Ion irradiation induced disappearance of dislocations in a nickel-based alloy

Comparing Structure-Property Evolution for Pm-Hip and Forged Alloy 625 Irradiated with Neutrons to 1dpa

“…Note, however, that this decrease may not be entirely due to irradiation, but may partly be attributed to thermal annealing over the long duration of the material being held at an elevated temperature. Chen et al additionally observes a decrease in dislocation density for Hastelloy N irradiated with room temperature Xe 20+ ions, which they ascribed to dislocation climb to free surfaces by the absorption of interstitials under irradiation [47]. In the current work, the irradiation temperature, time, and dose may provide sufficient thermal energy and interstitial population to activate migration and climb of network dislocations to free surfaces [46,47].…”

Microstructure Characterization and Small Punch Test Analysis in Nickel-Based Alloy 617 by High Energy Neon Implantation

“…The number density of the inherent dislocations decreased with the increase in the irradiation damage dose. This study attributed the disappearance of the inherent dislocations to the climbing of the dislocations towards the free surface by absorbing the interstitials [10].…”

On the irradiation tolerance of nano-grained Ni–Mo–Cr alloy: 1 MeV He+ irradiation experiment

“…The helium atoms, aggregated at grain boundaries, may yield both kinetic and thermodynamic retardation of the grain grown as well. Interstitials can attribute to the climbing and disappearance of mobile dislocation [43], which result in less density of mobile dislocation density. These microstructural changes can lead to the increase of the hardness.…”