Abstract
At very high damage levels in ion irradiated samples, the decrease in effective density of the irradiated material due to void swelling can lead to errors in quantifying swelling. HT9 was pre-implanted with 10 appm He and subjected to a raster-scanned beam with a damage rate of ∼1 × 10-3 dpa/s at 460oC. Voids were characterized from 0 to 1300 nm. Fixed damage rate and fixed depth methods were developed to account for damage-dependent porosity increase and resulting dependence on depth. The fixed depth method was more appropriate as it limits undue effects from the injected interstitial while maintaining a usable void distribution. By keeping the depth fixed and accounting for the change in damage rate due to reduced density, the steady state swelling rate was 10% higher than calculation of swelling from raw data. This method is easily translatable to other materials, ion types and energies and limits the impact of the injected interstitial.
| Original language | English |
|---|---|
| Pages (from-to) | 273-279 |
| Number of pages | 7 |
| Journal | Journal of Nuclear Materials |
| Volume | 477 |
| DOIs | |
| State | Published - Aug 15 2016 |
| Externally published | Yes |
Funding
The authors gratefully acknowledge O. Toader, F. Naab, P.K. Roy and T. Kubley at the Michigan Ion Beam Laboratory for their assistance with irradiations. Research was funded by TerraPower, Inc. through research roundtable agreement DRDA 11-PAF05786 , and the NSF Graduate Research Fellowship Program through award #DGE 1256260 , the University of Michigan College of Engineering for financial support by a roundtable research agreement, and the Michigan Center for Materials Characterization for use of the instruments and staff assistance and NSF grant #DMR-9871177 for support of the JEOL2010F TEM and NSF grant #DMR-0320740 for support of the JEOL 2100F TEM.
Keywords
- Ferritic-martensitic alloys
- Ion irradiation
- Radiation effects
- Void swelling