Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898473 | Journal of the European Ceramic Society | 2018 | 8 Pages |
Abstract
For the development of silicon carbide (SiC) materials for next-generation nuclear structural applications, degradation of material properties under intense neutron irradiation is a critical feasibility issue. This study evaluated the mechanical properties and microstructure of a chemical vapor infiltrated SiC matrix composite, reinforced with a multi-layer SiC/pyrolytic carbon-coated Hi-NicalonTM Type S SiC fiber, following neutron irradiation at 319 and 629â¯Â°C to â¼100 displacements per atom. Both the proportional limit stress and ultimate flexural strength were significantly degraded as a result of irradiation at both temperatures. After irradiation at 319â¯Â°C, the quasi-ductile fracture behavior of the nonirradiated composite became brittle, a result that was explained by a loss of functionality of the fiber/matrix interface associated with the disappearance of the interphase due to irradiation. The specimens irradiated at 629â¯Â°C showed increased apparent failure strain because the fiber/matrix interphase was weakened by irradiation-induced partial debonding.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Takaaki Koyanagi, Takashi Nozawa, Yutai Katoh, Lance L. Snead,