Radiation response of a 9 chromium oxide dispersion strengthened steel to heavy ion irradiation

The Mechanism of Radiation-Induced Nanocluster Evolution in Oxide Dispersion Strengthened and Ferritic-Martensitic Alloys

“…In the initial reconstruction using ICF = 1.65 ( Figure 7.9a), clusters appear to be more horizontally elongated, particularly towards the outer extremes of the represented volume. This result is inconsistent with the observation of TEM-resolution nanoclusters [8] and in the archival literature [12,84,96,110], in which oxide nanoclusters tend to take a spherical shape. On the other hand, clusters in this latter iteration ( Figure 7.9b) appear to be more consistently spherical in shape.…”

“…Finally, it is observed that upon both Fe 2+ and proton irradiation, the average sizes of the oxide nanoclusters appear to asymptotically approach steady-states at doses >3 dpa, consistent with previous modeling [57,74,79] and experimental [5,79,84,107,206] efforts.…”

“…In both cases, average nanocluster size decreases while number density increases with dose above 1 dpa. The inverse relationship between size and number density has been observed elsewhere in literature [72,84,88,101], and is akin to inverse Ostwald ripening, which has been previously described in the context of ion beaminduced size refinement of embedded metallic nanoparticles [58,75,77,78,205], an emerging research area in nanoelectronics. Through inverse Ostwald ripening, smaller nanoclusters nucleate and grow at the expense of larger nanoclusters, due to the competing mechanisms of ballistic dissolution and diffusion-driven nanocluster growth, with the net result being a reduced average cluster size and increased number density.…”

Dependence of Dose and He on Irradiation-Hardening of Fe-Ion Irradiated Fe–8Cr Model Alloy

“…The purpose that the irradiation damage near the 1 µm region was selected for assessment is to minimize the influence of the injected selfions. 10) As mentioned above, irradiation doses at 1 µm depth were used for comparison, and hereafter, all irradiation doses referred to in this report are those at a 1 µm depth.…”

Irradiation Effects in Materials for Nuclear Applications

“…Ion-beam irradiation techniques can be effective in simulating neutron irradiation effects [6,8], fission damage [9] and alpha-decay damage [10] on short laboratory time scales over a large range of experimental conditions in order to develop more detailed scientific understanding and predictive models of the complex evolution microstructure and phase changes under irradiation. The unique effects of ion irradiation and the use of ions to study fast neutron irradiation effects is a critical topic, since development and qualification of new structural materials requires neutron doses that are too high to be obtained in existing nuclear test reactors or spallation neutron sources.…”