Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationCritical assessment of Cr-rich precipitates in neutron-irradiated Fe-12at%Cr
Bergner, F.; Ulbricht, A.; Wagner, A.; Kuksenko, S.; Pareige, C.; Pareige, P.; Malerba, L.
Abstract
The composition of solute-enriched clusters and precipitates formed in Fe-Cr alloys as the result of neutron irradiation is an unsolved issue. It is an important issue for several reasons, namely:
- to reach a complete and consistent description of the nanoscale features derived from the application of necessarily several complementary techniques,
- to correctly design and calibrate models addressing the long-term evolution of the nanoscale features,
- to correctly draw conclusions and configure models on the hardening effect of those nanoscale features.
The basic weakness of SANS is the integrating and one-parametric nature of the composition-related information hidden in the nuclear scattering contrast. Weaknesses of APT are a possible overestimation of Fe in clusters due to trajectory overlap and the insensitivity to vacancies. In the latter respect, PAS data add a value to the comparison. Other factors will be considered as well. The approach is based on the idea that the measured value of the Porod invariant of nuclear SANS can be directly compared with the corresponding quantity calculated solely from the APT data, namely volume fraction and cluster composition. Careful treatment of all potential factors of uncertainty allows the Fe fraction in the clusters to be estimated.
[1] F. Bergner, A. Ulbricht, C. Heintze, Estimation of the solubility limit of Cr in Fe at 300 °C from small-angle neutron scattering in neutron-irradiated Fe–Cr alloys, Scripta Materialia 61 (2009) 1060–1063.
[2] V. Kuksenko, C. Pareige, C. Genevois, F. Cuvilly, M. Roussel, P. Pareige, Effect of neutron-irradiation on the microstructure of a Fe–12at.%Cr alloy, Journal of Nuclear Materials 415 (2011) 61–66.
[3] M. Lambrecht, L. Malerba, Positron annihilation spectroscopy on binary Fe–Cr alloys and ferritic/martensitic steels after neutron irradiation, Acta Materialia 59 (2011) 6547–6555.
Keywords: Fe-Cr alloys; Atom probe tomography; small-angle neutron scattering
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Lecture (Conference)
Joint IAEA - EC Topical meeting on Development of new structural materials for advanced fission and fusion reactor systems, 16.-20.04.2012, JRC Ispra, Italien
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