Abstract
We present the results of a systematic investigation of neutron-irradiated and thermally annealed Fe-Cu-Ni-P model alloys using positron annihilation spectroscopy (PAS), including lifetime and Doppler broadening techniques, and Rockwell hardness. These alloys were examined in the as-fabricated state, after irradiation at 270° C to 1 × 1019 n.cm-2, and to 8 × 1019 n.cm-2, and after successive post-irradiation isochronal anneals at temperatures from 200 to 600° C. The results can be qualitatively explained by invoking an irradiation-induced microstructure consisting of a combination of small dislocation-type defects or defect clusters (matrix damage) and dense precipitation of fine scale irradiation-induced precipitates. The matrix damage anneals between 350° C and 450° C. The irradiation-induced precipitates also evolve with annealing, but at higher temperatures. The combined effect of high Cu and high Ni concentrations leads to more extensive irradiation-induced precipitation than in cases where either element is missing, Whereas the effect of P is less pronounced. We analyze and compare the results with similar measurements performed on irradiated pressure-vessel steels and with other positron measurements on model alloys, reported in the literature.
Original language | English (US) |
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Pages (from-to) | 247-261 |
Number of pages | 15 |
Journal | Institution of Chemical Engineers Symposium Series |
Issue number | 148 |
State | Published - 2000 |
Event | Hazards XVI Analysing the Past, Planning the Future - Manchester, United Kingdom Duration: Nov 6 2001 → Nov 8 2001 |
All Science Journal Classification (ASJC) codes
- General Chemical Engineering