STP529

    Attrition and Stabilization of Void Nuclei: Critical Nucleus Size

    Published: Jan 1973


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    Abstract

    Computer experiments were performed on the effect of impurity atoms, hydrostatic pressure, uniaxial tension, and radiation attrition on void nucleus stability in alpha-iron. The critical void nucleus size was found to be a 44-vacancy octahedral (bipyramidal) void with (110) facets. Helium atoms, oversize metallic impurity atoms, and carbon-vacancy complexes served as strong centers for heterogeneous nucleation of voids. Carbon-vacancy complexes at void apexes and corners inhibited thermal dissociation. The amount and tenacity of vacancy trapping by carbon atoms increased with hydrostatic pressure up to 110 kilobars.

    Keywords:

    irradiation, neutron irradiation, radiation effects fluence, fast neutrons, irradiation damage, computer experiments, swelling, point defects, crystal defects, voids, interstitials, stresses, metals, gases, impurities, stainless steels, fast reactors (nuclear), damage saturation


    Author Information:

    Beeler, JR
    Professor, materials engineering and nuclear engineering, and research assistant, North Carolina State University, Raleigh, N.C

    Beeler, MF
    Professor, materials engineering and nuclear engineering, and research assistant, North Carolina State University, Raleigh, N.C


    Paper ID: STP35455S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP35455S


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