Effect of solute atoms on swelling in Ni alloys and pure Ni under He+ ion irradiation

Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase alloys

“…However, more careful exploration reveals that the insight behind the superficial size effect can be directly related to a more complex effect correlated to the substantial reduction of electron, phonon and magnon mean free paths, which control the complex defect formation energy and migration barrier landscapes17. Furthermore, high-level lattice distortion can not only reduce the defect mobility but also provide effective trapping for the annihilation of freely migrating defects333435. As shown in the schematic image of Fig.…”

Investigation of defect clusters in ion-irradiated Ni and NiCo using diffuse X-ray scattering and electron microscopy

“…1 Recently, the search has been expanded to single-phase concentrated solid solution alloys (SP-CSAs) with multiple principle components, from two to five elements in equal or near-equal concentrations. Experimental studies have shown that certain SP-CSAs are more resistant to radiation damage than pure metals [1,2,3,4], but the detailed reasons why are still not understood. In SP-CSAs, the increased chemical complexity can have many different effects, such as reducing the mean free paths of the energy carriers in the system (phonons, electrons, and magnons) and thus reducing the thermal conductivity, and creating complex energy landscapes for defect formation and migration.…”

Effect of solute elements in Ni alloys on blistering under He+ and D+ ion irradiation

“…In a previous study of microstructural evolution in Ni alloys irradiated with He + ions, the formation and growth of dislocation loops and cavities was examined [17]. The high number densities of dislocation loops, about 1.5 · 10 22 m À3 , were formed in the specimens irradiated to a dose of 1 · 10 19 ions/ m 2 , and the number density of the loops was almost independent of the alloys, except for Ni-Si alloy with negative volume size factor.…”

“…Furthermore, as the implantation proceeds, blisters can be formed by the combination of several larger cavities. The areal number of blisters has a dependence on solute volume size, because the number densities of bubbles have a dependence of solute volume size [17].…”

“…In the lateral model, the gas pressure can serve as only a small nucleating force, while blistering results primarily from an internal lateral stresses in the surface layer. In the previous studies, we reported the development of dislocation loops and cavities formed in Ni alloys irradiated by He + ions up to 4 · 10 20 ions/m 2 [17] and by D + ions at doses up to 4 · 10 20 ions/m 2 [18]. In this study, the irradiations were performed up to a dose of 4 · 10 21 ions/m 2 .…”