SYMPOSIA PAPER Published: 01 January 1982
STP34399S

Asymmetric Dislocation/Point-Defect Interactions and the Modeling of Void Swelling

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An internally consistent model has been developed for analyzing void swelling during irradiation. The model employs Wigner-Seitz cells around each type of sink, namely dislocation lines, voids, and grain boundaries. Uniform generation of vacancies and interstitials is accounted for, as is diffusion in response to both concentration and radial interaction field gradients. The cells are coupled by equating concentrations and current flows at their peripheries, for arbitrary densities of the various types of sinks.

A procedure has been developed for obtaining the “best” radial interaction fields to replace the actual angularly dependent ones surrounding dislocations. Analytical theoretical support for the chosen value (−1/4 of the average of the square of the actual field) has been developed. Quantitative accuracy has been assessed by comparison with numerical studies employing full angular dependence.

The predicted swelling-rate bias factor of ∼50% is in excellent agreement with available swelling-rate data when one assumes that ∼16% of the defects initially generated escape close-pair recombination within the cascade. Reasonable theoretical support exists for this survival fraction. However, quantitatively valid comparisons between theory and experiment must await further analysis.

Author Information

Liu, YY
Materials Science Division, Argonne National Laboratory, Argonne, IL
Nichols, FA
Materials Science Division, Argonne National Laboratory, Argonne, IL
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Details
Developed by Committee: E10
Pages: 1088–1102
DOI: 10.1520/STP34399S
ISBN-EB: 978-0-8031-4846-8
ISBN-13: 978-0-8031-0753-3