STP955

    Influence of Grain and Subgrain Boundaries on Void Formation and Growth in Aluminum Irradiated with Fast Neutrons

    Published: Jan 1987


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    Abstract

    High-purity aluminum was irradiated at 120°C to fast neutron fluences between 2 × 1021 and 5 × 1024 n/m2. Variations in void density and void size in the vicinity of grain and subgrain boundaries have been analyzed. The results document that vacancy accumulation is enhanced in a wide zone up to 15 μm from grain boundaries. The magnitude of the enhanced vacancy accumulation varies as a function of distance from the grain boundary. The presence of subgrain boundaries enhances the vacancy accumulation within the subgrain, and the vacancy accumulation varies markedly as a function of subgrain size. The results are discussed in terms of the consequences of an initial vacancy concentration gradient near grain boundaries on further vacancy accumulation. The maintenance and evolution of vacancy supersaturation gradients are considered in terms of transport and screening of interstitials during vacancy accumulation in the peak zone.

    Keywords:

    radiation, neutron irradiation, voids, dislocation, grain boundaries, peak zone, interstitial loss, diffusion, channelling, recoil atoms, focussing, enhanced vacancy accumulation, swelling, aluminum


    Author Information:

    Horsewell, A
    Research scientist and senior research scientist, Metallurgy Department, Risø National Laboratory, Roskilde,

    Singh, BN
    Research scientist and senior research scientist, Metallurgy Department, Risø National Laboratory, Roskilde,


    Paper ID: STP33819S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33819S


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