High Dose Ion Irradiation Testing on Improved HT-9 Alloys
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
HT9 alloys having various nitrogen contents were deformed up to 50% engineering strain by plane strain compression. Dislocation density and characteristics were determined after neutron diffraction using line profile analysis. These samples having low and high nitrogen contents were irradiated at 300 °C up to 23 peak dpa. In this study, effect of plane strain deformation on the radiation response of low and high N HT9 alloys has been investigated using both transmission electron microscopy and nanoindentation. It has been found that compression results in a considerable increase in both dislocation density and edge type dislocations. Both TEM and nano-indentation studies indicate that plane strain deformation results in improved radiation resistance in high N HT9 alloys. It has been also found that further deformation beyond 10% compression does not improve the radiation resistance further. On the other hand, deformation does not have a clear effect on the radiation resistance in the case of low N HT9 alloys. Together with that, ion irradiations at 300 °C results in ~2 times higher hardening in low N alloys compared to high N alloys.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1469494
- Report Number(s):
- LA-UR-18-28529
- Country of Publication:
- United States
- Language:
- English
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