Abstract
Alloys of U with 20 wt % Pu and various additions of a group of fission product elements termed “fissium” were investigated and their transformations, structures and melting points are reported. Additions of fissium, which was composed of the elements Ru, Mo, Pd, Te, Rh, Nb and Zr stabilized the gamma and beta uranium phases down to 555° C. At high fissium contents the beta transformation was entirely suppressed. Alpha uranium, gamma-prime and zeta were the stable phases at temperatures below 400° C. A primary phase “theta” with an unknown crystal structure was present in all the compositions studied. Lattice constants are given for alpha and gamma uranium and some intermetallic phases.
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