TY - JOUR
T1 - Evidence for neutron irradiation-induced metallic precipitates in model alloys and pressure-vessel weld steel
AU - Cumblidge, Stephen E.
AU - Motta, Arthur T.
AU - Catchen, Gary L.
AU - Brauer, Gerhard
AU - Böhmert, Jürgen
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/8/1
Y1 - 2003/8/1
N2 - We have used positron Doppler-broadening spectroscopy to examine a series of neutron-irradiated model alloys (1 × 1023 n/m2, E > 0.5 MeV) and 73W-weld steel (to 1.8 × 1023 n/m2, E > 1 MeV. The copper, nickel and phosphorus content of the model alloys was systematically varied. The samples were examined in the as-irradiated state and after post-irradiation isochronal anneals to temperature up to 600 °C. By following the S and W parameters, and especially by plotting the results in (S,W) space, we can infer that the damage is a combination of irradiation-induced metallic precipitates and vacancy-type defect clusters. Samples with either high Cu or with a combination of high Ni and medium Cu (and the pressure-vessel weld steel) showed evidence for both irradiation-induced metallic precipitation, and vacancy-type clusters, while samples without either high Ni or high Cu showed predominantly evidence of annihilations in vacancy-type clusters. These results are discussed in terms of embrittlement models.
AB - We have used positron Doppler-broadening spectroscopy to examine a series of neutron-irradiated model alloys (1 × 1023 n/m2, E > 0.5 MeV) and 73W-weld steel (to 1.8 × 1023 n/m2, E > 1 MeV. The copper, nickel and phosphorus content of the model alloys was systematically varied. The samples were examined in the as-irradiated state and after post-irradiation isochronal anneals to temperature up to 600 °C. By following the S and W parameters, and especially by plotting the results in (S,W) space, we can infer that the damage is a combination of irradiation-induced metallic precipitates and vacancy-type defect clusters. Samples with either high Cu or with a combination of high Ni and medium Cu (and the pressure-vessel weld steel) showed evidence for both irradiation-induced metallic precipitation, and vacancy-type clusters, while samples without either high Ni or high Cu showed predominantly evidence of annihilations in vacancy-type clusters. These results are discussed in terms of embrittlement models.
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U2 - 10.1016/S0022-3115(03)00190-9
DO - 10.1016/S0022-3115(03)00190-9
M3 - Article
AN - SCOPUS:0038107983
VL - 320
SP - 245
EP - 257
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 3
ER -