In-situ field--ion microscope study of the recovery behavior of ion-irradiated tungsten and tungsten alloys [electronic resource].
- Ithaca, N.Y. : Cornell University. Department of Materials Science and Engineering, 1979.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 40 : digital, PDF file
- Additional Creators:
- Cornell University. Department of Materials Science and Engineering
United States. Department of Energy. Office of Scientific and Technical Information
- Five grades of W specimens with different purity levels were irradiated to a dose of typicaly 5 x 10/sup 12/ ion cm/sup -2/ at 18/sup 0/K. Examination with a low-temperature field-ion microscope showed the isochronal-annealing spectra of the specimens to result from a large self-interstitial atom (SIA) flux at approx. 38/sup 0/K, followed by significant SIA flux from approx. 50 to 80/sup 0/K and a small amount of additional recovery up to 120/sup 0/K. The spectra for these specimens were essentially identical between 18 and 120/sup 0/K. High-purity W specimens doped with C showed only a small reduction in the amount of recovery observed for the long-range migration peak at 38/sup 0/K. The isochronal recovery spectra for W-Re specimens were different from the isochronal recovery spectra of pure W specimens. For both alloys the recovery of the Stage I long-range migration peak at 38/sup 0/K was strongly suppressed. All recovery from 18 to 120/sup 0/K was virtually eliminated indicating that during the long-range migration substage at 38/sup 0/K tightly-bound, immobile SIA-Re complexes were formed that suppressed the SIA--SIA reaction. This effect was observed at high Re atom concentrations. The lack of any significant differences for the annealing spectra of the five purity-levels of undoped W and the appearance of impurity effects in the extremely concentrated alloys indicated that the early Stage II recovery observed in the annealing spectra of self-ion irradiated high-purity W was intrinsic. Because of the highly inhomogeneous SIA distribution of the W/sup +/ ion damage, the SIA--SIA interaction during Stage I long-range migration at 38/sup 0/K appeared to be the dominant trapping mechanism. The early Stage II SIA recovery was attributed to the migration or dissolution of these SIA clusters.
- Published through SciTech Connect.
Wilson, K.L.; Baskes, M.I.; Seidman, D.N.
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