Abstracts and Available Papers Presented at the 2002 International RERTR Meeting
U-Mo ALLOY POWDER OBTAINED THROUGH SELECTIVE
HYDRIDING: PARTICLE SIZE CONTROL
S.N. Balart, P. Bruzzoni y M.S. Granovsky.
Av. del Libertador
8250, 1429 Buenos Aires, Argentina.
methods to obtain U-Mo alloy powder for high-density fuel elements have been
successfully tested by different authors.
One of these methods is the selective hydriding of the a
In the HSa method, a key step is the partial decomposition of the g
phase(retained by quenching) to a phase and an enriched g phase or U2Mo. This transformation starts mainly at grain
boundaries. Subsequent hydrogenation of
this material leads to selective hydriding of the a phase, embrittlement and
intergranular fracture. According to
this picture, the particle size of the final product should be related to the g
grain size of the starting alloy.
feasibility of controlling the particle size of the product by changing the g
grain size of the starting alloy is currently investigated. In this work an U-7 wt% Mo alloy was subjected to
various heat treatments in
order to obtain different grain sizes.
The results on the powder particle size distribution after applying the
HSa method to these samples show that there is a strong correlation between
the original g
grain size and the particle size distribution of the powder.