b'Nuclear Science User Facilities Figure 3. Atom probe tomographyAPT results show that neutronfrequency distribution analysis, results (a) Cr elemental frequencyirradiation to 3 dpa induces signifi- shown in Figure. 3a. The G-phase distribution in ferrite phases andcant spinodal decomposition andprecipitates (Mn-Ni-Si clusters) were (b) spinodal decomposition of Cr in irradiated ferrite phases with orG-phase precipitation, as shown inquantified using a widely accepted without prior thermal aging.Figures 3 and 4 for the materialsmaximum-separation method (MSM) without and with prior thermal[89]. The measured number density aging. By using the Cr-Cr radialand mean size are (1.48 0.17) x distribution function, the spinodal1024 m-3/1.06 0.05 nm and (1.44 decomposition wavelength and0.06) x 1024m-3/1.06 0.03 nm amplitude were quantified as 13.2for the 3 dpa irradiated unaged and nm/16.72 at.%, and 12.4 nm/16.993 dpa irradiated aged conditions, at.% for the 3 dpa irradiated- respectively. The G-phase precipitates unaged and 3 dpa irradiated-agedhave a nearly identical volumetric specimens, respectively. Thermalfraction of around 0.75% in the aging prior to neutron irradiationferrite phase in those two specimens.has nearly no impact on the level ofDiscussionspinodal decomposition in the ferriteThe in-situ X-ray tensile testing clearly beams completely overshadowedshowed the hardening of ferrite by neutron irradiation. This factphase upon thermal aging, and it confirmed using the Cr elementalis anticipated that the ductility of 50'