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The uranium-rich end of the uranium-zirconium alloy system was reinvestigated. The solubilities of zirconium in alpha and beta uranium were found to be 0.21 wt% at 662 deg C and 0.41 wt% at 693 deg C, respectively. The monotectoid decomposition of gamma 1 at 693 deg C and the eutectoid decomposition of t 662 deg C were confirmed. For alloys containing less than 150 ppm of oxygen by weight, the gamma 1 plus gamma 2 phase region boundaries were located at 4.5 and 22.0 wt% zirconium at the monotectoid temperature. Data are given which indicate that oxygen concentrations ranging from 160 to 355 ppm by weight have a marked effect on phase relations in the area of the gamma 1 plus gamma 2 phase region. (auth).
The uranium-rich end of the uranium-zirconium alloy system was reinvestigated. The solubilities of zirconium in alpha and beta uranium were found to be 0.21 wt% at 662 deg C and 0.41 wt% at 693 deg C, respectively. The monotectoid decomposition of gamma1 at 693 deg C and the eutectoid decomposition of Beta at 662 deg C were confirmed. For alloys containing less than 150 ppm of oxygen by weight, the gamma1plus gamma2 phase region boundaries were located at 4.5 and 22.0 wt% zirconium at the monotectoid temperature. Data are given which indicate that oxygen concentrations ranging from 160 to 355 ppm by weight have a marked effect on phase relations in the area of the gamma1plus gamma2 phase region.
The uranium--niobium binary system exhibits a continuous series of solid solutions above 850 deg C. At lower temperatures a miscibility gap exists, containing a niobium-rich and a uranium-rich body-centered cubic phase. A monotectoid transformation occurs at 634 deg C. The beta-uranium phase is restricted by niobium and disappears at 4 wt.% Nb. Below 634 deg C alpha uranium and the niobium-rich gamma co-exist. The uranium--niobium--zirconium ternary system exhibits a continuous series of solid solutions at high temperatures. Miscibility gaps in the uranium-niobium and uranium--zirconium binary systems close with addition of the third element. Addition of both zirconium and niobium stabilizes the body-centered cubic gamma phase to lower temperatures. The beta-uranium phase is eliminated in ternary alloys of 4 wt.% Nb or more. The delta phase of the uranium-zirconium binary system extends into the ternary system to no more than 10 wt.% Nb. Over the major portion of the uranium-rich corner of the ternary system the equilibrium phases are alpha-U and gamma solid solution. The uranium-niobium binary system is the more dominant of the limiting systems. No new ternary phases were found. The relation of microstructures to irradiation stability is discussed. The relation of lattice strain to limits of solid solubility is also discussed. (auth).
The purpose of this publication is to update and expand the first edition, which was published in 1983, and to report on later advances in uranium ore processing. It includes background information about the principles of the unit operations used in uranium ore processing and summarizes the current state of the art. Extensive references provide sources for specific technological details.