Deuterium retention and blistering in tungsten foils
To investigate deuterium retention and the onset of blistering, deuterium was implanted in cold rolled tungsten foils at fluences ranging from 3x1020 to 3x1022 D/m2. Ion energies were 300 eV and 2000 eV in order to be below and above the tungsten theoretical damage energy threshold. While there were energy dependent phenomena, blistering occurs regardless of ion energy. Both plastically and elastically deformed blisters were observed, as manifest in before and after micrographs. The fraction of plastically deformed blisters did not saturate at the fluences used in these studies. However, the size of the largest blister that relaxes during TDS does saturate at ~7 µm. A simple conceptual model is presented that identifies that deuterium released from elastically deformed blisters appears at ~600 K in the thermal desorption spectra, which is consistent with large vacancy clusters.
- Research Organization:
- Idaho National Laboratory, Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1367684
- Report Number(s):
- INL/CON-15-37484
- Country of Publication:
- United States
- Language:
- English
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