Abstract
Small defects observed in 40 keV Cu +, 40 keV Fe + and fission neutron irradiated SUS316, ferritic Fe-9Cr and ferrite-martensitic JFMS have been studied using a weak beam TEM analysis, stereo electron microscopy, and a “2 1 2 - dimensions ” TEM technique. The observed defects are 90% vacancy type in ion irradiated steels, and 50% vacancy type in fission neutron irradiated steels. Defects produced by cascade damage grow in size as a result of the overlap of these defects and newly generated cascade damage. The results of the ion irradiation of three kinds of steels can be used to predict the approximate relation among the defect densities in these steels irradiated with neutrons. Depth profiles of the observed defects in prethinned steels are, however, found to depend on the neutron dose. Defect yields in Fe-9Cr and JFMS are lower than that of SUS316, and the difference in the temperature dependence of defect yield in these steels can be explained using the difference of vacancy migration energy.
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