Abstract
The hardness and elastic modulus of monolithic β-SiC and advanced SiC/SiC composites irradiated to He-concentrations of from 1000 to 20 000 at. ppm at a temperature below 100°C were investigated. Changes in the hardness and elastic modulus were correlated with He release behavior and with irradiation-induced microstructural changes and swelling. The hardness and elastic modulus of the irradiated specimens decreased with He concentration. Amorphized regions were observed in the He-irradiated monolithic β-SiC. The mechanical property changes likely were due to irradiation-induced amorphization. By the annealing at 1200°C, nearly full recovery was achieved. He release peaks from the pyrolitic graphite, monolithic SiC, and the SiC/SiC composites at 250, 700, 1000, and 1150°C, were identified. The correlation between the mechanical property and microstructural changes and the He release behavior are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 655-669 |
| Number of pages | 15 |
| Journal | ASTM Special Technical Publication |
| Issue number | 1447 |
| Publication status | Published - 2004 Jan 1 |
| Event | Effects of Radiation on Materials: 21st International Symposium - Tucson, AZ, United States Duration: 2002 Jun 18 → 2002 Jun 20 |
Keywords
- Helium
- Ion irradiation
- Microstructure
- Nano-indentation
- SiC/SiC composite
- Thermal desorption
ASJC Scopus subject areas
- Engineering(all)