-induced segregation (RIS) has been developed for investigating the accumulation of species and phase stability in polycrystalline LiAlO2 structures under irradiation. Three sublattices (i.e. [Li, Al, V]I [O, Vo]II [Lii, Ali, Oi, Vi]III), and concentrations of six diffusive species (i.e. Li; vacancy of Li or Al at [Li, Al, V]I sublattice, O vacancy at [O, Vo]II sublattice, and Li, Al and O interstitials at [Lii, Ali, Oi, Vi]III interstitial sublattices; are used to describe spatial and temporal distributions of defects and chemistry. Microstructure-dependent thermodynamic and kinetic properties including the generation, reaction, and chemical potentials of defects and defect mobility are taken into account in the model. The parametric studies demonstrated the capability of the developed RIS model to assess the effect of thermodynamic and kinetic properties of defects onmore »
- Authors:
-
[1];
[1];
[2];
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Pennsylvania State University University Park, PA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1915261
- Report Number(s):
- PNNL-SA-148969
Journal ID: ISSN 0965-0393
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Modelling and Simulation in Materials Science and Engineering
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 2; Journal ID: ISSN 0965-0393
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; microstructure; rate theory; radiation-induced segregation; LiAlO
Citation Formats
Hu, Shenyang, Li, Yulan, Shang, Shunli, Liu, Zi-Kui, Burkes, Douglas, and Senor, David J. Microstructure-dependent rate theory model of defect segregation and phase stability in irradiated polycrystalline LiAlO2. United States: N. p., 2021.
Web. doi:10.1088/1361-651x/ac4001.
Hu, Shenyang, Li, Yulan, Shang, Shunli, Liu, Zi-Kui, Burkes, Douglas, & Senor, David J. Microstructure-dependent rate theory model of defect segregation and phase stability in irradiated polycrystalline LiAlO2. United States. https://doi.org/10.1088/1361-651x/ac4001
Hu, Shenyang, Li, Yulan, Shang, Shunli, Liu, Zi-Kui, Burkes, Douglas, and Senor, David J. Tue .
"Microstructure-dependent rate theory model of defect segregation and phase stability in irradiated polycrystalline LiAlO2". United States. https://doi.org/10.1088/1361-651x/ac4001. https://www.osti.gov/servlets/purl/1915261.
@article{osti_1915261,
title = {Microstructure-dependent rate theory model of defect segregation and phase stability in irradiated polycrystalline LiAlO2},
author = {Hu, Shenyang and Li, Yulan and Shang, Shunli and Liu, Zi-Kui and Burkes, Douglas and Senor, David J.},
abstractNote = {We report gamma lithium aluminate (LiAlO2) is a breeder material for tritium and is one of key components in a tritium-producing burnable absorber rod (TPBAR). Dissolution and precipitation of second phases such as LiAl5O8 and voids are observed in irradiated LiAlO2. Such microstructure changes cause the degradation of thermomechanical properties of LiAlO2 and affect tritium retention and release kinetics, and hence, the TPBAR performance. In this work, a microstructure-dependent model of radiation-induced segregation (RIS) has been developed for investigating the accumulation of species and phase stability in polycrystalline LiAlO2 structures under irradiation. Three sublattices (i.e. [Li, Al, V]I [O, Vo]II [Lii, Ali, Oi, Vi]III), and concentrations of six diffusive species (i.e. Li; vacancy of Li or Al at [Li, Al, V]I sublattice, O vacancy at [O, Vo]II sublattice, and Li, Al and O interstitials at [Lii, Ali, Oi, Vi]III interstitial sublattices; are used to describe spatial and temporal distributions of defects and chemistry. Microstructure-dependent thermodynamic and kinetic properties including the generation, reaction, and chemical potentials of defects and defect mobility are taken into account in the model. The parametric studies demonstrated the capability of the developed RIS model to assess the effect of thermodynamic and kinetic properties of defects on the segregation and depletion of species in polycrystalline structures and to explain the phase stability observed in irradiated LiAlO2 samples. The developed RIS model will be extended to study the precipitation of LiAl5O8 and voids and tritium retention by integrating the phase-field method.},
doi = {10.1088/1361-651x/ac4001},
journal = {Modelling and Simulation in Materials Science and Engineering},
number = 2,
volume = 30,
place = {United States},
year = {Tue Dec 21 00:00:00 EST 2021},
month = {Tue Dec 21 00:00:00 EST 2021}
}
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