Comparative study of He bubble formation in nanostructured reduced activation steel and its coarsen-grained counterpart

Defect‐fluorite Gd2Zr2O7 ceramics under helium irradiation: Amorphization, cell volume expansion, and multi‐stage bubble formation

“…For instance, enhanced radiation resistance to amorphization was observed for nanostructured MgGa 2 O 4 , yttria stabilized zirconia (YSZ), and Gd 2 (Ti 0.65 Zr 0.35 ) 2 O 7 powder . Additionally, improved radiation tolerance to swelling and hardening caused by He bubble was also observed for nanostructured steel, tungsten film, and Fe–Cr–Ni alloy . Nevertheless, thus far, the exact role of GB and/or grain size in (a) structural orderness or amorphization, (b) cell volume expansion, and (c) bubble formation induced by He irradiation for the A 2 B 2 O 7 ceramic, remains unclear.…”

Comparison of helium bubble formation in F82H, ODS, SIMP and T91 steels irradiated by Fe and He ions simultaneously*

“…Due to a very low solubility in FM alloys, He atoms easily migrate and accumulate in irradiation-induced vacancy clusters to form nano-scaled bubbles. [11][12][13][14] It has been reported that bubbles are easily formed on grain boundaries at 400 • C and above, resulting in grain boundary helium embrittlement in the long-term survival of materials in nuclear power systems. [15] Below 400 • C, cavities are homogeneously distributed in grains, resulting in grain swelling and hardness.…”