It has been determined that the use of a poor quality uranium for cores was responsible for non-reproducibility in several series of corrosion samples. A better quality core material will be used for future studies of the effects of outgassing on the corrosion resistance of nickel-plated uranium. Tools for extrusion cladding experiments at BMI are expected to be ready for use in early August. Five nickel-plated steel tubes were internally clad with aluminum by {open_quotes}hot drawing.{close_quotes} Although diffusion zones were formed, the weak bond was parted on cooling due to the differences in the thermal expansion of aluminum and steel. Varying degrees and patterns of segregation have been found in uranium-aluminum castings which were cooled through the liquids-solidus region at different rates. Equipment changes will be made to provide a wider range of cooling rates.

Report on methods for making spherical uranium particles.