Abstract
Advanced SiC/SiC composites composed of highly-crystalline and near-stoichiometric SiC fibers, SiC matrix by CVI method, and PyC interphase were irradiated up to 1.0 × 10 25 n/m 2 (E > 0.1 MeV, ∼1 dpa) at 1273K. Unload/reload cyclic tensile test and hysteresis loop analysis were carried out in order to identify neutron irradiation effects on interfacial properties of advanced SiC/SiC. The composites exhibited good irradiation resistance in ultimate tensile strength (∼10% increase), but there were slight reduction of elastic modulus and proportional limit stress (PLS) (∼10%). Wider hysteresis loops and lower gradient of the curves beyond PLS from the strain-stress curves, and longer pullouts of fiber from the SEM observation were observed, which imply weaker F/M interactions after neutron irradiation. From the hysteresis loop analysis, degradation of interfacial sliding stress and negative increment of misfit stress after neutron irradiation were obtained.
Original language | English |
---|---|
Pages (from-to) | 207-210 |
Number of pages | 4 |
Journal | Materials Transactions |
Volume | 47 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2006 Jan |
Externally published | Yes |
Keywords
- Ceramic matrix composites
- Hysteresis loop analysis
- Neutron irradiation
- SiC/SiC
- Silicon carbide
- Tensile properties
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering