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Effect of Carbon Impurity Content on Microstructural Evolution in Neutron-Irradiated Alpha Iron: Cluster Dynamics Modeling

Published online by Cambridge University Press:  05 April 2013

Yosuke Abe ,
Tomohito Tsuru  and
Shiro Jitsukawa
Yosuke Abe
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-Mura, Ibaraki, 319-1195, Japan
Tomohito Tsuru
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-Mura, Ibaraki, 319-1195, Japan
Shiro Jitsukawa
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, 2-4 Shirakata-shirane, Tokai-Mura, Ibaraki, 319-1195, Japan Mechanical and Electrical System Engineering, Fukushima National College of Technology, 30 Nagao, Taira-Kamiarakawa, Iwaki, Fukushima, 970-8034, Japan
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Abstract

Cluster dynamics (CD) modeling has been used to estimate the long-term evolution of point defect (PD) clusters. However, previous studies have often simplified the governing equations by assuming the maximum size of mobile self-interstitial atom (SIA) clusters and by ignoring the one-dimensional (1D) reaction kinetics of SIA loops. They have also conducted parameter fittings, such as the clustered fraction and the maximum size of clusters produced by collision cascade, to reproduce experimental data. In this study, in addition to modeling the 1D motion of SIA loops in the framework of the production bias model (PBM), reaction rates associated with carbon impurity atoms present in alpha iron were formulated to consider the trapping effect of one-dimensionally migrating SIA loops by a vacancy-carbon (V-C) complex that was shown to have strong bindings with SIA loops by previous atomistic simulations. Calculations results for neutron-irradiated alpha iron showed that the developed CD model can successfully reproduce the saturation trend of the number density of immobile SIA loops in contrast to the prediction using a model without the trapping effect.

Keywords

nuclear materialsradiation effectssimulation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1535: Symposium a – Proceedings of the Multiscale Materials Modeling 2012 Conference , 2013 , mmm2012-a-0330
Copyright
Copyright © Materials Research Society 2013 

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