CONSTITUTION OF THE URANIUM-RICH U-Nb AND U-Nb-Zr SYSTEMS. Final Report -- Metallurgy Program 3.1.5.

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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 ... continued below

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Pages: 74

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Dwight, A.E. & Mueller, M.H. October 1, 1957.

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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)

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Pages: 74

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  • Other Information: Orig. Receipt Date: 31-DEC-58

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  • Report No.: ANL-5581
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/4317513 | External Link
  • Office of Scientific & Technical Information Report Number: 4317513
  • Archival Resource Key: ark:/67531/metadc1027087

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  • October 1, 1957

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 30, 2017, 2:47 p.m.

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Dwight, A.E. & Mueller, M.H. CONSTITUTION OF THE URANIUM-RICH U-Nb AND U-Nb-Zr SYSTEMS. Final Report -- Metallurgy Program 3.1.5., report, October 1, 1957; Lemont, Illinois. (digital.library.unt.edu/ark:/67531/metadc1027087/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.