Single crystals of the tetragonal fl-phase of uranium were grown in material containing small amounts of chromium by a 7 --> fl phase-transformation method. These crystals could be retained in a metastable condition for long periods following their quenching from normal fl-phase temperatures into water at room temperature. The crystals were found to be ductile, with slip occurring on the {110} type plane in the (001) direction, a slip system analogous to that of fl (tetragonal) tin.
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A. N. Holden (1952) studied this question.