Steady-state dynamical phase diagram calculation of U-Nb binary system under irradiation: Ballistic effect

A kinetic model involved in ballistic effects has been used for studying the steady-state configuration under irradiation, with considering the irradiation-enhanced diffusion. By applying this model to all the solid phases, the dynamical phase diagram of U-Nb system under irradiation is calculated and critically compared with the assessed thermodynamic equilibrium phase diagram. The calculated results indicate that the irradiation has little effect on the phase relationships of U-Nb system at high temperatures. However, it leads to the close of the miscibility gap of U-Nb system at relatively low temperatures. Meanwhile, the high-temperature stable γ(U,Nb) phase is stabilized by the irradiation, which is in agreement with the available experimental results.