Subtask 12F2 [electronic resource] : Microstructural evolution of V-4Cr-4Ti during neutron irradiation

Published: Argonne, Ill. : Argonne National Laboratory, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description: pages 131-138 : digital, PDF file
Additional Creators: Argonne National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

The objective of this work is to characterize the microstructural evolution of V-4Cr-4Ti alloy during irradiation by fast neutrons, and thereby to provide a better understanding of long-term performance of the alloy under fusion conditions. Microstructural evolution of V-4Cr-4Ti, an alloy recently shown to exhibit excellent tensile and creep properties, virtual immunity to irradiation embrittlement, and good resistance to swelling, was characterized after irradiation in a lithium environment in the Fast Flux Test Facility (FFTF) (a sodium-cooled fast reactor located in Richland, Washington) at 420, 520, and 600°C to 24-34 dpa. The primary feature of microstructural evolution during irradiation at 520 and 600°C was high-density formation of ultrafine Ti₅Si₃ precipitates and short dislocations. For irradiation at 420°C, precipitation of Ti₅Si₃ was negligible, and {open_quotes}black-dot{close_quotes} defects and dislocations were observed in significantly higher densities. In spite of their extremely high densities, neither the {open_quotes}black-dot{close_quotes} defects nor Ti₅Si₃ precipitates are overly detrimental to ductility and toughness of the alloy, yet they very effectively suppress irradiation-induced swelling. Therefore, these features, normally observed in V-base alloys containing Ti and Si, are considered stable. Unstable microstructural modifications that are likely to degrade mechanical properties significantly were not observed, e.g., irradiation-induced formation of fine oxides, carbides, nitrides, or Cr-rich clusters. 18 refs., 4 figs., 1 tab.

Report Numbers

E 1.99:anl/fpp/tm--287
E 1.99: iter/us--95/iv-mat-10
iter/us--95/iv-mat-10
anl/fpp/tm--287

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Published through SciTech Connect.
03/01/1995.
"anl/fpp/tm--287"
" iter/us--95/iv-mat-10"
"DE96000984"
Loomis, B.A.; Chung, H.M.; Gazda, J.

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