Microstructure evolution of zircaloy-4 during Ne ion irradiation and annealing: Anin situTEM investigation

Abstract

The microstructural evolution of zircaloy-4 was studied, including the amorphization and recrystallization of Zr(Fe, Cr) 2 precipitates, and the density of dislocations under in situ Ne ion irradiation and post annealing. The results show that irradiation at a relatively high temperature and dose induces the formation of nanocrystals in pre-amorphized Zr(Fe, Cr) 2 precipitates. The recrystallized nanocrystals also have the structure of hcp-Zr(Fe, Cr) 2 . The formation of the nanocrystals is thought to be the consequence of competition between atomistic disordering and the recrystallization of precipitates under ion irradiation. The free energy of the nanocrystal is lower than that of the amorphous state, which is another reason for the recrystallization of the precipitates. With increased annealing temperature, the density of the nanocrystals is increased. The dislocation density sharply decreases with the increase in the annealing temperature, and its size increases.

Effects of helium irradiation dose and temperature on the damage evolution of Ti3SiC2 ceramic*

“…The ion implantation energy was set at 400 keV with the sample normal direction, which would result in a projected range of 1330 nm that was calculated by SRIM code. [33,34] The SRIM code was also used to simulate the He irradiation induced damage and He concentrations in the Ti 3 SiC 2 matrix and the used displacement energies were 25 eV, 25 eV, and 28 eV for Ti, Si, and C, [12,35] respectively. The helium fluence was in a range from 0.5 × 10 17 He + /cm 2 to 2.0 × 10 17 He + /cm 2 , and the helium flux was set at 0.78 × 10 14 He + /(cm 2 •s) to avoid the severe irradiation heating.…”

Effect of Thickness of Molybdenum Nano-Interlayer on Cohesion between Molybdenum/Titanium Multilayer Film and Silicon Substrate

“…Titanium film has the advantages of good hydrogen absorption performance, high thermal stability, and low room temperature equilibrium pressure. Ti film has been used as a metal hydride in the solid phase and has played an important role in the fields of hydrogen storage [35], solar thermal energy storage [36], and nuclear energy storage [4,37,38,39]. It has been reported that the surface morphology and grain size of Ti film on a Mo substrate was severely affected by the heterogeneity of polycrystalline Mo [4,38,40].…”

Structural modification in swift heavy ion irradiated muscovite mica

“…Defects and damage induced by energetic heavy ion irradiation in materials have been an interesting research subject. [5][6][7][8][9] Mica is one of the earliest materials to be used to investigate the irradiation effects of swift heavy ions (SHIs) and highly charged ions (HCIs). Etching tracks on mica induced by charged particles were observed first by Price in the 1960s.…”