Dose dependence of defect accumulation in neutron irradiated copper and iron

Effects of Room Temperature Heavy-Ion Irradiation on Magnetic and Electrical Properties of a Single Crystalline Iron Thin Film

“…[14][15][16][17] The formation of small dislocation loops was confirmed by TEM observation after the irradiation (0.3-0.4 dpa) of neutrons and 590 MeV protons at 320 K. 14) In both irradiations, the size and density of the loops were 3-5 nm and to the order of 10 21 -10 22 m À3 respectively. Although the loop character was not analyzed using TEM, it would probably be an interstitial type.…”

“…M. Eldrup et al systematically investigated the defects of pure iron neutron-irradiated at 320 K using PAS, TEM and a conductivity measurement. 15) At a dose of 0.23 dpa, subnanometer vacancy clusters (roughly 10 vacancies) with a density to the order of 10 24 m À3 were observed in addition to the formation of interstitial clusters. Electrical conductivity decreased by about 15% at room temperature, which corresponds to the increase of resistivity by 1:8 Â 10 À8 m. Since the density of vacancy clusters was much higher than that of interstitial clusters, the increase in resistivity is mainly due to the formation of vacancy clusters.…”

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)

“…A cluster exponent of ½ would make ∆YS = α(φt) 1/4 It is recognized that all of these relationships will fail at higher doses due to saturation in formation of clusters caused by overlapping of displacement cascades and by absorption of freely migrating point defects at existing clusters. For copper [44], such saturation is estimated to occur at a dose of about 0.1 dpa [44] and it is seen at about 0.1 dpa [45,46]. For iron, cluster saturation is deduced to occur at 0.01-0.04 dpa [47,48] but is not seen until at least 0.5 dpa [46].…”

“…For copper [44], such saturation is estimated to occur at a dose of about 0.1 dpa [44] and it is seen at about 0.1 dpa [45,46]. For iron, cluster saturation is deduced to occur at 0.01-0.04 dpa [47,48] but is not seen until at least 0.5 dpa [46].…”

Analysis of Obstacle Hardening Models Using Dislocation Dynamics: Application to Irradiation-Induced Defects

“…The physical realization of these larger defects is material dependent. For example, in FCC copper, stacking fault tetrahedra, voids, and SIA loops are experimentally observed, [2][3][4][5] whereas in BCC a-iron, spherical voids, and SIA loops are observed, [5][6][7] and in HCP zirconium, only void and SIA loops are seen. [8] Defect morphology and spatial correlation are also dependent on other factors such as temperature, displacements per atom (DPA), and DPA rate.…”