37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Niagara Falls
Session Title:
2A3 - Reactor and Radiation Physics (III)

P. Changizian (Queen’s University)
C. Lu (University of Michigan)
Z. Yao (Queen’s University)


This study investigates the effect of helium implantation on mechanical properties of irradiated X-750 Ni-based superalloy used as a spacer material in CANDU reactor. For this purpose, two different irradiation procedures have been carried out including single self-ion (Ni+) irradiation at 400°C and the implantation of 5000 appm (atomic parts per million) helium followed by Ni ion irradiation at 400°C up to 1 dpa (displacement per atom). Nano-indentation tests were conducted at room temperature at different depths on both irradiated and un-irradiated materials. The results show that pre-helium implantation enhances the irradiation-induced hardening. The cross-sectional TEM (transmission electron microscopy) observations revealed that generating a high density of small cavities and promoting the formation of larger Frank loops are the main reasons of significant hardening of helium implanted material.

Individual Conference-Paper Copies (Electronic Where Available):

  • For CNS members, the first 5 copies per calendar year are free, and additional copies are $10 each.
  • For non-members, the price is $25 for the first Conference-paper copy in a request, and $10 each for additional copies of papers in the same conference and in the same request.
  • Contact the CNS office to order reprints.