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  indentation direction and a minimum in the  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  and  directions, however, decreased with increasing neutron fluence. The hardness anisotropy was analyzed using the average Taylor factor.
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