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Title: A novel approach to quantifying the kinetics of point defect absorption at dislocations

Abstract

We report that microstructure evolution under creep loading and/or irradiation is largely affected by the two-way coupling between dislocation induced plasticity and point defect diffusion as mediated by the internal elastic strain field within the medium. The magnitude of this effect has been quantified only in idealized, simplified environments such that estimates of absorption rates of point defects to dislocations ignore the collective effects on capture rates arising from particular distribution of dislocations in a given network, the interaction of point defects with the internal strain, or in many cases both. To quantify these effects, we advance a novel methodology to determine point defect capture rates locally within a spatially resolved finite difference solution to the diffusion problem for arbitrarily directed dislocations and the corresponding strain fields. In addition to examining the effects of these couplings on local and effective absorption rates of dislocation networks, the potential consequences of these interactions on other microstructure evolution phenomena are examined using void swelling under irradiation as an example. Our study indicates that local rates of defect mediated microstructural changes such as cavity growth can vary strongly as a consequence of the arrangement of the dislocation network and the corresponding strain state. Lastly,more » the heterogeneous aspects of the resultant defect populations are shown to provide mechanisms for microstructural evolution under irradiation that are not available in the conventional homogeneous theory.« less

Authors:
 [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1477664
Report Number(s):
LA-UR-18-24458
Journal ID: ISSN 0022-5096
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Mechanics and Physics of Solids
Additional Journal Information:
Journal Volume: 122; Journal Issue: C; Journal ID: ISSN 0022-5096
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Point defects; Internal strain; Irradiated metals

Citation Formats

Kohnert, Aaron Anthony, and Capolungo, Laurent. A novel approach to quantifying the kinetics of point defect absorption at dislocations. United States: N. p., 2018. Web. doi:10.1016/j.jmps.2018.08.023.
Kohnert, Aaron Anthony, & Capolungo, Laurent. A novel approach to quantifying the kinetics of point defect absorption at dislocations. United States. doi:10.1016/j.jmps.2018.08.023.
Kohnert, Aaron Anthony, and Capolungo, Laurent. Thu . "A novel approach to quantifying the kinetics of point defect absorption at dislocations". United States. doi:10.1016/j.jmps.2018.08.023. https://www.osti.gov/servlets/purl/1477664.
@article{osti_1477664,
title = {A novel approach to quantifying the kinetics of point defect absorption at dislocations},
author = {Kohnert, Aaron Anthony and Capolungo, Laurent},
abstractNote = {We report that microstructure evolution under creep loading and/or irradiation is largely affected by the two-way coupling between dislocation induced plasticity and point defect diffusion as mediated by the internal elastic strain field within the medium. The magnitude of this effect has been quantified only in idealized, simplified environments such that estimates of absorption rates of point defects to dislocations ignore the collective effects on capture rates arising from particular distribution of dislocations in a given network, the interaction of point defects with the internal strain, or in many cases both. To quantify these effects, we advance a novel methodology to determine point defect capture rates locally within a spatially resolved finite difference solution to the diffusion problem for arbitrarily directed dislocations and the corresponding strain fields. In addition to examining the effects of these couplings on local and effective absorption rates of dislocation networks, the potential consequences of these interactions on other microstructure evolution phenomena are examined using void swelling under irradiation as an example. Our study indicates that local rates of defect mediated microstructural changes such as cavity growth can vary strongly as a consequence of the arrangement of the dislocation network and the corresponding strain state. Lastly, the heterogeneous aspects of the resultant defect populations are shown to provide mechanisms for microstructural evolution under irradiation that are not available in the conventional homogeneous theory.},
doi = {10.1016/j.jmps.2018.08.023},
journal = {Journal of the Mechanics and Physics of Solids},
number = C,
volume = 122,
place = {United States},
year = {2018},
month = {9}
}

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