FINAL REPORT ON MISCIBILITY GAPS IN Nb-U AND Nb-U-Zr SYSTEMS

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The miscibility gap in the U-Nb system has been established using metallographic and x-ray techniques. The monotectoid temperature is placed at 640 deg plus or minus 2 deg C and the composition limits at that temperature are 65 to 70 at.% Nb and 17.5 plus or minus 1 at.% Hb. The 700, 650, and 600 deg C isothermal sections of the U-Nb- Zr system have also been investigated. Each of the miscibility gaps present in the limiting binary sections was found to be closed by additions of the third element. At 700 deg C the U- Zr gap is closed ... continued below

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Medium: P; Size: Pages: 94

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Creator: Unknown. January 1, 1959.

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Description

The miscibility gap in the U-Nb system has been established using metallographic and x-ray techniques. The monotectoid temperature is placed at 640 deg plus or minus 2 deg C and the composition limits at that temperature are 65 to 70 at.% Nb and 17.5 plus or minus 1 at.% Hb. The 700, 650, and 600 deg C isothermal sections of the U-Nb- Zr system have also been investigated. Each of the miscibility gaps present in the limiting binary sections was found to be closed by additions of the third element. At 700 deg C the U- Zr gap is closed by addition of less than 5 at.% Nb. The behavior of the Zr-Nb gap is less certain owing to the sluggish reactions close to this binary system but the gap appears to be closed by about 15 at.% U. The U-Nb gap has been studied in more detail and is closed by 14 at.% Zr. To a near approxiation the teniary U-Nb gap can be considered to be bounded by the composition lines 33 at.% U, 14 at.% Zr, and about 20 at.% Nb depending on temperature. A notable feature is that at Nb and Zr compositions approximately corresponding to a line of minimum lattice distortion, the gamma phase at 600 deg C bulges toward the U corner. As a result of the closure of the gaps the gamma phase is stable over a large area of the diagram at temperatures down to at least 600 deg C. (auth)

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Medium: P; Size: Pages: 94

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  • Other Information: Orig. Receipt Date: 31-DEC-60

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  • Report No.: NP-8237
  • Report No.: R-126/4
  • Grant Number: 62558-(24)-1770
  • DOI: 10.2172/4207229 | External Link
  • Office of Scientific & Technical Information Report Number: 4207229
  • Archival Resource Key: ark:/67531/metadc877724

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  • January 1, 1959

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 8, 2016, 2:46 p.m.

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FINAL REPORT ON MISCIBILITY GAPS IN Nb-U AND Nb-U-Zr SYSTEMS, report, January 1, 1959; United States. (digital.library.unt.edu/ark:/67531/metadc877724/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.