Hot deformation of U-9Â wt% Mo

Uranium - 9 wt% molybdenum in the as-extruded condition was deformed in compression in vacuum at temperatures from 850 to 1000 °C and strain rates from 3 × 10−3 to 1 s−1. The strain rate sensitivity (m) was computed and plotted as iso-strain rate sensitivity contour plots. m was around 0.33 at 950-1000 °C at strain rate of 3 × 10−3 s−1. Electron backscatter diffraction showed that at 1000 °C-3 × 10−3 s−1 grains refined, fraction of high angle boundaries increased and the average local misorientation reduced, all indicative of the occurrence of dynamic recrystallization. In comparison, at 950 and 900 °C both the fraction of low angle boundaries and local misorientation was higher. At 1000 °C-3 × 10−3 s−1 the [111] direction was aligned along the compression axis, whereas at lower temperature of 900 °C and 3 × 10−3 s−1 it was the orientations close to [001].