Deuterium thermal desorption and re-emission from RAFM steels
Abstract
In the present work, deuterium (D) retention and release during and after ion irradiation of reduced-activation ferritic-marthensitic steels (Eurofer) in comparison with the D retention in pure iron (Fe) was studied. The irradiation was done with 5 keV {{{{D}}}3}+ ions at room temperature at the fluence varied in the range of 1 × 1020-1 × 1022 D m−2. Thermal desorption spectroscopy (TDS) was also performed in situ in 45 min after irradiation. The D release from both materials between the end of irradiation and the start of TDS was very intensive and the integral amount of D measured during outgassing exceeded the D retention measured by TDS. An influence of surface oxidation on the D release due to contact with an environmental air was also demonstrated by comparison of in situ and ex situ TDS. The integral D retention in Eurofer was 1-2 orders of magnitude higher than in pure iron (Fe) due to the initially high concentration of defects in Eurofer. However, pre-annealing of Eurofer at 800 K reduced the defect concentration in Eurofer and, therefore, reduced the difference in the D retention in Fe and Eurofer.
- Publication:
-
Physica Scripta Volume T
- Pub Date:
- December 2017
- DOI:
- 10.1088/1402-4896/aa878d
- Bibcode:
- 2017PhST..170a4016R