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2016 | OriginalPaper | Chapter

5. RR in Fe and FeCr Alloys

Author : Begoña Gómez-Ferrer

Published in: Resistivity Recovery in Fe and FeCr alloys

Publisher: Springer International Publishing

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Abstract

The objective of the present work was to provide complete and high-temperature resolution RR curves on samples with Cr contents of 5, 10, and 15 %, respectively, with a well-controlled composition and microstructure and improvement with respect to the data provided by Benkaddour et al. [1]. In this case, the irradiations have been performed with protons instead that with electrons, and thus, the type of created damage must be evaluated. Also as a consequence of the considerations which have been made in Chap. 2 concerning the SRO and its effects enhanced by defect migration, an improved methodology to measure RR—which has been described in Sect. 2.5—has been performed on Fe–Cr alloys in order to check the importance of such effects on the RR experiments. As a consequence from the connection between the interpretations of the results in each section with the next one, here both the results and the discussion are presented in one common chapter. This chapter is divided into five main sections. Sect. 5.1 of this chapter is devoted to the characterization of the residual resistivity of studied Fe–Cr alloys and the evaluation of the effects of Cr addition to pure Fe in terms of residual resistivity. Next, the damage produced by electrons, neutrons, and protons is discussed in Sect. 5.2. Also, a detailed study made based on modeling tools of our 5 MeV proton irradiations is presented. The third part, Sect. 5.3, provides a description of specimen characteristics and irradiation runs, the experimental measurements of resistivity values of studied specimens along low-T Irr. This section includes the analysis of effects of irradiation as a function of C_Cr. Sect. 5.4 includes RR curve and RR spectrum from a proton-irradiated pure Fe specimen. Their analysis is very useful given that it allows comparisons with many experimental results found in the literature and that has been described and critically reviewed in Sect. 4.2 and help to identify the temperature intervals at which the processes should be occurring in proton-irradiated samples. Finally, the fifth part, 5.5, is the most important, where RR results of concentrated Fe–Cr alloys will be provided and discussed. An initial analysis on the results obtained under the classical RR method put in evidence the important SRO effects. Then, RR results obtained with the proposed improved RR method, its discussion, and some complementary Mössbauer measurements are given.

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Although the effects of injected interstitials must be taken into account given their impact in both swelling [45] and Cr precipitation [46]

In metals, where electrical conductivity is high, the ionization produced by irradiation is very rapidly neutralized by the conduction electrons which have a relaxation time for charge redistribution extremely short ~10⁻¹⁹ s.

This value is being recently revised and lower value of 30 eV is being proposed by ab-initio calculations [47]

As N and C are both light elements, its influence as impurities in FeCr alloys is assumed to be very similar.

At the solubility limit at low temperatures, the Fe–Cr alloys decompose into two phases. The phase α contains the C_Cr of the solubility limit, whereas the phase α’ has much higher C_Cr. This a consequence of the miscibility gap found in the Fe–Cr phase diagram at low temperatures.

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Title: RR in Fe and FeCr Alloys
Author: Begoña Gómez-Ferrer
Publisher: Springer International Publishing
Book: Resistivity Recovery in Fe and FeCr alloys
Print ISBN: 978-3-319-38856-4

Electronic ISBN: 978-3-319-38857-1

Copyright Year: 2016
DOI: https://doi.org/10.1007/978-3-319-38857-1_5

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