Effects of neutron irradiation and thermal annealing on model alloys using positron annihilation techniques

Stephen E. Cumblidge, Gary L. Catchen, Arthur T. Motta, Gerhard Brauer, Jürgen Böhmert

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


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 languageEnglish (US)
Pages (from-to)247-261
Number of pages15
JournalInstitution of Chemical Engineers Symposium Series
Issue number148
StatePublished - 2000
EventHazards XVI Analysing the Past, Planning the Future - Manchester, United Kingdom
Duration: Nov 6 2001Nov 8 2001

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering


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