Neutron Irradiation Damage and Hardness Anisotropy in Molybdenum Single Crystals

    Published: Jan 1994

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    This paper describes the anisotropy of Knoop hardness in olybdenum single crystals neutron-irradiated at high temperatures in the Fast Experimental Reactor (JOYO) and the Fast Flux Test Facility (FFTF/MOTA). Knoop hardness, measured on the (001) surface of the specimen, showed a maximum in the [100] indentation direction and a minimum in the [110] direction. This anisotropic behavior in body-centered-cubic metals remained the same after neutron irradiation, though the average hardness increased. The degree of relative anisotropy, i.e. the hardness ratio between [100] and [110] directions, however, decreased with increasing neutron fluence. The hardness anisotropy was analyzed using the average Taylor factor.


    molybdenum, neutron irradiation, microhardness, anisotropy, mechanical property, Knoop hardness

    Author Information:

    Abe, K
    Professor, Tohoku University, Sendai,

    Kanzaki, M
    Graduate course student, Tohoku University, Sendai,

    Satou, M
    Research Scientist, Tohoku University, Sendai,

    Arai, K
    Graduate course student, Tohoku University, Sendai,

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP23929S

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