Modeling irradiation creep of graphite using rate theory
Abstract
In this work we examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) were analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. Here we show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 x 1022 n/cm2.
- Authors:
-
- North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1261400
- Alternate Identifier(s):
- OSTI ID: 1345241
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Nuclear Materials
- Additional Journal Information:
- Journal Volume: 473; Journal Issue: C; Journal ID: ISSN 0022-3115
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 36 MATERIALS SCIENCE; Graphite; Creep; Irradiation; Activation energy
Citation Formats
Sarkar, Apu, Eapen, Jacob, Raj, Anant, Murty, K. L., and Burchell, T. D. Modeling irradiation creep of graphite using rate theory. United States: N. p., 2016.
Web. doi:10.1016/j.jnucmat.2016.01.036.
Sarkar, Apu, Eapen, Jacob, Raj, Anant, Murty, K. L., & Burchell, T. D. Modeling irradiation creep of graphite using rate theory. United States. https://doi.org/10.1016/j.jnucmat.2016.01.036
Sarkar, Apu, Eapen, Jacob, Raj, Anant, Murty, K. L., and Burchell, T. D. Sat .
"Modeling irradiation creep of graphite using rate theory". United States. https://doi.org/10.1016/j.jnucmat.2016.01.036. https://www.osti.gov/servlets/purl/1261400.
@article{osti_1261400,
title = {Modeling irradiation creep of graphite using rate theory},
author = {Sarkar, Apu and Eapen, Jacob and Raj, Anant and Murty, K. L. and Burchell, T. D.},
abstractNote = {In this work we examined irradiation induced creep of graphite in the framework of transition state rate theory. Experimental data for two grades of nuclear graphite (H-337 and AGOT) were analyzed to determine the stress exponent (n) and activation energy (Q) for plastic flow under irradiation. Here we show that the mean activation energy lies between 0.14 and 0.32 eV with a mean stress-exponent of 1.0 ± 0.2. A stress exponent of unity and the unusually low activation energies strongly indicate a diffusive defect transport mechanism for neutron doses in the range of 3-4 x 1022 n/cm2.},
doi = {10.1016/j.jnucmat.2016.01.036},
journal = {Journal of Nuclear Materials},
number = C,
volume = 473,
place = {United States},
year = {Sat Feb 20 00:00:00 EST 2016},
month = {Sat Feb 20 00:00:00 EST 2016}
}
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Cited by: 3 works
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