Mechanical Properties of Cubic Silicon Carbide after Neutron Irradiation at Elevated Temperatures

    Volume 2, Issue 8 (September 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 22 June 2005

    Page Count: 13


    Katoh, Y
    Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN

    Snead, LL
    Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN

    (Received 16 April 2004; accepted 30 January 2005)

    Abstract

    Mechanical properties of high-purity polycrystalline cubic SiC was characterized after neutron irradiation. Bar samples were irradiated in target position capsules in the High Flux Isotope Reactor (HFIR, Oak Ridge, Tennessee) to nominal fluence levels up to 7.7 dpa at temperatures of 300, 500, and 800°C. A decrease in Young's modulus was observed after irradiation, and its irradiation temperature dependence qualitatively agreed with the calculated modulus change due to point defect swelling. Irradiation caused a significant modification of statistical flexural strength but caused only minor increase in nano-indentation hardness. The irradiation effect on fracture initiation through an enhanced cleavage resistance likely is primarily responsible for the major change in flexural strength properties.


    Paper ID: JAI12377

    DOI: 10.1520/JAI12377

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    Title Mechanical Properties of Cubic Silicon Carbide after Neutron Irradiation at Elevated Temperatures
    Symposium Effects of Radiation on Materials: 22nd International Symposium, 2004-06-10
    Committee E10