Detection of hydrogen in neutron-irradiated nickel using positron lifetime spectroscopy

作者：He C; Yoshiie T; Xu Q; Sato K; Peneva S; Troev T D^*

来源：Philosophical Magazine, 2009, 89(14): 1183-1195.

DOI：10.1080/14786430902915404

• Electrical charging
• Hydrogen charging
• Irradiation dose
• Isochronal annealing
• Nano-voids
• Positron annihilation lifetime spectroscopy
• Positron lifetime
• Positron lifetime spectroscopy
• Positron trapping
• Trapping model
• Vacancy cluster
• Vacancy formation

Hydrogen in nano-voids in neutron-irradiated nickel has been detected using positron annihilation lifetime spectroscopy (PALS). As positron lifetime is greatly affected by nano-voids bound with hydrogen, special attention was paid to the analysis. The positron lifetime of neutron-irradiated nickel at higher irradiation doses increased with the dose, which is an indicator for vacancy cluster (nano-void) formation in the lattice. The introduction of hydrogen in well-annealed nickel by electrical charging also resulted in an increase in positron lifetime due to vacancy formation. In neutron-irradiated nickel specimens, hydrogen charging shortened the positron lifetime from 456 to 334 ps (irradiation dose: 3×10-3 dpa). Isochronal annealing behaviour of hydrogen-charged nickel and neutron-irradiated nickel was also studied. Positron trapping rate was calculated using a simple trapping model. Thermal desorption spectroscopy was used for the investigation of hydrogen behaviour in non-irradiated hydrogen-charged nickel.

• 出版日期2009