| Abstract Scope |
In molten salt reactor systems, tellurium, a fission product transported in molten salts, may react with Ni–Cr structural alloys and form tellurides. The resulting phase evolution can involve coexisting solution phases and stoichiometric compounds, where elemental diffusion, phase-specific compositional redistribution, and compound formation are coupled. Existing reaction-extent formulations were developed for compound formation coupled with a single solution phase. The present model introduces local composition relaxation for an additional solution phase in the Ni–Cr–Te system. The model includes two solution phases and two stoichiometric tellurides, conserves the total Ni, Cr, and Te contents, and uses CALPHAD thermodynamics to calculate chemical driving forces. Simulations for selected Ni–Cr–Te compositions examine the evolution of competing tellurides and the associated redistribution of Ni, Cr, and Te. |