Abstract
The results of a transmission electron microscopy study of the defect structure in iron neutron-irradiated to low fluences (⩽ 1 dpa) at temperatures of 455–1013 K are presented. The dislocation microstructures coarsen with increasing irradiation temperature from decorated dislocations, through clusters of dislocation loops, to near-edge, interstitial dislocation loops with b = a 〈100〉, and network segments. Significant cavity formation occurred only at 548–723 K, with homogeneous distributions found only at 623 and 673 K. The maximum swelling of 0.07% occurred at 673 K. Large cavities had a truncated octahedral shape with {111} facets and {100} truncations. Damage halos were observed around boron-containing precipitates. The effects of interstitial impurities on microstructural development and the differences in the observed microstructures compared to those in refractory bcc metals are discussed.
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