Title

Effects Of Cr And Ni On Interdiffusion And Reaction Between U And Fe-Cr-Ni Alloys

Abstract

Metallic U-alloy fuel cladded in steel has been examined for high temperature fast reactor technology wherein the fuel cladding chemical interaction is a challenge that requires a fundamental and quantitative understanding. In order to study the fundamental diffusional interactions between U with Fe and the alloying effect of Cr and Ni, solid-to-solid diffusion couples were assembled between pure U and Fe, Fe-15 wt.%Cr or Fe-15 wt.%Cr-15 wt.%Ni alloy, and annealed at high temperature ranging from 580 to 700 °C. The microstructures and concentration profiles that developed from the diffusion anneal were examined by scanning electron microscopy, and X-ray energy dispersive spectroscopy (XEDS), respectively. Thick U6Fe and thin UFe2 phases were observed to develop with solubilities: up to 2.5 at.% Ni in U6(Fe,Ni), up to 20 at.%Cr in U(Fe, Cr)2, and up to 7 at.%Cr and 14 at.% Ni in U(Fe, Cr, Ni)2. The interdiffusion and reactions in the U vs. Fe and U vs. Fe-Cr-Ni exhibited a similar temperature dependence, while the U vs. Fe-Cr diffusion couples, without the presence of Ni, yielded greater activation energy for the growth of intermetallic phases - lower growth rate at lower temperature but higher growth rate at higher temperature. © 2014 Elsevier B.V. All rights reserved.

Publication Date

1-1-2014

Publication Title

Journal of Nuclear Materials

Volume

451

Issue

1-3

Number of Pages

372-378

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jnucmat.2014.04.009

Socpus ID

84901259341 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84901259341

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