A study of neutron irradiation damage in iron by electron-transmission microscopy

Transmission electron microscope study of fusion-environment radiation damage in iron and iron-chromium alloys

“…The threshold fluence for the formation of observable damage in this study was between 5 x 10^2 and 1 X 1023 neutrons m"^ (E > 1 Me¥) for irradiation temperatures of '-eO^C (333 K). Similar damage and fluence dependence were also reported by Bryner [28] . A subsequent Investigation by Eyre and Bartlett [29] demonstrated that the "black-spot" damage consisted of point defect clusters.…”

The Effect of Neutron Irradiation on Remanent Magnetization in Multidomain Iron and Kamacite

“…Movement of the point defects to dislocations or their aggregation into small dislocation loops would result in annealing of the induced anisotropy and a return of magnetic properties to pre-irradiation values. A change in the distribution of point defects from uniform dispersal to aggregation into small dislocation loops would also be in agreement with electron-transmission microscopy observations of lattice damage in irradiated metals by DowNEY andEYRE (1965) andBRYNER (1966).…”

MAPPING FLOW LOCALIZATION PROCESSES IN DEFORMATION OF IRRADIATED REACTOR STRUCTURAL ALLOYS - FINAL REPORT. Nuclear Energy Research Initiative Program No. MSF99-0072. Period: August 1999 through September 2002. (ORNL/TM-2003/63)

“…These small clusters have been detected by other techniques of atom probe microscopy, small angle neutron scattering, and positron annihilation. Also, coarsened clusters can be seen in TEM if the material is post-irradiation annealed to a temperature of 300-400 o C [34][35][36] or if the material is irradiated at 290 o C [37,38]. At such higher temperatures thermal diffusion processes are enhanced and are sufficient to enable the clusters to grow to visible sizes.…”