Evaluation of fiber/matrix interfacial strength of neutron irradiated SiC/SiC composites using hysteresis loop analysis of tensile test

Kazumi Ozawa, Tatsuya Hinoki, Takashi Nozawa, Yutai Katoh, Yuichi Maki, Sosuke Kondo, Shinichiro Ikeda, Akira Kohyama

Research output: Contribution to journalArticle

12 Citations (Scopus)

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 languageEnglish
Pages (from-to)207-210
Number of pages4
JournalMaterials Transactions
Volume47
Issue number1
DOIs
Publication statusPublished - 2006 Jan 1
Externally publishedYes

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

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