Volume 1, Issue 4 (April 2004)

    Mechanical and Structural Property Changes of Monolithic SiC and Advanced SiC/SiC Composites due to Low Temperature He+-Ion Irradiation and Post-Irradiation High Temperature Annealing

    (Received 8 July 2002; accepted 17 April 2003)

    Published Online: 2004

    CODEN: JAIOAD

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    Abstract

    The hardness and elastic modulus of monolithic β-SiC and advanced SiC/SiC composites irradiated to He-concentrations of from 1000 to 20 000 at.ppm at a temperature below 100°C were investigated. Changes in the hardness and elastic modulus were correlated with He release behavior and with irradiation-induced microstructural changes and swelling. The hardness and elastic modulus of the irradiated specimens decreased with He concentration. Amorphized regions were observed in the He-irradiated monolithic β-SiC. The mechanical property changes likely were due to irradiation-induced amorphization. By the annealing at 1200°C, nearly full recovery was achieved. He release peaks from the pyrolitic graphite, monolithic SiC, and the SiC/SiC composites at 250, 700, 1000, and 1150°C, were identified. The correlation between the mechanical property and microstructural changes and the He release behavior are discussed.


    Author Information:

    Nogami, S
    Graduate student, Graduate student, Associate Professor, and Professor, Tohoku University, Sendai,

    Miwa, S
    Graduate student, Graduate student, Associate Professor, and Professor, Tohoku University, Sendai,

    Hasegawa, A
    Graduate student, Graduate student, Associate Professor, and Professor, Tohoku University, Sendai,

    Abe, K
    Graduate student, Graduate student, Associate Professor, and Professor, Tohoku University, Sendai,


    Stock #: JAI11335

    ISSN: 1546-962X

    DOI: 10.1520/JAI11335

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    Author
    Title Mechanical and Structural Property Changes of Monolithic SiC and Advanced SiC/SiC Composites due to Low Temperature He+-Ion Irradiation and Post-Irradiation High Temperature Annealing
    Symposium The Effects of Radiation on Materials: 21st International Symposium, 2002-06-20
    Committee E10