Microstructural defects in SiC neutron irradiated at very high temperatures

S. Kondo, Y. Katoh, L. L. Snead

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59 Citations (Scopus)

Abstract

Microstructures in high purity β-SiC irradiated with fast neutrons (up to ∼9.6 × 1025 n/m2, in HFIR) at very high temperatures (1130, 1300, and 1460 °C) were studied by transmission electron microscopy. Cavities and dislocation loops were generally observed in irradiated samples. The cavities were preferentially formed at grown-in stacking faults, and were spherical in shape below 1300 °C and mainly faceted with {1 1 1} planes at 1460 °C. Estimated volume fractions of observed cavities were much smaller than macroscopic densitometer swelling recently reported, which implies other defects cause the swelling in this temperature regime. Larger Frank loops (>25 nm in radius) formed at 1460 °C were identified as interstitial type using the inside/outside method. Unfaulting of the loops was not observed or was very rare. Rapid loop growth and density decrease were observed in the temperature range of 1300-1460 °C concurrently with the rapid cavity growth. The limited growth rate of dense loops at lower temperature was discussed in terms of high sink density estimated from a grain-boundary-loop-denuded zone formed at 1130 °C.

Original languageEnglish
Pages (from-to)160-169
Number of pages10
JournalJournal of Nuclear Materials
Volume382
Issue number2-3
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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