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

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

Research output: Contribution to journalConference article

1 Citation (Scopus)

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 languageEnglish (US)
Pages (from-to)247-261
Number of pages15
JournalInstitution of Chemical Engineers Symposium Series
Issue number148
StatePublished - Dec 1 2000
EventHazards XVI Analysing the Past, Planning the Future - Manchester, United Kingdom
Duration: Nov 6 2001Nov 8 2001

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Positron annihilation
Neutron irradiation
Irradiation
Annealing
Precipitates
Positron annihilation spectroscopy
Defects
Doppler effect
Positrons
Steel structures
Hot Temperature
Neutrons
Hardness
Temperature
Microstructure

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Cite this

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title = "Effects of neutron irradiation and thermal annealing on model alloys using positron annihilation techniques",
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.",
author = "Cumblidge, {Stephen E.} and Catchen, {Gary L.} and Motta, {Arthur Thompson} and Gerhard Brauer and J{\"u}rgen B{\"o}hmert",
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Effects of neutron irradiation and thermal annealing on model alloys using positron annihilation techniques. / Cumblidge, Stephen E.; Catchen, Gary L.; Motta, Arthur Thompson; Brauer, Gerhard; Böhmert, Jürgen.

In: Institution of Chemical Engineers Symposium Series, No. 148, 01.12.2000, p. 247-261.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Effects of neutron irradiation and thermal annealing on model alloys using positron annihilation techniques

AU - Cumblidge, Stephen E.

AU - Catchen, Gary L.

AU - Motta, Arthur Thompson

AU - Brauer, Gerhard

AU - Böhmert, Jürgen

PY - 2000/12/1

Y1 - 2000/12/1

N2 - 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.

AB - 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.

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