Effects of Cr and Ni on interdiffusion and reaction between U and Fe-Cr-Ni alloys
Abbreviated Journal Title
J. Nucl. Mater.
ZR FUEL; DIFFUSION; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing
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 of Nuclear Materials
"Effects of Cr and Ni on interdiffusion and reaction between U and Fe-Cr-Ni alloys" (2014). Faculty Bibliography 2010s. 5476.