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    Effects of Interstitial Solutes on the Microstructures of Self-Ion Irradiated Vanadium


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    Vanadium and vanadium containing 0.1 percent carbon, 0.4 percent carbon, 1.0 percent nitrogen, and 1.0 percent oxygen were irradiated with 3-MeV 51V+ ions in the temperature range 650 to 880°C (1202 to 1616°F) to a dose level of ∼20 dpa. The results show that nitrogen is most effective in controlling the void swelling. Carbon and oxygen also suppress the swelling considerably when compared with unalloyed vanadium. Except for vanadium-1.0 percent nitrogen, all compositions exhibit a fine platelet precipitate with {012} habit at 650°C (1202°F). In the case of vanadium-carbon alloys, this phase persisted even at higher temperatures. Vanadium and vanadium-1.0 percent oxygen showed fine precipitation on dislocations and void surfaces at 880°C (1616°F). Vanadium-0.1 percent carbon exhibited a metastable {013} carbide precipitate at 880°C (1616°F), whereas vanadium-0.4 percent carbon showed equilibrium V2C phase with some {012} precipitates. This {012} precipitation was irradiation induced and was dependent upon the carbon concentration. Vanadium-1.0 percent nitrogen did not show any evidence of precipitation over the entire temperature range.


    radiation wall materials, body-centered-cubic metals, interstitial solutes, radiation effects, swelling, voids, dislocations, metastable precipitation

    Author Information:

    Agarwal, SC
    Argonne National Laboratory, Argonne, Ill.

    Potter, DI
    Argonne National Laboratory, Argonne, Ill.

    Taylor, A
    Argonne National Laboratory, Argonne, Ill.

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38056S