Abstract
X-ray line broadening in reaction-sintered β-SiC after neutron irradiation in fast breeder reactors at temperatures around 370–620°C to fluences of 3.0×10 24 to 1.7×10 27 n/m 2 (E>0.1 MeV) has been investigated. Broadening occurred after neutron irradiation for all specimens and appreciable broadening was present for specimens irradiated to ≥3.2×10 26 n/m 2 . At neutron fluences below 1.5×10 26 n/m 2 observed broadening could be attributed mainly to the crystallite size effect but a strain contribution was significant above 3.2×10 26 n/m 2 . Fairly large interstitial dislocation loops were observed with TEM in the latter specimens. The calculated crystallite size was in close agreement with the spacing of the dislocation loops.
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