SYMPOSIA PAPER Published: 01 January 2004

Mechanical and Structural Property Changes of Monolithic SiC and Advanced SiC/SiC Composites due to Low Temperature He -Ion Irradiation and Post-Irradiation High Temperature Annealing


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.

Author Information

Nogami, S
Tohoku University, Sendai, Japan
Miwa, S
Tohoku University, Sendai, Japan
Hasegawa, A
Tohoku University, Sendai, Japan
Abe, K
Tohoku University, Sendai, Japan
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E10
Pages: 655–669
DOI: 10.1520/STP11264S
ISBN-EB: 978-0-8031-5494-0
ISBN-13: 978-0-8031-3477-5