FINAL REPORT ON MISCIBILITY GAPS IN Nb-U AND Nb-U-Zr SYSTEMS Page: 4 of 99
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FULMER RESEARCH INSTITUTE LTD.
Contract No. 62558-(24)-1770. R.126/4/JUNE 1959.
THE MISCIBILITY GAPS IN THE U-Nb AND U-Nb-Zr SYSTHv1
B.S.Berry, M.Sc., Ph.D.
The miscibility gap in the U-Nb system has been established
using metallogragh'c ard X-ray techniques. The monotectoid temperature
is placed at 64.0 - 20C and the composition limits at that temperature
are 65-70 a/o Nb and 17.5 1 a/o Nb, the monotectoid.
The 7000, 6500 and 60000 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
addition of the third element. At 7000C the U-Zr gap is closed by
addition of less than 5 a/o Nb. The behaviour 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 a/o U. The
U-Nb gap has been studied in more detail and is closed by 14 a/o Zr.
To a near approximation the ternary U-Nb gap can be considered to
be bounded by the composition lines 33 a/o U, 14 a/o Zr and about
20 a/o Nb depending on temperature. A notable feature is that at
Nb and Zr compositions approximately corresponding to a line of
minimum lattice distortion, the y phase at 60000 bulges towards the
As a result of the closure of the gaps the y phase is stable
over a large area of the diagram at temperatures down to at least
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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/m1/4/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.