A. Okada et al., MECHANICAL-PROPERTIES OF NEUTRON-IRRADIATED FE-CR AND FE-MN ALLOYS, Science Reports of the Research Institutes, Tohoku University, Series A: Physics, Chemistry, and Metallurgy, 40(1), 1994, pp. 57-62
The mechanical property change due to the evolution of defect structur
es by the irradiation of neutrons was investigated on several Fe-Cr an
d Fe-Mn alloys irradiated in the JMTR and FFTF. With increase in manga
nese levels, dislocation loop density increases much larger than for c
hromium levels in irradiation in the JMTR, while in the FFTF, dislocat
ion density of the Fe-Cr alloys is much larger than in the Fe-Mn alloy
s. This reverse trend is brought about by the saturation in the develo
pment of dislocation loops. The Fe-0.1 and 0.4%Cr whose dislocation de
nsity is much lower than that of the Fe-2%Mn showed the increment in y
ield strength almost the same as that of the Fe-2%Cr and rather larger
than that of the Fe-2%Mn, respectively, in the JMTR. Yield strength i
ncrease without significant variation in the strain hardening exponent
is observed for the Fe-0.1%Cr and Fe-O.1%Mn irradiated in the FFTF an
d very small voids are observed in the Fe-0.1%Mn irradiated in the JMT
R. These results suggest the existence of invisible defect clusters pr
oduced by irradiation.