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

Shuhei Nogami, Shuhei Miwa, Akira Hasegawa, Katsunori Abe

Research output: Contribution to journalConference articlepeer-review

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 languageEnglish
Pages (from-to)655-669
Number of pages15
JournalASTM Special Technical Publication
Issue number1447
Publication statusPublished - 2004 Jan 1
EventEffects of Radiation on Materials: 21st International Symposium - Tucson, AZ, United States
Duration: 2002 Jun 182002 Jun 20

Keywords

  • Helium
  • Ion irradiation
  • Microstructure
  • Nano-indentation
  • SiC/SiC composite
  • Thermal desorption

ASJC Scopus subject areas

  • Engineering(all)

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