Mechanical property degradation of high crystalline SiC fiber–reinforced SiC matrix composite neutron irradiated to ~100 displacements per atom
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- National Inst. for Quantum and Radiological Science and Technology, Rokkasho (Japan)
- Stony Brook Univ., NY (United States)
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 paper 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 629 °C to ~100 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 319 °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. Finally, the specimens irradiated at 629 °C showed increased apparent failure strain because the fiber/matrix interphase was weakened by irradiation-induced partial debonding.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); National Inst. for Quantum and Radiological Science and Technology, Rokkasho (Japan)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); Japan Atomic Energy Agency (JAEA)
- Grant/Contract Number:
- AC05-00OR22725; NFE-10-02779
- OSTI ID:
- 1423016
- Journal Information:
- Journal of the European Ceramic Society, Vol. 38, Issue 4; ISSN 0955-2219
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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