The effects of warm work on some mechanical and fabrication properties of uranium

Uranium plates have been warm rolled at 250°C to reductions of up to 90%. Subsequent tensile tests at ambient temperature have shown a progressive increase in fracture stress and ductility with increased deformation. No evidence of anistropy in tensile properties was observed for material unidirectionally rolled to 80% reduction at 250°C. Cupping tests have been performed on 0.048 in (1.2 mm) uranium sheet warm rolled up to 90% reduction. Tests were made at R.T. and 200° C on both the as-rolled and the annealed conditions. Values of $\text{R}$, the average width strain to thickness strain ratio, were determined during the tensile tests. No correlation was observed between the determined limiting drawing ratios and $\text{R}$ values. However, good cupping behaviour was shown to be a characteristic of material with a high tensile ductility.