STP1447

    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

    Published: Jan 2004


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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.

    Keywords:

    SiC/SiC composite, helium, ion irradiation, nano-indentation, microstructure, thermal desorption


    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,


    Paper ID: STP11264S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP11264S


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