![]() The fraction of ½ loops increases with Cr content after neutron irradiation at 400–450☌ to 15 dpa. Moreover, the proportions of two loop types in Fe-Cr alloys are also affected by the alloy composition. In Fe-Cr alloys, the damage structures as a function of temperature are basically similar to those in pure Fe under Fe + self-ion irradiation, but the loop size in Fe-Cr alloys is much smaller than that in pure Fe. ![]() Ĭomposition can affect the types of loops formed under radiation. Predominant loops in the microstructure of Fe under neutron irradiation around 300☌ have been reported by different researchers. The irradiation in reactors is more complicated than ion irradiation and the proportion of two loop types in Fe in neutron irradiation is not always in agreement with that observed in ion irradiation. In agreement with experimental observation ( Fig. 7.4), their calculations showed that the hexagonal ½ prismatic pure-edge loops are most stable at low temperature pure-edge loops are more stable at higher temperatures. showed that the reduction of shear stiffness constant c′ = ( c 11 − c 12)/2 with increasing temperature has a profound effect on the relative stability of ½ and loops. For example, the theoretical calculations by Dudarev et al. The fractions of the two loop types are probably determined by their temperature-dependent relative stabilities and increased mobility of ½ loops at higher temperatures. ![]() ![]() Fraction of interstitials contained in loops of the two types as a function of temperature in pure Fe. ![]()
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