STP570

    Dimensional Stability of Tantalum During Fast Neutron Irradiation

    Published: Jan 1975


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    Abstract

    Upon irradiating tantalum at 500°C in the Dounreay Fast Reactor (DFR), it was found that the dimensions of the metal increased initially, reaching a maximum of approximately 0.2 percent linear at a neutron dose of 1022 neutrons (n)/cm2 (E > 0.11 MeV) (1.5 displacements per atom (dpa) Half-Nelson model (N/2), tantalum). At higher neutron exposure, the dimensions of the specimens gradually decreased. The initial swelling observed has been shown to be due to the formation of a high concentration of small voids. Possible mechanisms to explain the contraction found at the higher levels of irradiation have been considered, and it is concluded that a combination of void-induced swelling and shrinkage due to the formation of the tungsten by transmutation accounts for the observed dimensional behavior of tantalum during irradiation at 500°C.

    Keywords:

    radiation, irradiation, tantalum, fast neutrons, voids, swelling, transmutation effects, tungsten


    Author Information:

    Murgatroyd, RA
    Section leader, research manager, and research physicist, Risley Engineering and Materials Laboratory, United Kingdom Atomic Energy Authority, Lancashire, England

    Bell, IP
    Section leader, research manager, and research physicist, Risley Engineering and Materials Laboratory, United Kingdom Atomic Energy Authority, Lancashire, England

    Bland, JT
    Section leader, research manager, and research physicist, Risley Engineering and Materials Laboratory, United Kingdom Atomic Energy Authority, Lancashire, England


    Paper ID: STP33704S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33704S


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