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The radiation-induced swelling of simple Fe-Cr-Ni austenitic alloys is known to be very sensitive to solute additions. It is shown in this paper that three of the most common solute elements (P,Si,Mo) exert a very complex and often non-monotonic influence on swelling with increasing solute level. The complexity of this influence and its dependence on other variables appears to be the result of a closely balanced competition between two or more roles played by each solute in its interaction with both vacancies and interstitials. This competition yields a variety of different swelling behaviors in response to changes in solute or solvent composition, displacement rate, and irradiation temperature.
Fe-Cr-Ni alloys, void swelling, atomic size difference, silicon, molybdenum, phosphorus, neutron irradiation, ion irradiation
Staff Scientist, Pacific Northwest Laboratory, Richland, WA
Senior Engineer, General Electric Corporation, Sunnyvale, CA
Graduate Student, University of Illinois, Urbana, IL