Abstract
Over the past decade, significant progress has been made in the development of silicon carbide (SiC)
composites, composed of near-stoichiometric SiC fibers embedded in a crystalline SiC matrix, to the point
that such materials can now be considered nuclear grade. Recent neutron irradiation studies of
Hi-Nicalon Type S SiC composites showed excellent radiation response at damage levels of 30–40 dpa
at temperatures of 300–800 C. However, more recent studies of these same fiber composites irradiated
to damage levels of >70 dpa at similar temperatures showed a marked decrease in ultimate flexural
strength, particularly at 300 C. Here, electron microscopy is used to analyze the microstructural
evolution of these irradiated composites in order to investigate the cause of the degradation. While
minimal changes were observed in Hi-Nicalon Type S SiC composites irradiated at 800 C, substantial
microstructural evolution is observed in those irradiated at 300 C. Specifically, carbonaceous particles
in the fibers grew by 25% compared to the virgin case, and severe cracking occurred at interphase layers.
