Thermodynamic database on U-Pu-Zr-Np-Am-Fe alloy system II — Evaluation of Np, Am, and Fe containing systems-

Abstract

A thermodynamic database on a U-Pu-Zr-Np-Am-Fe alloy system is being constructed for developing metallic fuels containing minor actinides. The binary sub-systems containing Np, A m, and Fe were assessed by the CALPHAD method. The phase diagrams of ternary sub-systems were evaluated using both the assessed binary parameters and experimental information for some ternary systems, and then inconsistencies among the binary and ternary phase diagrams were adjusted. The assessed results were summarized as a database file for a thermodynamic calculation program such as Thermo-calc. The available experimental data on the binary, ternary, and quaternary sub-systems in the U-Pu-Zr-Np-Am-Fe system were fitted reasonably using the database.