STP1125

    Effect of Helium and dpa's on Tensile Properties of V-5Ti and V-3Ti-1Si

    Published: Jan 1992


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    Abstract

    Specimens of the alloys V-5Ti and V-3Ti -1 Si were irradiated in a mixed-spectrum fission reactor in reactor grade liquid sodium to a fast neutron fluence of 3.8 × 1025 m-2 (E > 0.1 MeV), which corresponds to 6.2 dpa (displacements per atom). Irradiation temperatures were 500,600, and 700°C. Some of the specimens were preinjected with helium to 100 appm at ∼50°C by means of a cyclotron. In addition, part of the specimens were doped with boron-10 to concentrations of 100 and 600 appm. Tension testing at temperatures equal to the irradiation temperatures and at a strain rate of 10-4 s-1 showed an increase in strength and reduced elongation at 500°C and to a lesser extent at 600°C. These changes are caused by displacement damage. Helium, preinjected as well as produced by transmutation of boron-10, did not have a significant influence on the tensile properties. Cavities seen in the irradiated materials at low concentrations were not preferentially located on grain boundaries. There was no apparent deleterious effect of lithium, which is also a transmutation product of boron-10.

    Keywords:

    vanadium alloys, tensile properties, embrittlement, helium, neutron irradiation


    Author Information:

    van Witzenburg, W
    Netherlands Energy Research Foundation, ECN, Petten,

    de Vries, E
    Netherlands Energy Research Foundation, ECN, Petten,


    Paper ID: STP17920S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP17920S


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