In situ study of the homogenization kinetics of a U-Mo alloy by neutron diffraction at high temperature
A worldwide program encourages the development of low enriched, high density U-Mo/Al dispersed fuel in order to convert research reactors cores currently working with highly enriched U3Si2 or UAlx fuel.In this high density U-Mo/Al fuel material, the fissile part usually consists of U-Mo spherical particles with diameter ranging from 20 up to about 150 µm, which are usually produced by an atomization process. During the solidification of the first solid phase in the molten metal, a U poor (i.e. Mo enriched) phase is first produced rejecting a U rich (Mo poor) liquid phase. High resolution neutron diffraction measurements have also confirmed the presence of volumes with different Mo contents as shown by the splitting of the gamma-U-Mo Bragg lines. The zones with low Mo content are strongly suspected to exhibit a higher swelling at low irradiation dose. The main goal of the proposed experiment is thus to characterize the Mo homogenization kinetics as a function of temperature by performing in situ neutron diffraction on U-Mo atomized powders during thermal treatments at 3 different temperatures (800°C, 900°C, 1000°C).
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KLOSEK Vincent; CALZAVARA Yoann; PALANCHER Herve and SUARD Emmanuelle. (2017). In situ study of the homogenization kinetics of a U-Mo alloy by neutron diffraction at high temperature. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-118
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