Abstracts and Available Papers Presented at the 2004 International RERTR Meeting
REACTION LAYER BETWEEN U-7WT%Mo AND Al ALLOYS IN
CHEMICAL DIFFUSION COUPLES.
Mirandou M., Granovsky M., Ortiz M., Balart S., Aricó
S. and Gribaudo L CNEA Avda. Gral Paz 1499, B1650KNA, San Martin.
Several failures in U-Mo dispersion fuel plates like
pillowing and large porosities have been reported during
irradiation experiments. These failures have been
assigned to the formation of a large (U-Mo)/Al
interaction product under high operating conditions. The
modification of the matrix by alloying Al to change the
interaction layer and improve its irradiation behavior,
has been proposed. This paper reports diffusion
experiments performed between U-7wt%Mo and various Al
alloys containing Mg and / or Si. By the use of Optical
Microscopy, SEM and X-Ray diffraction, it was found that
with a concentration of 5.2wt% or 7.1 wt%Si the
interaction layer is constituted mainly by (U,Mo)(Si,Al)3
and no (U,Mo)Al4 is detected. As part of the studies of
properties of the U-Mo alloys the time for isothermal
transformation start at different temperatures of the
phase is being evaluated for the present U-7wt%Mo alloy.
These results are used to plan the future diffusion
program that will include diffusion under irradiation at
CNEA RA3 reactor.