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Keng, H. T.
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article
Cavity formation in Tyranno-SA SiCf/SiC composite irradiated with multiple-ion beam at elevated temperatures
Abstract
The microstructural evolution of Tyranno-SA SiC<sub>f</sub>/SiC composite irradiated at 800 °C and 1000 °C was investigated by transmission electron microscopy. The irradiation was performed using multiple-ion beam in order to simulate the D-T fusion reactor environment. In this study, we irradiated SiC<sub>f</sub>/SiC composite made from advanced SiC fibers namely, Tyranno-SA, using dual-ion beam (6 MeV Si<sup>3+</sup> and 1.13 MeV He<sup>+</sup>) and triple-ion beam (6 MeV Si<sup>3+</sup>, 800 keV He<sup>+</sup>, and 280 keV H<sup>+</sup>). The effects of He and H atoms on the cavity formation during irradiation are discussed. Cavities were found mainly on the grain boundary of SiC<sub>f</sub>/SiC composite, and cavity coarsening was observed after higher temperature (1000 °C) irradiation. Hydrogen atoms in the SiC<sub>f</sub>/SiC composite will enhance cavity nucleation. © 2007 Elsevier B.V. All rights reserved.