Volume 5, Issue 10 (November 2008)

    Investigation of Irradiation Hardening and Embrittlement of Zr-2.5%Nb Alloy with High-Energy (e,γ)-Beams

    (Received 13 November 2007; accepted 31 July 2008)

    Published Online: 2008

    CODEN: JAIOAD

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    Abstract

    The paper researches into the effect of the initial structural condition of Zr-2.5%Nb alloy, which is widely used in reactor engineering to manufacture reactor core components (mainly as a structural material for RBMK and CANDU pressure tubes), and of irradiation conditions (temperature, applied stress) on irradiation hardening and embrittlement. The reactor damage of Zr-2.5%Nb alloy was modeled with a method of high-energy 225 MeV (e,γ)-beam irradiation, which allows samples to be irradiated under strictly controlled stress conditions. The research has been carried out on Zr-2.5%Nb alloy exposed to four types of thermo-mechanical treatment. It has been found that the alloy is susceptible to intensive irradiation embrittlement irrespective of its initial condition, and the intensity of Zr-2.5%Nb irradiation hardening greatly depends on pre-treatment. In contrast to other conditions, Zr-2.5%Nb alloy is virtually not susceptible to irradiation hardening after high-speed high-frequency (SHF) heating, quenching, and subsequent annealing in the high-temperature range of the α-region, during which the double-phase α+βNb state with high dispersion of βNb (∼1023 m−3) precipitates develops. The obtained results are in good agreement with the post-reactor irradiation tensile test results. The study demonstrates the efficiency of high-energy (e,γ)-beam irradiation for investigating the irradiation hardening and embrittlement of zirconium alloys.


    Author Information:

    Parkhomenko, O.
    Leading Research Scientist Institute of Solid-State Physics, Materials Science and Technologies, National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Grytsyna, V.
    Head of the laboratory, “Nuclear Fuel Cycle” Science and Technology Establishment National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Chernyayeva, T.
    Senior researcher, “Nuclear Fuel Cycle” Science and Technology Establishment National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Azhazha, V.
    Director, Institute of Solid-State Physics, Materials Science and Technologies, National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Krasnorutskyy, V.
    Director, “Nuclear Fuel Cycle” Science and Technology Establishment National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Ozhigov, L.
    Head of the laboratory, Institute of Solid-State Physics, Materials Science And Technologies, National Science Center Kharkov Institute of Physics and Technology, Kharkov,

    Savchenko, V.
    Research Scientist, Institute of Solid-State Physics, Materials Science And Technologies, National Science Center Kharkov Institute of Physics and Technology, Kharkov,


    Stock #: JAI101494

    ISSN: 1546-962X

    DOI: 10.1520/JAI101494

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    Author
    Title Investigation of Irradiation Hardening and Embrittlement of Zr-2.5%Nb Alloy with High-Energy (e,γ)-Beams
    Symposium 15th International Symposium on Zirconium in the Nuclear Industry, 2007-06-28
    Committee B10