Abstract
Alloy 709 (Fe-20Cr-25Ni-1.5Mo-0.26Nb in weight percentages) and its model alloy (Fe-20Cr-25Ni) were subjected to 2 MeV proton irradiation up to 1.5 displacements per atom at ∼670 °C for 90 h. Significant compositional changes were observed in the irradiated zone of both alloys, which was correlated with the radiation-enhanced diffusion. The radiation-enhanced diffusion coefficient of Cr was experimentally determined by fitting the Cr depletion profiles and theoretically analyzed considering vacancy-assisted lattice diffusion, dislocation pipeline diffusion, etc. The estimation of the radiation-enhanced diffusion in the 20Cr-25Ni type alloy in this study is useful in predicting its performance in radiation damage environment. The methodology of investigating radiation-enhanced diffusion adds to the nuclear-material screening capability of ion-irradiation technologies.
| Original language | English |
|---|---|
| Pages (from-to) | 142-146 |
| Number of pages | 5 |
| Journal | Nuclear Materials and Energy |
| Volume | 17 |
| DOIs | |
| State | Published - Dec 2018 |
Funding
This material is based upon work supported by the U.S. Department of Energy , Office of Nuclear Energy, the Nuclear Energy University Program (project no. 14-6346) under contract number DE-AC05-00OR22725 . Drs. Y. Yamamoto and T.-L. Sham are appreciated for providing the A709 material for the testing.
Keywords
- Cr depletion
- Ion irradiation
- Oxidation
- Radiation damage
- Radiation-enhanced diffusion