Irradiation creep is known to be an important process for structural materials in nuclear environments, potentially leading to creep failure at temperatures where thermal creep is generally negligible. While there is a great deal of data for irradiation creep in steels and zirconium alloys in light water reactor conditions, much less is known for first wall materials under fusion energy conditions. Lacking suitable fusion neutron sources for detailed experimentation, modeling, and simulation can help bridge the dose-rate and spectral-effects gap and produce quantifiable expectations for creep deformation of first wall materials under standard fusion conditions. In this paper, we develop a comprehensive model for irradiation creep created from merging a crystal plasticity representation of the dislocation microstructure and a defect evolution simulator that accounts for the entire cluster dimensionality space. Both approaches are linked by way of a climb velocity that captures dislocation-biased defect absorption and a dislocation strengthening term that reflects the accumulation of defect clusters in the system. We carry out our study in Fe under first wall fusion reactor conditions, characterized by a fusion neutron spectrum with average recoil energies of 20 keV and a damage dose rate of dpa/s at temperatures between 300 and 800 K.
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14 December 2022
Research Article|
December 08 2022
Physics-based model of irradiation creep for ferritic materials under fusion energy operation conditions
Special Collection:
Radiation Effects in Materials
Qianran Yu
;
Qianran Yu
(Data curation, Formal analysis, Methodology, Software, Validation, Writing – original draft, Writing – review & editing)
1
Department of Mechanical and Aerospace Engineering, University of California
, Los Angeles, California 90095, USA
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Giacomo Po
;
Giacomo Po
(Supervision, Writing – review & editing)
2
Mechanical and Aerospace Engineering Department, Univercity of Miami
, Coral Gables, Florida 22146, USA
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Jaime Marian
Jaime Marian
a)
(Conceptualization, Formal analysis, Funding acquisition, Methodology, Project administration, Resources, Supervision, Writing – original draft, Writing – review & editing)
3
Department of Materials Science and Engineering, University of California
, Los Angeles, California 90095, USA
a)Author to whom correspondence should be addressed: jmarian@g.ucla.edu
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a)Author to whom correspondence should be addressed: jmarian@g.ucla.edu
Note: This paper is part of the Special Topic on Radiation Effects in Materials.
J. Appl. Phys. 132, 225101 (2022)
Article history
Received:
June 01 2022
Accepted:
November 16 2022
Citation
Qianran Yu, Giacomo Po, Jaime Marian; Physics-based model of irradiation creep for ferritic materials under fusion energy operation conditions. J. Appl. Phys. 14 December 2022; 132 (22): 225101. https://doi.org/10.1063/5.0101561
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