Abstract
Depleted uranium alloys containing 0.75 wt% titanium were prepared by γ-quenching followed by aging with five different aging time and temperature conditions. The microstructural properties of the alloys were studied by using the neutron powder diffraction method and the small angle neutron scattering (SANS) method. The Rietveld refinement of the powder diffraction patterns for the uranium phase indicated two distinct aging stages for the alloy. In the first aging stage, the distortion of the b-axis length and the unit cell volume of the uranium phase increased with aging, and reached a peak value at an aging condition between 500°C/100 s and 550°C/1000 s. In the second aging stage, the above parameters decreased with increasing aging. The entire profiles of the diffraction patterns of the aged samples (two phases) were analyzed with multiphase Rietveld refinement to determine the amounts of U2Ti (“δ-phase”) as a function of aging treatment. The particle size distributions of the δ-phase precipitates were determined from the SANS data. The observed indentation hardness versus aging conditions closely paralleled the aging dependencies of the lattice distortion of the uranium phase and the number of the precipitates.
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