Abstracts and Available Papers Presented at the
2000 International RERTR Meeting
A Theoretical Model for the Irradiation-Enhanced Interdiffusion of Al and U Alloys
J.
Rest,
Argonne National Laboratory,
9700 S. Cass Ave.,
Argonne, IL 60439, USA
Abstract
A model for the interdiffusion of Al and U alloys has been developed based on the premise that the generation of a high dislocation density leading to the formation of a cellular dislocation network provides a sufficient sink density in the material such that the sinks dominate defect behavior. The theoretical model thus derived has the following characteristics: 1. The effective interdiffusion coefficient is proportional to fission rate to the 3/4 power and exponentially dependent on temperature, 2. The interstitial migration enthalpy is given by ei-ev/2 =0.74eV , and 3. The model is consistent with uranium-silicide interdiffusion data if the vacancy migration enthalpy is »0.5eV. Finally, it is shown that the lack of SEM-resolvable bubbles in uranium aluminide is consistent with item 2, above, i.e.,ei-ev/2 > 0.
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Contact:
Jeffrey Rest
Argonne
National Laboratory
South
Cass Avenue, ET-212,
Argonne, IL 60439 USA
Phone: 1 630 252 5026
Fax: 1 630 252 4798
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