Title

Effects of Cr and Ni on interdiffusion and reaction between U and Fe-Cr-Ni alloys

Authors

Authors

K. Huang; Y. Park; L. Zhou; K. R. Coffey; Y. H. Sohn; B. H. Sencer;J. R. Kennedy

Comments

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Abbreviated Journal Title

J. Nucl. Mater.

Keywords

ZR FUEL; DIFFUSION; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing

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 degrees 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 U-6(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. (C) 2014 Elsevier B.V. All rights reserved.

Journal Title

Journal of Nuclear Materials

Volume

451

Issue/Number

1-3

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

372

Last Page

378

WOS Identifier

WOS:000338618600048

ISSN

0022-3115

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