Abstract
The constitution of U-Mo-Nb alloys at 1100°, 1200°, and 1300°C has been studied, mainly by metallographic and X-ray methods, and isothermal sections have been obtained. The decomposition of the body-centred cubic γ-phase in alloys containing 5 at. % Mo and approximately 50 at. % U occurred very slowly at temperatures near the maximum of the miscibility gap. Additions of Mo have been found to decrease the rate of the monotectoid reaction γ1 → α + γ2. Room temperature lattice parameters of quenched homogeneous γ alloys were obtained and a hardness survey of the same alloys showed that a maximum occurred at approximately 50 at. % Nb and a minimum at 85 at. % U. The effect of Mo on the maximum temperature of the miscibility gap has been discussed in terms of the strain energy in the solid solution from which it is formed.
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