STP1502

    Application of Digital Marker Extensometry to Determine the True Stress-Strain Behavior of Irradiated Metals and Alloys

    Published: Jan 2009


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    Abstract

    To study the mechanisms of deformation hardening and flow localization of radioactive materials, a noncontact “digital marker extensometry” technique has been employed. It allows researchers to easily define plasticity parameters and true stresses in experiments where highly radioactive miniature specimens are used. The engineering and “true stress-true local strain” relationships of irradiated metal polycrystals during plastic flow and hardening have been investigated experimentally after irradiation in two reactors in Kazakhstan. The true curves were obtained for copper, nickel, iron, molybdenum, as well as for the Russian stainless steels 08Cr16Ni11Mo3 and 12Cr18Ni10Ti. Describing these curves using the equation σi = σ0 + kεi, demonstrates that the concept of ultimate stress in highly irradiated materials is an artifact arising from flow localization and is not fully informative of the operating hardening mechanisms.

    Keywords:

    metals, alloys, neutron irradiation, extensometry, flow localization, tensile properties


    Author Information:

    Gusev, M. N.
    Institute of Nuclear Physics, Almaty,

    Maksimkin, O. P.
    Institute of Nuclear Physics, Almaty,

    Osipov, I. S.
    Institute of Nuclear Physics, Almaty,

    Garner, F. A.
    Pacific Northwest National Laboratory, Richland, Washington


    Paper ID: STP48725S

    Committee/Subcommittee: E10.01

    DOI: 10.1520/STP48725S


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