Phase relations in the Fe-Pu-U ternary system

An isothermal section of the Fe-Pu-U ternary system at 650 degreesC was ass essed in a previous study. In the present study, the predictions of the pha se relations in the Fe-Pu-U system to higher and lower temperatures were pe rformed by applying the interaction parameters determined at 650 degreesC, Differential thermal analysis (DTA) for the Fe-Pu-U alloys was also carried out to confirm the phase relations in the temperature region of 500 to 800 degreesC. Both results agreed well. On the basis of the predicted ternary phase diagram, the phase relations for a region surrounded by Fe2Pu, Fe2U, U, and Pu were described by a reaction scheme and a projection of the liqui dus surface.