Investigations of redistribution of iron in a zirconium alloy due to neutron irradiation
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Investigations of redistribution of iron in a zirconium alloy due to neutron irradiation V. P. Filippov · D. E. Lauer · Yu. A. Lauer · V. I. Petrov · N. I. Kargin · Yu. V. Permyakov
Published online: 14 November 2012 © Springer Science+Business Media Dordrecht 2012
Abstract Data were obtained with the help of 57 Fe Mössbauer spectroscopy about the redistribution of iron atoms between intermetallic precipitates and between precipitates and the solid solution phase in E635-type alloy (Zr-1.2 wt% Sn-0.34 wt% Fe-1.0 wt %Nb-0.03–0.05 wt% O) due to neutron irradiation. Keywords Mossbauer effect · Zirconium alloys · Neutron irradiation
1 Introduction The main problem of nuclear power at the present is the safety of the utilization of nuclear reactor operation with increased duration of their use and, as a result, more profound fuel burnup. In solving this problem it is important to increase the corrosion and radiation resistance of the alloys used in the reactors. As structural elements in the active zone of reactors subjected to thermal neutrons alloys on the basis of zirconium are used. Establishing a relationship between the transformations due to radiation and the initial composition of these alloys gives the possibility to modify existing alloys with a view to improving their basic properties [1, 2]. Important information about the origin and the evolution of secondary phases and about the redistribution in alloys used as matrix elements in the course of thermo-mechanical processing, as well as information about the radiation phase transformations under reactor irradiation can be obtained with the help of Mössbauer spectroscopy, when Mössbauer-active elements (iron and tin) are constituents of the alloys [2].
V. P. Filippov (B) · D. E. Lauer · Yu. A. Lauer · V. I. Petrov · N. I. Kargin National Research Nuclear University “MEPhI”, Moscow, Russia e-mail: [email protected] Yu. V. Permyakov National Research Institute for Physic Technical and Radio Engineering Measurements, Moscow Region, Russia
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2 Experimental set-up and performance The alloy E635 (Zr-1.2 wt% Sn-0.34 wt% Fe.-1.0 wt %Nb-0.03–0.05 wt% O) was selected for the study. Model samples of this alloy containing the Mössbauer isotopes 57 Fe and 119 Sn were produced. The structure of the model alloy and the technique of its preparation were close to those of industrial alloys. The samples were melted using the method of electric-arc melting with nonexpendable electrode in purified argon atmosphere. Annealing of cold rolled samples and quenching of samples were performed as well as a heat treatment. Cold rolling was carried out in several stages to obtain samples with required sizes, textures and structures. At each stage of the cold rolling followed intermediate annealing at a temperature of 600 ± 5 ◦ C for two hours. Modes of intermediate annealing and final annealing were chosen so that the material was completely recrystallized, and at the same time, there were no β-Nb precipitates. Quenching of samples was carried out in gallium
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